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- Abstract：In order to test the vitality of sweet corn seed quickly and efficiently,several physical characteristics (red,green,blue,hues,saturation,brightness,light,a, b,width,length and projected area) of a certain cultivar of sweet corn,Jinfei,were obtained in batch and quickly went through image recognition technology (Seed Identification software).Each seed viability was confirmed through single seed germination test,and a model for seed viability discrimination of Jinfei was established by applying principle component analysis,artificial neural network and binary logistic regression.The results showed that:1) a,b,saturation,width and projection area all had significant correlation with the seed vigor and relatively high variation coefficient.For the seeds with a ≤ 3,the germination percentage was increased from 72.7% to 77.6%,and the selected rate reached to 79.4%.For the seeds with projection area ≤ 77.31 mm2,the germination percentage can be increased to 73.7% and the selected rate reached 87.6%.2) Based on 13 standardized physical indicators,artificial neural network model with double hidden layers (training set:testing set=6:4) possessed an overall predicting accuracy at 74.2%,germination percentage also reached to 76.9%,with 93.8% quality seed selection.3) The germination percentage of binary logistic regression was 74.5%,but the model stability of Artificial Neural Network model was better than binary logistic regression.These results would provide references for further research and implementation of quality seed sorting technology.Keywords：sweet corn;machine vision technology;principal component analysis;Artificial Neural Network;Binary Logic Regression0|7|8<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study aimed at exploring the changes of nutrient,protein and amino acid content in the grains of barley and spring wheat under different water treatments to provide theoretical basis for the drought resistance and quality breeding of the wheat family crops in the Qinghai-Tibet Plateau.The experiment was conducted by taking Qingchun 41 (wheat) and Kunlun 14 (barley) as study materials.Three treatments were designed including sufficient treatment (C1),mild deficit treatment (C2) and severe deficit treatment (C3).Randomized block was design to study the effects of different water treatments on the NPK,protein and amino acid contents in its kernels.The results showed that:Compared with C2,the total NPK contents,protein,essential amino acids,non-essential amino acids and amino acids of two wheat crops increased in C3 treatment.However,there were some differences in the patterns of water deficit on N,P and K contend,protein and amino acid between wheat and barley grains.The changes of total N,P and K,protein,essential amino acids,nonessential amino acids and total amino acids in wheat grain showed decreased first and then increased.The contents of nitrogen and potassium,protein,essential amino acids,nonessential amino acids and total amino acids increased,and increased more significantly when under the severe water deficit.The effects of water deficit on the content of N,P and K,protein essential amino acid and non-essential amino acid in grain of wheat family crops had some differences.Compared with sufficient water treatment,under water deficit treatment,the nutrient content of barley grains,protein and its components increased significantly while the index of wheat grains decreased first and then increased in the underwater deficit treatment,suggesting that the resistance of wheat to water deficit was lower.Keywords：water deficit;nutrient accumulation;amino acid;protein2|8|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Six agronomic traits in the elongation stage including the number of green leaves,total leaf number,green leaf area,stalk length,stalk diameter and stalk weight of the fifteen clones of BC1 progeny from GT05-164×GXASF108-2-28 and GT05-3279×GXASF108-2-28 and their parents,were analyzed in this study.The results showed that the number of green leaves,stalk length,stalk diameter and stalk weight for the progeny were all superior to both or one of parents.The green leaf area had the largest genetic variation,and displayed significant positive correlations with stalk length and stalk weight,which could be used as an indirect index for yield analysis.Moreover,the cluster analysis identified 4 groups.12-A6-1,12-A6-3,12-A6-5,12-A6-25 and 12-A6-27 in the first class had large green leaf area and could be taken as the key materials for further research and utilization.The results of this study provided references for the evaluation and screening of the progeny of intergeneric hybrid (Erianthus arundinaceus×Saccharum spontaneum).1|7|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：DREB2As is a group of transcription factors that activate the expression of drought-responsive genes.To enhance the drought tolerance of peanut plant, AlDREB2A was transferred into peanut through Agrobacterium transformation in this study.Factors influencing transformation efficiency (dosages of tobacco extracts,ultrasonic treatment time and concentration of antibiotics) were optimized.The results showed that:After drought stress treatment with polyethylene glycol,the relative water content and proline content in transgenic peanuts were notablely higher than those in non-transgenic peanuts,and the content of malondialdehyde was lower than that of non-transgenic peanuts;The wilting degree of transgenic lines was less than that of non-transgenic peanuts.This study demonstrated that the transgenic peanuts had higher drought tolerance ability than non-transgenic peanuts.3|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to make better use of the apricot germplasm resources introduced from Hungary,this study was focused on the effective flower rate,natural fruit setting rate,self-setting fruit rate,pollen tube growth and other characteristics of two high quality apricot strain Hybrid18/79 and Hybrid10/10 introduced from Hungary.Beizhaihongxing and Golden Sun apricot were used as control.The S genotype was assayed and determined by S-allele-specific PCR.The results showed that:The self-pollination fruit setting rates of Hybrid18/79,Hybrid10/10 and Beizhaihongxing were 18.05%,2.27% and 1.68% respectively.Hybrid18/79 was a self-compatibility strain.Both Beizhaihongxing and Hybrid10/10 were self-incompatibility cultivars and strains.After self-pollinating,the pollen tube growth of Hybrid 10/10 was blocked in style,and the pollen tube expanded to the top and stopped growing.In comparison,the tube of the self-compatibility cultivar Golden Sun apricot had no growth blocking,which could successfully enter embryo sac for fertilization.The S-genotypes of Hybrid18/79,Hybrid10/10 and Beizhaihongxing were identified as Su1Su2, S16S16 and S30Su1 respectively.The results of sequence alignment showed that Su1 and Su2 were new genes.One S gene (Su1) of Beizhaihongxing apricot was the same as the Su1 in Hybrid18/79.The two discovered genes had been registered in GenBank with accession numbers MF685202 and MF685203.Keywords：apricotgermplasm;self-incompatibility;S genotype;Hungary2|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the mechanism on giant cell induction at nematodes feeding site during the formation of galls caused by the root knot nematode (Meloidogyne icognita) in Xinjiang wild myrobalan (Prunus sogdiana),the cutting seedlings of myrobalans were inoculated with M.incognita to identify the level of resistance to nematode,and paraffin sections were made to demonstrate the development of galls and phenotype of endoreduplication.The change of associative enzyme ability and differential expression of CCS52A gene were also analyzed.The results showed that:Only round 25% of tested Xinjiang wild myrobalans presented the resistant capacities.The enzyme ability of POD、SOD and GLU reached peaks at 6 dpi (day past inoculation),which apparently were higher than those of susceptible ones.But the peak of CHI activity appeared at 8 dpi,and was higher than in susceptible lines until 14dpi.Histological observation discovered that a number of nucleus were observed to undergo mitosis in giant cells at 5 dpi,and were subsequently assembling from 7 to 21 dpi.The results suggested that nuclear division in the absence of cytokinesis occurred at 5 to 7 dpi in gall,and the process of endoreduplication mainly took place from 7 dpi to 21 dpi.The expression of CCS52A gene began to rise at 7 dpi and continued to 21 dpi,which was consistent with the occurrence of endoreduplication.And its expression in the giant cells was also confirmed by in situ hybridization.These results illustrated that the CCS52A gene is involved in the development of giant cells to help the successful establishment of feeding sites and its up-regulation contributes to the establishment of nematode feeding sites.2|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to understand the codon usage characteristics of TBX3 gene in horse and provide information on selection of best host receptor and appropriate heterologous expression systems.The codon usage of horse TBX3 gene (GenBank accession no.XM_014742147.1) was assessed with online CHIPS,CUSP and Codon W,and was subsequently compared with 10 related genes involved in horse body growth and morphology formation,model organism genomes,and TBX3 gene in other species.The result revealed that:Most of horse TBX3 genes were bias toward the synonymous codons with G and C at the third codon position,and 19 biased codons (RSCU>1.20) were observed,among which GCC,CTG,AGC and GTG exhibited stronger bias (RSCU>2.00);Most of the 10 selected horse genes biased toward the synonymous codons with G and C at the third codon position and 20 biased codons were found.Among which,CTG showed stronger bias;The evaluation of TBX3 gene codon bias among 30 species indicated that TBX3 gene expression level was general and most of these genes were bias toward the synonymous codons with G and C at the third codon position;RSCU value and CDS sequence based clustering analysis found that domestic horses belonging to perissodactyla,cats and polar bears belonging to carnivore were clustered together,indicating evolutionary tree was closer to the actual system classification of the 30 species;In view of the features of codon usage frequency,mice were considered to be more suitable to serve as the host of exogenous genes expression for TBX3 gene.This study provided a theoretical basis for selecting appropriate receptor animals in genetic improvement and screening the best heterologous expression systems for TBX3 gene as well as its expression improvement.Keywords：horse;TBX;3 gene;codon bias;clustering analysis9|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Bedding recovery unit (BRU) has been applied in some dairy farms,which not only reduces the cost of cattle farms,but also turns wastes into measure,thus improves the utilization efficiency of the solid cow manure resources.In order to understand the technical features and environmental impacts of the BRU system,the material characteristics and greenhouse gas emissions during system operation are investigated in this study.The results show that:The core of the BRU system,dry drum,doesn't change the physical and chemical properties of the manure,and with the increasing of discharge flow,the temperature in dry drum and the emission rates of CO2,CH4 and N2O are significantly reduced,while its relative humidity is significantly increased;After the process of solid-liquid separation and BRU system,one ton manure releases CO2,CH4 and N2O in the levels of 2.15-5.04 kg,1.95-7.25 g and 27.09-58.11 mg,respectively.The total greenhouse gas emission of the BRU system is 3.60 kg CO2 equivalent per ton fresh manure.Based on the result of the life cycle assessment,it is concluded that the environmental impact contribution of the BRU system is only 9% of the aerobic composting system,which means the BRU system is more environment-friendly than the aerobic composting system.Keywords：dairy farm;bedding recovery unit;greenhouse gas;environmental impact;life cycle assessment6|9|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to investigate the resistance to antibacterial drugs and the drug-resistant genes of Salmonella isolates from pets in Urumqi,Xinjiang.Thirty-nine Salmonella isolates' antimicrobial susceptibility were tested by agar dilution method.PCR method was used to detect the resistance genes of PMQR,β-lactamase,aminoglycoside,tetracycline,amide alcohol and peptide.The results showed that:The isolates were 97.4% (38/39) resistant to ciprofloxacin and amoxicillin;The isolates were 100% resistant to norfloxacin,enrofloxacin,ampicillin,kanamycin,tetracycline and florfenicol;The isolates were 100% sensitive to ceftiofur,apramycin,amikacin and gentamicin.The main resistance profile was CIP-NOF-ENR-AML-AMP-KANA-TE-FFC.The blaTEM and blaOXA were the mainly detected genes of beta lactamases.The qnrS,oqxA,oqxB and aac (6')-Ib-cr were the mainly detected factors of PMQR.The aadA2 and ant (3")-Ia were the mainly detected genes of aminoglycoside.The tetB and floR were mainly detected genes of tetracycline and amide alcohol.The coexistence of multiple genes was blaTEM+blaOXA+qnrS+oqxA+oqxB+aac (6')-Ib-cr+aadA2+ant(3")-Ia+tetB+floR. Therefore,to avoid no drug available for treatment human illness situation occurs in future,animal specific sensitive medicines should be used to in pets not drugs for human,especially not new drugs.Keywords：pet;Salmonella;resistance;resistance genes;detection9|13|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to explore the connotation and approach of the trinity protection of cultivated land,documentation and comprehensive analysis method were adopted.In retrospect,effects and problems of cultivated land protection occurring in the past decade were summarized and analyzed.Based on the knowledge of system theory and combining previous research results,comprehensive analysis was carried out by integrating the features,functions,processes and states of farmland ecosystem with trinity protection of cultivated land.The results show that:1) The concept of trinity comprehensive protection of quantity,quality,and ecology of cultivated land is hierarchical and systematic,involving a series of activities to maintain and improve the production,ecological and life functions of farmland ecosystems and guarantee regional and national food security,ecological security,and social stability.To ensure the quantity of cultivated land,cultivated land users should be supervised,encouraged,and guided with intensive and green land use strategies.Therefore,the stabilities of cultivated land elements and ecological environment in farmland ecosystem could be kept an excellent condition.2) The trinity protective approach includes setting up protection concept from farmland ecosystem perspective.This approach also takes partition grading protection,perfects cultivated land ecological compensation system and regulates the behavior of farmers in the process of cultivated land use and protection,which means the quantity,quality and ecological states of cultivated land are monitored in real time.Consequently,a classified and comprehensive cultivated land protection pattern is brought into effect.This study would provide references for the formulation and implementation of cultivated land protection policy in the new period.Keywords：cultivated land;cultivated land protection;trinity;farmland ecosystem;sustainable utilization;protection approach34|36|35<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Understanding the vegetation dynamics and its relationship with influencing factors is of great importance to enhancing the ecological environment quality of the Zhangjiakou-Chengde Region.This study explored the spatio-temporal evolution characteristics of climate factors and Normalized Difference Vegetation Index (NDVI),and then analyzed the correlation between them from 2000 to 2014.The results indicated that:1) The vegetation index in the Zhangjiakou-Chengde Region showed an increasing trend with a considerable inter-annual fluctuation as well as significant seasonal and spatial variation.2) The photosynthetic effective radiation and temperature experienced a decreasing trend in the past fifteen years,while the precipitation increased with obvious seasonal variation.3) At the seasonal scale,the correlation between NDVI and precipitation was the most remarkable in summer,however,NDVI is more closely related with the temperature and photosynthetically active radiation in winter.At the inter-annual scale,NDVI had a low correlation with photosynthetically active radiation,but it had a significant positive correlation with precipitation and a significant negative correlation with temperature.4) There were obvious differences among correlation degrees between NDVI of different vegetation types and the climate factors,while as for the same vegetation type,there is the highest correlation between precipitation and NDVI.All these results of this study can provide important reference information for responding the climate change and improving the ecological environment quality in the Zhangjiakou-Chengde Region.Keywords：NDVI;climatic impact;spatio-temporal variation12|14|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to study the geological background of the growth of high-quality roses in Miaofeng Mountain in Beijing,field investigation and sampling test methods were used in this study to analysis its geological background from four aspects,e.g.soil geological background,geological tectonic background,landforms conditions and geochemical background.The zoning map of rose planting in Mentougou District was then obtained with the ArcGIS software.The results show that:1) Rose growing soil of Miaofeng Mountain derived from Andesitic Volcanic Rocks in Jurassic strata.2) The tectonic movement resulted in the uplift of Miaofeng Mountain into a syncline mountain tectonic landform.At the same time,mountain microclimate formed in this mountain area.A large number of faults formed by tectonic movements accelerated the weathering of rocks,which had important influence on the formation and development of Miaofeng Mountain soil and its property.3) The pedestal rock of Miaofeng Mountain was rich in Ca,Mg,Fe,B,Zn,and Mn,which had greatly affected the fine quality of roses.4) From the perspective of agricultural geological background in Miaofeng Mountain,the rose planting area was divided in Mentougou District.The valley region,which is similar to Miaofeng Mountain,is expected to become the planting area of roses.Its soils were derived from Andesitic Volcaniclastic Rocks with a certain elevation.The conclusion is that under similar climate conditions,the quality of high-quality rose in Miaofeng Mountain is mainly affected by the agricultural geological background.Keywords：rose;agricultural geological background10|12|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to improve the mechanization transplanting level of sweet potato in major sweet potato producing areas and solve outstanding issues currently existed in mechanization transplanting of sweet potato including not enough ridging height,ridge density difference,low reliability,wheels going in ditches easy to cause damage and break ridges,low operating efficiency,etc.By means of combination of agricultural machinery and agronomy,a new type 1GQL-2 sweet potato transplanting compound operation machine matched with high-powered tractor of 55.13-80.85 kW was developed.The results show that:Compared with traditional segment operating machine,the machine can complete two ridges of rotary tillage,ridging,furrowing,shaping,covering film,suppressing and covering soil once,owning fewer farm working times and resulting in saving energy and reducing consumption,lightening roller compaction of farmland.This machine can solve effectively the traditional bottleneck problem,such as ridging height not enough,the ridge body of poor compactness,easy to collapse,destroyed ridge body side,non-standard river ridge distance easy to break,easy to wrinkle,not enough height and thickness,low reliability and low efficiency of the farm work problems.In conclusion,the preferred parameters are:the moving speed was 0.3 m/s,height of part of pressing film was 360 mm,and the rotary tillage depth was 400 mm.This study would provide theoretical basis and references for the innovation development and optimization of sweet potato ridging and laminating machine.Keywords：agricultural machinery;sweet potato;ridging;coverage film;design3|9|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at the problem of difficulty in inspecting callus fusion ratio because the fusion process occurs inside the branch,a nondestructive inspecting method based on computer vision was proposed in this study.The computed tomography was used to obtain the tomography images at different positions of the graft union for grape hard grafting seedlings.By extracting regions of interest and adding mask,the processing was simplified.The features of sieve tube,duct,and non fusion area of graft union were separated by adopting the maximum between-cluster variance threshold segmentation method.Eight neighborhood region growing method was used to mark connected domain,area threshold was set and the non fusion area features of the graft union were extracted.And by adopting cumulative probability Hough transformation line detection,the non fusion area features of the graft union were refined.The non fusion area features at different positions of the graft union were added,and the total non fusion area feature was obtained.By calculating the total non fusion feature area and the graft union area respectively,and the callus fusion ratio was then obtained.The results showed:The processing of the algorithm was 92.39 s,and the relative error was 3.31%,the callus fusion ratio of grape hard branch grafting seedlings could be detected quickly and accurately.The visual inspection method of this study provided technical support for the study of process,mechanism and influence factors of the callus fusion of grape hard branch grafting seedlings.Keywords：grape hard branch grafting;callus fusion ratio;visual inspection;region growing;PPHT3|10|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In view of the fact that the traditional finite element method cannot study the effect of vegetation on slope stability from the meso scale,the influence of the location of slope protection vegetation on the stability of clay slope is studied by using discrete element model combined with strength reduction method.The results show that:1) The safety factor of slope is 1.08 under the condition of no slope protection with the combination of the discrete element model and the strength reduction method.The safety factor obtained by the finite element model is 1.09.It is proved that it is feasible to use the discrete element model and the strength reduction method to analyze the slope stability;2) The position of vegetation slope protection has different influence on the stability of clay slope.Only planting vegetation in the dome,toe or the top of slope,the vegetation on the slope stability influence is very small;3) When planting vegetation both on the dome and toe or both at the top and bottom of the slope,vegetation has a great influence on the slope stability.And when the top of the slope,slope and slope bottom is planted,the effect on the stability of the slope is maximum,the slope stability is the highest.In conclusion,this research can provide references for the slope protection of the actual project.Keywords：discrete element model;strength reduction method;vegetation slope protection position;clay slope stability4|13|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In this study,definition and classification of forestry residue were discussed and improved according to previous studies.Different terminologies of the total potential residue produced from forest production,process,and utilization were reviewed,the terminology of forestry residue was thereafter recommended to be used for consistently and uniformly understanding in future.Forestry residue was divided into the first categories of wood residue,bamboo residue,and herbaceous fruit tree residue.The three categories were thereafter classified and defined according to the potential residue components,respectively.Wood residue was classified into forest woody nursery residue,forest woody pruning residue,wood logging residue,firewood,wood bucking residue,wood handling residue,and waste wood.Bamboo residue was classified into bamboo processing residue and waste bamboo.Herbaceous fruit tree residue consists of banana and pineapple tree residue.Some possibly mistakes in definition and classification in previous reports were analyzed and revised.The results of this study would be helpful to evaluate the distribution and quantity of potential forestry residue.Keywords：biomass;organic waste;bamboo residue;residue from forest pruning4|9|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study took the agricultural statistics data of Lanzhou from 2003 to 2015 as the foundation to calculate the agricultural carbon emission characteristics and evolution through the construction of index system,and used the LMDI analysis method to analysis the influence factors of agricultural carbon emissions from 5 aspects,which includes the agricultural carbon emission intensity,industrial structure,agricultural structure,economic factors and demographic factors.The results showed that:The agricultural carbon emissions of Lanzhou was significant growth trend nearly 13 years,but the intensity of carbon emissions decreased year by year;The land ploughing was the largest proportion of carbon emissions,accounting for more than 40%;The carbon emissions was produced by agricultural film,fertilizer,irrigation and the use of machinery accounted for the second;Agricultural economic development had the greatest impact on carbon emissions,while the demographic factors and agricultural structure factors took second place.The carbon emission intensity of agriculture,industrial structure had an effect on carbon emissions;The top three agricultural carbon emissions in 2015 were Yuzhong,Yongdeng and Gaolan,their total carbon emissions accounted for 83.55%.The results suggested that Lanzhou should actively promote land rotation fallow in the process of agricultural development in the future,reduce the use of pesticides,chemical fertilizers and promote the cultivation of green manure crops,large-scale development,develop ecological agriculture,accelerate the transformation of traditional agriculture to modern agriculture and promote the smooth implementation of agricultural carbon emission reduction in Lanzhou.Keywords：agricultural carbon emissions;LMDI factor decomposition model;influence factor;spatial difference3|9|9<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In view of the fact that the scale and refinement of current precipitation research are difficult to meet the needs of urban stormwater forecasting,drainage planning and emergency management,methods and framework for analysis of the long-term multi-scale evolution characteristics of urban precipitation are proposed to provide guidance for the scientific management of urban floodplain.Harbin is taken as the research area.The linear fitting,Mann-kendall test and Morlet wavelet analysis methods are adopted to analyze the precipitation evolution characteristics of Harbin main urban area.The results show that:In the past 53 years,the autumn precipitation in Harbin has decreased,and the precipitation in spring,summer and winter display the same trend as annual precipitation.The precipitation in summer accounts for 66.07% of the annual precipitation.The number of rainy days above the heavy rain increases slowly,but the intensity is gradually weakened;The annual precipitation mutation periods are the years of 1964,1966,1980 and 2011.The spring precipitation mutation is on 2007,and the summer precipitation mutation periods are on years of 1981 and 2003.The abrupt changes in precipitation in autumn and winter are on 1973,1997 and 1971,1991;The primary and sub-cycle of annual precipitation change are 35 and 20,and the same as the days above heavy rain,spring precipitation changes show a 36-year main cycle and a 14-year sub-cycle.There are 20-year and 36-year cyclical changes of precipitation in summer,autumn,and winter.However,there is a difference between the main cycle and the sub-cycle.Keywords：urban precipitation;time series;multi-scale;evolution;Harbin main urban area2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to further study the relationship between urban construction land and economic development,a decoupling model is used in this study to analyze the decoupling relationship between urban construction land expansion and economic growth in Jilin Province.The results show that from 2000 to 2015,the decoupling between urban construction land expansion and economic growth in Jilin province tends to be reasonable,and urban decoupling is divided into three categories.The first category is ideal cities including Liaoyuan and Baishan.The second category is basal ideal cities including Changchun,Tonghua,Songyuan,Baicheng,and Yanbian.The third category is non-ideal cities including Jilin and Siping.Therefore,a relevant measures is put forwarded in this study to promote the further decoupling of construction land expansion and economic growth,and realizes the sustainable use of land resources.Keywords：urban construction land;economic growth;decoupling theory;elasticity analysis method;Jilin Province1|7|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
The effect of identity integration on the employment of rural-urban migrants:Based on a PSM approach
Abstract：The concept of identity integration is essential to understand the economic behavior of rural-urban migrants.This paper examines the effect of identity integration on the employment of rural-urban migrants in China.Data from a survey conducted in Zhejiang Province,China in 2013 is reported in this paper.The propensity score matching method is applied to address the sample selection bias.The results show that identity integration has quantitatively large and statistically significant effect on the workforce participation of rural-urban migrants.However,the effects of identity integration on self-employment and work intensity are not significant.In addition,the impact of identity integration on employment varies among different categories of gender,generation and places of household registration (hùkǒu).The results indicate that the integration of rural-urban migrants into cities enables them to develop long-term plans in the city and promotes a stable labor supply,which benefits China's economic development.Keywords：employment;identity integration;PSM;rural-urban migrants1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27- Abstract：In order to further clarify the poverty base and improve the accuracy of poverty assistance in minority areas,the multidimensional poverty status quo of the poverty-stricken farmers in minority regions was estimated and decomposed using the A-F multidimensional poverty measure method and improved Park aiming quantity gap formula by selecting Yi ethnicity areas of Da Xiao Liangshan as the research samples.An analysis of the "Five batches" of the poor farmers was then conducted.The results showed that:1) Multidimensional poverty existed commonly in poverty-stricken rural households in minority areas,especially the social security and living conditions.2) Family characteristics had significant influences on household multidimensional poverty;Family which was controlled by female,with the lower the educational level of the controlled households and more population were suffered more seriously deprivation.3) Unlike the Han region's issues,absolute poverty in poor households was relatively severe.What's more,outworking did not alleviate poverty;on the contrary,it enhanced the burden of their families.4) Those pro-poor measures which easily led to performance and had a low entry threshold went comparatively better,and had a higher targeting rate.5) In general,leakage was more than infiltration in the process of mitigating poverty.Therefore,effective connection should be made among multidimensional poor identification and accurately support in national regions in the next few years.And the key measure should also be taken to solve the absolute poverty,lacking of the ability to overcome poverty,poor infiltration and leakage problems.Keywords：ethnic minority areas;poor rural households;multidimensional poverty;accuracy of pro-poor measures0|9|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to study the impact of peasants' part-time working on land transfer in less-developed areas.Based on a survey data of Yunnan Province,an empirical analysis is performed using Logit and multiple linear regression model.The average level of education was used as instrumental variable to control the endogeneity problem by IV-Probit and 2SLS model.The results show that:It is not proper to simply think that the part-time working behavior of peasants will promote or inhibit the land transfer.The probability is related to the degree of part-time working behavior of peasants;Peasants' land transfer has significant difference under different levels of part-time working behavior,Part-time working peasants and non-farming peasants choose to outflow their land more likely;The relationship between the ratio of the land outflow and the degree of part-time working behavior of peasants show U-shaped curve.In conclusion,during the process of promoting rural land circulation,the corresponding guiding policies could be introduced to less developed areas by giving the peasants of own initiative full play to the role in the promotion of rural land circulation and promoting the widespread and scattered part-time working peasants in less developed areas to transfer their land voluntarily.Keywords：part-time working of peasants;land transfer;endogeneity problem;less-developed area0|10|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at traveling salesman problem in the cooperative distribution of fresh agricultural products,cost allocation problem is studied by core method,Shapley,GQP,MCRS and the proportional cost allocation methods.The results show that 1) Compared with the separate distribution cost,the cooperation is more favorable because the shared cost of each customer obtained by core method is saved by at least 11.7% and up to 80.9%;2) It is found that the customers with low demands should join an alliance.However,when the demand of the customer is high,the condition that forming alliances with other customers is stricter;3) The cost allocation solution obtained by the core method is superior than the one obtained by the other methods;4) If there are lack of software tools,the proportional cost allocation method based on the third party logistics cost will be chosen firstly.Then the cost allocation method based on the demands of the customers will be chosen.The study can provide theoretical reference of the cost allocation for the joint distribution of the farmer cooperative organization.Keywords：fresh agricultural products;traveling salesman problem;cooperative game;core4|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the development mode of the whole industrial chain of Antarctic krill fishery in China,the development characteristics of the whole industrial chain of Antarctic krill fishery in Liaoyu Group Co.,Ltd were analyzed by using Thomson Innovation database and CCAMLR database.The results showed that:1) Since the fishing season from 2009/2010,fishing vessels had been continuously engaged in the production of Antarctic krill fishing;2) A total of 6 patents were authorized in the Antarctic krill oil research and development part,the core technology of industrial development was reserved;3) More than 10 Antarctic krill related products were developed and sales channels were established through the Internet.A full industrial chain development model was initially established by Liaoyu Group Co.,Ltd.In order to further enhance the international competitiveness of Antarctic krill industry of Liaoyu Group Co.,Ltd,suggestions were put forwarded after exploring the development opportunities and challenges in this study,which were making industry development plan of Antarctic krill fishery,developing patented technology protection strategy,constructing Antarctic krill information platform,strengthening high-end product R & D investment and promoting the construction of a new type vessel of Antarctic krill fishing and processing.Keywords：the whole industry chain;Antarctic krill;development model;multi-source data;distant water fishery2|8|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
