Issue Ebookcover storyIssue CoverIssue Contents
List of IssuesDocument Types
- Abstract：The adsorption ability of different heavy metal ions by corn stalk-based biochars of 300 and 500℃,respectively was investigated in solution system with single and multiple ions.The experimental data were fitted by isothermal adsorption model.The results showed that 500℃ biochar has higher adsorption capacity than that of 300℃ biochar.For the same biochar,the order of the saturated adsorption capacity of biochar in single ion solution is Ni2+ < Zn2+ < Cd2+ < Pb2+ < Cu2+.However,under the condition of high concentration of metal ions in heterogeneous solution system,the interaction between ions has a great influence on the adsorption capacity of biochar.Meanwhile,both biochars show higher adsorption capacity to Cu2+ and Pb2+.In conclusion,these results provide references for choosing suitable biochar remediation schemes for different heavy metal adsorption characteristics in practical applications such as wastewater treatment.Keywords：corn stalks;biochar;heavy metals;adsorption2|11|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A total of 544 rice materials were assessed for blast resistance and resistance genes distribution by inoculation and screening of molecular markers tightly linked to 10 major resistance genes.Among the 544 materials,25,50,78,152,156 and 83 exhibited high resistance,resistance,moderate resistance,moderate susceptibility,susceptibility and high susceptibility,respectively.Ten resistance genes corresponding to markers were found in these materials;Two and three resistance genes were found in 4 and 17 materials (0.7% and 3.1%);Four to six resistance genes were found in 476 materials (87.5%);Seven resistance genes were found in 47 materials (8.6%).The resistance of all rice materials was significantly associated with resistance genes.Pi5,Pita,Pi9 and Pib exhibited high resistance to 6 physiological races.The majority of resistance genes were found in Longjing 968,Xiushui 134,Jia 58,Jindao 263,Huaidao 20,Yandao 10 and Gumei 4.Pyramiding different resistance genes in rice by marker-assisted selection was suggested as the most economical,effective,and environment friendly measure for controlling rice blast disease in this study.Keywords：rice blast;resistance genes;molecular markers;gene pyramiding2|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to investigate the inheritance of Iris hybrid,the reblooming bearded iris cultivar Iris ‘Halston’ and I. ‘White and Yellow’ were selected as parents for hybridization to establish F1 generation and BC1 generation.The results showed that:1) The reblooming rates of F1 and BC1 were improved by 24.14% and 35.18%,respectively;2) The length of falls and standards,as well as the width of falls and standards,which were key ornamental characters of bearded iris,may be linked inherited;3) The bloom colors of BC1 had abundant variations,leading to seven different kinds of colors,namely white type,purple halo type,yellow type,dark color type,type with stains on the basal part of fall,type with stains on the edge of fall,type with purple fall and yellow standard;4) The falls and standards of F1 and BC1 performed various shapes and became narrower and longer,thus their ornamental values were improved.In conclusion,the floral characters of reblooming bearded iris were linkage traits.Hybridization and backcross with I. ‘Halston’ and I. ‘White and Yellow’ being parents could generate more rebloomers,flower colors and shapes.Keywords：iris;reblooming;hybrid;phenotypic character0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to systemically study the classification,morphological and anatomical characteristics of Chionanthus retusus,the morphological characteristics and anatomical characteristics of leaves and petioles of 14 main bio-types of C.retusus in North China were analyzed.The morphological results showed the morphological characteristics of different C.retusus types were significantly different,and their canopy,stance of branches,bark traits and leaf shape were significantly different.These results reflected possible genetic differentiations among different bio-types.The observation of anatomical structures showed that:1) Leaves of 14 C.retusus bio-types were typical dorsiventral leaf type,epidermal cells and palisades were both monolayer with close arrangement,and the blade of leaves and the surface of petioles were covered with hairs and cuticle.2) There were differences in the structures of different C.retusus bio-types in the transverse sections of leaves and petioles.The shapes of transverse sections in the middle part of petioles were all nearly semi-rotundity,but the vascular profiles were different and could be divided into three types,nearly semi-rotundity,semi-rotundity and nearly rotundity.3) The vascular stands were almost amphicribral,but the number and size in each bio-type of vascular stands were different.Of 19 anatomical features screened,the differentiation relationship of 14 C.retusus bio-types was studied by cluster analysis.Through comprehensive comparison of morphological features and anatomical characteristics,we found that there were obvious differences among different bio-types,it could be used as an important basis for its identification of bio-type.The results of our study could provide the basis for the identification and plant selection of C.retusus,and it also had theoretical and practical value in strain orientation and resource identification.Keywords：Chionanthus retusus;leaf;petiole;anatomy;taxonomy0|13|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to determine the target relationship between yak Smad1 gene and bta-miR-1434-5p,establishing foundation to clarify the molecular mechanism of bta-miR-1434-5p regulation.The bta-miR-1434-5p and Smad1 mRNA expression profiles of yak tissues were detected by RT-PCR,and the targeting relationship between the 3'untranslated region (3'UTR) of Smad1 gene and bta-miR-1434-5p was explored through the construction of pmiR-RB-REPORTTM dual-luciferase reporting vector.The results showed that:Smad1 mRNA was widely expressed in many tissues of yak such as hypothalamus,pituitary,heart,liver,spleen,lung,kidney,skeletal muscle,lymph node,ovary,oviduct and uterus;bta-miR-1434-5p was co-expressed with Smad1 mRNA in other tissues of yak except oviduct.The 3'UTR of yak Smad1 gene sequence was obtained and the wild and mutant type of pmiR-RB-REPORTTM dual luciferase reporting vectors were successfully constructed.Luciferase activity was detected after co-transfection of the wild or mutant type vector with bta-miR-1434-5p mimics or non-target control (NC) in 293T cells,respectively,and the down-regulation effect of the luciferase expression level of the bta-miR-1434-5p mimics to wild type reporter vector of Smad1 gene was not significant.It is concluded that bta-miR-1434-5p could not target to this fragment of the 3'UTR of yak Smad1 gene.Keywords：Yak;bta-miR-1434-5p;Smad1;gene;tissue profile;vector construction2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The objectives of this study were to investigate the effects of dietary supplementation of the SCD accelerator (rosiglitazone) and inhibitor (phoenix tree seed oil) on the activities of FAS,LPL,ACC and SCD in longissimus muscle and subcutaneous adipose tissues in fattening sheep.Eighteen crossbreed ram (Merino sheep♂×Han sheep♀),similar in body weight (27.71 + 2.64 kg) and birth date,were randomly divided into three groups with six animal each:Animals in the first group (C group) were fed with control diet;Animals in the second group (L group) were fed with control diet plus rosiglitazone at the rate of 8 mg/d;the third group (W group) were fed with control diet plus phoenix tree seed oil at the rate of 15 g/d.The results showed that:1) Compared to animals in control diet,animals in L group had significantly higher LPL and SCD activities in longissimus muscle and significantly higher FAS activity in subcutaneous fat (P<0.05) in sheep while no significant effects were observed on the ACC activity in the longissimus muscle and subcutaneous fat.2) Compared to animals in control diet,animals in W group had lower ACC and SCD activities in longissimus muscle,but no significant effects on the activities of ACC,FAS,LPL and SCD in the subcutaneous fat were observed.This study showed that rosiglitazone can increase the activities of SCD and FAS by improving body sensitivity to insulin In addition,rosiglitazone can also enhance the activity of LPL in tissue by activating PPAR-γ,The phoenix tree seed oil,which is rich in unsaturated fatty acids,can affect enzyme activity in the tissues by inhibiting the expression of ACC gene,the activity of SCD was reduced by sterculic acid and other polyunsaturated fatty acids in phoenix tree seed oil.Keywords：stearyl CoA desaturase;fatty acid synthase;lipoprotein lipase;acetyl-CoA carboxylase;phoenix tree seed oil;rosiglitazone;enzyme activity0|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to investigate the effect of human lysozyme transgenic milk on intestinal health.The mouse pups were nursed randomly by transgenic mother mice (PC group) and non-transgenic mother mice (NC group),and the experiments as follows were performed on day 3,11,21,30 (D3,D11,D21 and D30):the number of intestinal bacterial flora was counted,the fecal morphology of mouse pups in different groups was observed,and the mice were induced to diarrhea models by injection of Escherichia coli.The results showed that:1) The total bacteria in PC group was significantly lower than that in NC group at D11 and D21 (P<0.05);The quantity of beneficial bacteria Lactobacillus spp.in PC group was significantly higher than that in NC group at D21 (P<0.05),and the Bifidobacterium spp.was also significantly higher than that in NC group at D11 and D30 (P<0.05);The quantity of harmful bacteria E.coli in PC group was significantly lower than that in NC group at D21 (P<0.05),the Streptococcus was very significantly lower than that in NC group at D11 (P<0.01) and significantly lower than that in NC group at D21 (P<0.05),the Enterococcus was very significantly lower than that in NC group at D11 (P<0.01),and the Clostridium was significantly lower than that in NC group at D11 (P<0.05).2) The lysozyme activities of small intestine contents were 1803±93 U/μ g in PC group,while was only 73±23 U/μ g in NC group;the semisolid stools were formed in the proximal/middle of colonin in PC group(9/10),whereas in the middle/end of large intestine in NC group (8/10).3) The mortality rate of diarrhea mice model in NC group was 60%,while in PC group was 0.Inconclusion,recombinant human lysozyme of the transgenic mice kept high activity in the small intestine of mouse pups,which significantly increased the number of beneficial bacteria,reduced the number of harmful bacteria in the intestine,promoted semisolid stool formation and provided protection for the mouse diarrhea model.0|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Alfalfa (Medicago sativa) is widely cultivated in the world.Alfalfa root rot has become one of the most important factors resulting in quality decline and yield losses of alfalfa.To explore the difference in pathogenicity and the pathogenic mechanism of Fusarium causing alfalfa root rot,150 Fusarium strains isolated from the samples of alfalfa root rot collected from Huanghua and Xuanhua District in Hebei Province,China,among which 72 strains were isolated in 2015 and 78 strains were isolated in 2016,were used in this study.Pathogenicity determination of all Fusarium strains was conducted using plate method.The DON (deoxynivalenol) and NIV (nivalenol) mycotoxins producing potentialities of the strains were investigated.And bioactivity tests of crude mycotoxins derived from strain QD3-2 (F.oxysporum),which was identified as NIV chemotype,were performed.The results showed that all the isolated Fusarium strains induced pathogenicity on germinated alfalfa seeds,but there were differences among the pathogenic intensities.Most Fusarium strains exhibited strong pathogenicity except F.tricinctum strains and most F.equiseti strains.Strain KD3 (F.oxysporum),strain QD3-2 (F.oxysporum),strain N6-1 (F.equiseti),strain N9-2 (F.acuminatum),strain NT1-1 (F.acuminatum) and strain QD10-1 (F.acuminatum) displayed potential to produce NIV,and there were no strains showed DON producing potentiality.After fermentation,crude mycotoxins were extracted from strain QD3-2 using organic solvents.The bioactivity tests demonstrated that the crude mycotoxins had strong inhibitory effects on the germination of alfalfa seeds.This study would provide theoretical references for further studies on the pathogenic mechanism of pathogens causing alfalfa root rot,efficient management of alfalfa root rot and alfalfa production safety.Keywords：alfalfa root rot;Fusarium;pathogenicity;mycotoxin chemotype;crude mycotoxin0|11|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Lipase-producing strains isolated from soil were screened by the color-changing circle method and transparent circle method.These strains were identified according to their morphology,Gram staining and 16S rDNA sequence analysis.A total of 51 high lipase-producing strains were isolated on Rhodamine B screening plates by using HC index.Compared the HC of the strains screened by olive oil screening plates,L-17,the strain of highest HC 2.27,was identified as target strain.The enzyme activity of L-17 was determined by transparent circle method,and its HC was 3.07 which proved the high enzyme activity of L-17.The L-17 strain was identified as Burkholderia cepacia with high lipase yield,which had potential research and development value.Keywords：lipase;screening;identification;Burkholderia cepacia2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The physiochemical changes of myofibrillar protein from silver carp,chicken breast and their mixture (m(silver carp):m(chicken)=1:1) were investigated by measuring the content of salt-soluble protein and sulfhydryl group,and the changes of protein conformation and SDS-PAGE during heating also analyzed.The results showed that:The content of salt-soluble protein decreased to 1.00 mg/mL,and the total content of sulfhydryls decreased over 60%,and the fluorescence intensity of the tryptophan and the content of the α-helix decreased to a stable level with temperature for three proteins.The changes of the blended myofibrillar protein were similar to chicken breast myofibrilIar,which was previously expected to be constant from 0 to 40℃,then dropped dramatically to the lowest at 50℃.However,the changes of the myofibril from silver carp basically kept the same at the range of 0 to 30℃,and then reached a low point at 40℃.The thermal denaturation and SDS-PAGE results displayed that the myofibrillar of the silver carp denatured at 40℃ and the mixed meat and chicken protein denatured at 50℃.Above results indicated that the accumulation of myosin heavy chains led to changes in the molecular conformation of the protein at denatured temperature during the heating process.In addition,there were differences between the blended protein and single protein,which improved gel properties of blended protein by combining the advantage of single protein.Keywords：myofibrillar protein;silver carp;chicken breast;blended meat;thermal denatured temperature0|11|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the applicability of the general-purpose cutter and poor cutting quality of current sunflower harvesting machinery during sunflower stalks harvesting,the cutting method of the sunflower stalk is simulated by the match way of the straight blade cutter on the microcomputer control electronic universal testing machine.The degree of influence on the cutting resistance and cutting power consumption and the variation rule of cutting resistance of sunflower stalk under different conditions are studied by changing the angle of the cutting edge,cutting angle and chamfering angle.The results show that:1) When the cutting speed is constant and the angle of the cutting edge is 0°-20°,the cutting resistance peak and the power consumption decrease with the increase of the cutting edge angle,at the same time,the sliding effect is enhanced.When the bevel angle is about 20°,the cutting power consumption is smaller.2) When the cutting speed is constant,the cutting angle changes from 0° to 45°.The peak cutting force and the cutting power consumption are gradually reduced and then sharply increased.When the cutting angle is about 15°,the blade is applied with cutting resistance and cutting power consumption is smaller on sunflower stalks.3) When the cutting speed is constant,the chamfering angle is changed in the range of 0°-60°.The cutting resistance peak and the cutting power consumption are gradually reduced and then rapidly increasing.When the chamfering angle is about 30°,the cutting power consumption is smaller.This study can provide a theoretical basis for the design and improvement of sunflower cutting device.Keywords：sunflower;stalk;cutting angle;cutting resistance2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：3D model of air ventilation and circulation system was designed to improve the velocity and temperature value and their uniformity in plant factory.CFD (Computational fluid dynamics) was applied to create a three-dimensional model and the whole plant factory was divided into grids and simulated.CFD model was validated through experimental data comparison of the distribution of air flow and temperature.The maximum absolute error,average relative error and root mean square error of wind speed and temperature were 0.12 m/s,1.1℃;11%,4%;0.18 m/s,1.3℃,respectively,which showed that simulation was accurate.Three cases were studied and compared in this study.The results showed that improve the velocity and temperature value and their uniformity were improved in all three optimized models compared with control.By comparing wind speed and temperature value of plant canopy surface,the average wind speed increased by 0.51 m/s,the coefficient of variation (CV) reduced by 17% and the average temperature reduced by 0.5℃,was the best air circulation system.This study provided theoretical basis for the design of air circulation system in plant factory.Keywords：computational fluid dynamics;plant factory;velocity;temperature;uniformity2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to clarify the mechanism of suitable water and heat conditions in transplanting hole,this study analyzed the effects of the wind speed near the soil surface on air velocity in the transplanting hole.Based on the three-dimensional numerical simulation model of transplanting hole under the condition of no crops planted,CFD software was used to simulate the internal airflow in the transplanting hole at 1.50,2.70 and 3.90 m/s,respectively.The flow velocity was verified by experimental test.The simulation results showed that the average air speed of the longitudinal section was 0.25,0.48 and 0.72 m/s,respectively,when the wind speeds near the soil surface were 1.50,2.70 and 3.90 m/s.In general,the average air velocity in the transplanting hole was reduced by 81.54% to 83.34%.When the wind direction near the soil surface was from right to left,the air in the vertical section of the transplanting hole was counterclockwise.The verification results showed that there was a positive linear correlation between the air velocity in the transplanting hole and the wind speed near the soil surface,and this linear fitting equation was y=0.220 9x-0.176 (R2=0.925 3).When the wind speed near the soil surface was 2.70 m/s,the air flow rate was 0.42 m/s by measurement and was 0.48 m/s by simulation in the transplanting hole of well-cellar style transplanting,respectively.The dispersed heat and moisture from the transplanting hole were decreased due to small atmospheric disturbances from the soil surface,which contributed to the maintenance of the suitable water and heat conditions for the growth of tobacco seedlings.Keywords：transplanting method;transplanting hole;wind field;air exchange;computational fluid dynamics0|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Fertigation technology is a new agricultural technology,which could enhance the utilization rate of water and fertilizer and increase the yield of crops.This study was focusing on the mixing characteristics of water and fertilizer solution in fertigation technology.The influences of the mixing time,length of the mixing interval,flow velocity and pipe diameter on the mixing efficiency were simulated based on the two-phase flow theory in fluid mechanics.The results indicated that the longer mixing time and mixing interval,the better the mixing efficiency and the final uniformity of water and fertilizer solution.The uniformity of mixture was better when the velocity ratio of water and fertilizer solution was small,and the mixing efficiency was higher under the larger flow rate of water and fertilizer solution.In addition,the influence of pipe diameter ratio of water pipe and fertilizer pipe on the mixing efficiency was greater when the flow velocity was low.And the smaller the pipe diameter ratio was,the better the mixing performance was.It's influence was weakened gradually with the increase of flow velocity.Keywords：fertigation;mixing efficiency;tow-phase flow;numerical simulation0|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the impact of base temperatures on growing degree-day (GDD) and simulation effect of GDD model on crop development phases,Miyun winter wheat developmental phase data covering heading-maturity periods from 1990 to 2015 were analyzed.Active growing degree-day (GDDA) and effective growing degree-day (GDDE) were calculated based on linear growth assumptions using a base temperature range of 5 to 15℃.Stability variations of GDD models,and simulation effects of GDD models on crop developmental phases were analyzed with different base temperatures (Tb).The results showed that:The stability and simulation effect of GDDA model were better than those of GDDE model based on root-mean-square error (RMSE) and coefficient of variance (CV) values of modeled results;The simulation accuracy (error<2 days) of GDD varied with Tb within the range of 5.0 to 12.5℃.GDDE simulations were more accurate than GDDA when Tb was less than 12.5℃.However it was the opposite when Tb was more than 12.5℃.Keywords：growing degree-day;growth and developmental assumption;base temperature;coefficient of variation;simulation accuracy1|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the structure of macroinvertebrates community and its relationship with environmental factors in Sun Island Bund Wetland of Harbin in spring,a survey was carried out on May,2016.A total of 34 species of macroinvertebrates,which belonged to 10 orders and 12 families,were collected.The aquatic insect class had the highest number of 19 species contributing 55.88% of the total species,which was followed by mollusk 9 species contributing 26.47%.Four species of annelid and 2 species of crustacean accounted for 11.76% and 5.88% of the total species,respectively.Polypedilum pedestre,P.flavum and Unio douglasiae were the most dominant species of all.The density of the macroinvertebrates in the Sun Island Bund Wetland was 157.44±103.28 ind/m2,and the biomass was 229.61±517.29 g/m2.The Simpson diversity index,Margalef richness index and Shannon-Weiner index were 4.11±1.85,0.83±0.48,and 1.35±0.66,respectively.The main water physical and chemical factors affecting the distribution of macroinvertebrates were total phosphorus and oxidation-reduction potential.The study showed that pH had the closest relationship with the species composition and density of macroinvertebrates in Sun Island Bund Wetland of Harbin,while the nitrite displayed the greatest impact on biomass.Keywords：macroinvertebrates;community structure;biological diversity;environmental factors;Sun Island Bund Wetland of Harbin0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the characteristics of nitrogen deposition in the Qinghai-Tibet Plateau,references on atmospheric nitrogen deposition and its effect on the plateau ecosystem under the background of rapid economic development in Tibet region are reviewed.The results of previous atmospheric nitrogen deposition monitoring study in different areas of the Qinghai-Tibet Plateau are summarized.The effects of atmospheric nitrogen deposition on grassland ecosystems are summarized and compared.The results show that:The quantitative analysis of nitrogen deposition fluxes in the Qinghai-Tibet Plateau are relatively less,which are limited to short-term monitoring or only quantitative precipitation nitrogen content.Long-term situ monitoring,atmospheric reactive nitrogen composition characteristics,urban-rural differences and trends are still unknown;Plant diversity,plant stoichiometry and phenology under enhanced atmospheric nitrogen deposition in Qinghai-Tibet Plateau grassland are still unclear,especially the mechanism is ambiguous.Nitrogen deposition,as one of the main driving factors of global change,and its impact on the ecological environment in the Qinghai-Tibet Plateau needs to be further investigated.Keywords：nitrogen deposition;plant response;soil response;Qinghai-Tibet Plateau1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Research on the coordinated development of the economy and environmental function of land use was significantly important for the achievement of sustainable use of land resources.Taking Zhangjiakou City of Hebei Province as the study area,an evaluation indicator system of environmental function of land use was constructed based on the existing research and related support theory.A comprehensive index model was used to analyze the characteristics of environmental function of land use in Zhangjiakou City from 2000 to 2013.The coupling coordination relation between the environmental function of land use and economic development was then explored by using the coupling coordination model.The results showed that:1) The environmental function of land use from time dimension displayed a fluctuant increasing trend during 2000 to 2013;2) The coupling relationship between the environmental function of land use and economic development was promoted from mild disorder level to well coordination level.Relevant suggestions were proposed in this study to achieve the coordinated development of environmental function of land use and social-economy in Zhangjiakou city.Keywords：environmental function of land use;economic development;coupled coordination;evaluation system;Zhangjiakou City0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore price spillover mechanism between energy market and corn markets,this study focuses on the price spillover effects between foreign crude oil market,foreign corn market and domestic corn market by using the VEC-BEKK-GARCH(1,1) model.The results show that:In terms of mean,the co-integration among the three markets is significant.There is two-way mean spillover effect between foreign crude oil price and foreign corn price,and transmission effect of the latter onto domestic corn price is greater than the former one.In terms of variance,the significant two-way volatility spillover effect also exists between the two markets,and the effect in each pairing differs from the others in intensity and type.The correlation between foreign crude oil price and foreign corn price is the strongest.However,for the domestic corn price,the volatility spillover effect of foreign oil price is weaker than that of the foreign corn price.As for the type of the effects,the effect of corn prices on energy price show both ARCH and GARCH effects.Keywords：crude oil price;corn prices;VEC-BEKK-GARCH (1,1) Model;volatility spillover effect0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the influence of herdsmen's family endowment and migrant on the breeding technological demand,the present situation and the influencing factors was analyzed by using the order Logit model based on the survey data of 885 sheep farmers in Naqu and Rikaze in Tibet.The study showed that herdsmen's technical demand was lower,when the roughing technology of co-product was relatively higher.The family income,the proportion of the sheep breeding income,the relationship with villagers,the number of migration and the technology cognition had significant positive effect on breeding technology demand.However,religious faith had no effect on breeding technology.Therefore,the roughing technology of co-product should be a focus in government technology extension.In the meantime,expanding the migration channels,strengthening the publicity and training of breeding technology,regulating the grassland circulation to promote moderate scale operation would promote the grassland sustainable development while improving the efficiency of sheep farming.1|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the phenomenon of rural households' exiting from backyard hog production during the structure change of livestock industry,this study puts forward some concepts such as partial livelihood system,livelihood function,livelihood dependency and livelihood breakthrough,and constructs an analytical framework for farmers' exit from backyard hog production on the basis of sustainable livelihoods framework.According to the livelihood function,the rural households are divided into 3 categories,which are income diversification,pork self-sufficiency and risk prevention.An empirical study is carried out by using rural household survey data.The results show that the phenomenon of exit is simultaneous but there are different degrees of exit among rural household types.The exit of different type of rural household is driven by distinct factors,and the same factor may affect different type of rural household differently.The overlap of favorable geographical and transportation conditions,the younger head age,the shortage of cultivated land resources and the non-agricultural employment are the main reasons for the exit of income diversification-orientated rural households.Change in pork consumption preferences is elicited by traffic conditions,non-farm work,non-agricultural business,and income growth.The pork consumption is the main reason for the exit of pork self-sufficient rural households.The significant reduction of survival hazard is the main reason for the exit of risk prevention-orientated rural households.In the end,policy suggestions for the farmers exit from the pig production are put forwarded.Keywords：rural household;backyard hog production;sustainable livelihoods;livelihood function;exit0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this review is to optimize grassland ecological compensation mechanism,protect grassland ecological environment and improve herdsmen living based on the research and practices of the effects of grassland ecological compensation on the sustainable livelihood of pastoralists.Using sustainable livelihoods analysis framework,this research focuses on the analysis framework of grassland ecological compensation for the sustainable livelihood of pastoralists,transformation structure and process,and the shortage of research.The analysis shows that the grassland ecological compensation affects the livelihood assets of herders,transformation structure and process,livelihood strategies and their livelihood results.In particular,institutional factors can influence the sustainable livelihood of pastoralists.Therefore,the analysis index system of grassland ecological compensation for the sustainable livelihood of pastoralists is constructed.It is pointed out that the future research direction of grassland ecological compensation to the sustainable livelihood of herders should be focused more on the transformation model,research content and risk prevention.Keywords：grassland ecological compensation;the livelihood of pastoralists;sustainable livelihood analysis framework2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to explore the customer's most concerned product attributes and the differences in the preferences of online comments on cooked food sales,waterfowl cooked food was selected as research object by collecting one month of consumer reviews on 14 kinds of waterfowl cooked food brand.And the attributes of all the comments are classified,and the influence mechanism of the online sales of waterfowl food products is tested on their quantitative attribute score.The results show that:1) Consumers are most concerned about the quality and safety attributes of cooked food products,and the preference differences in waterfowl reviews have a negative effect on sales.2) Word of mouth polarity and reputation weakens the impact of differences in preferences to some extent,thereby increase sales of products.On this basis,suggestions are proposed that the waterfowl cooked food manufacturers need to take into account of product quality,product safety and other aspects to enhance the overall quality of product,improve the product's reputation and word of mouth polarity and thereby enhance product sales.Keywords：online reviews;preference variability;consumers;waterfowl cooked food;sales0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To analyze the technology-based poverty alleviation effect quantitatively,an econometric model is established based on the questionnaire survey data of 400 households in 5 villages,Dianping Town,Fenxi County,Shanxi Province on 2016.The results show that:The total effect of technology-based poverty alleviation is significantly positive,which means technology-based poverty alleviation has a positive effect on the per capital net income of farmers.The independent effects of technology-based poverty alleviation is not significant,which is not significant to simply increase the material capital of farmers to per capita net income of farmers.The linkage effect of technology-based poverty alleviation is remarkable,which indicates that the improvement of technology-based poverty alleviation infrastructure and farmers' skill level have a significant impact on the per capita net income of farmers.Therefore,the administration should not only make full use of the linkage effect of technology-based poverty alleviation,but also pay attention to improve agricultural infrastructure and farmers' skill.Keywords：technology-based poverty alleviation;Lvliang mountain;contiguous destitute areas;poverty alleviation effect5|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
