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- Abstract：To investigate the effect of germination on the phenolic compounds and antioxidant activity of pea seeds,three pea varieties (‘16WDS017’,‘16WDS018’ and ‘16WDS021’) were used as materials.The dynamic changes in the growth characteristics (hypocotyl lengths,stem thick,root thick,root length),total phenolic content (TPC),total flavonoid content (TFC) and antioxidant activity (ABTS free radical scavenging capacity,ferric reducing antioxidant power) in different growth stages during germination were investigated.The results showed that the biomass yield of 127.06 g/100 strain and edible fresh weight of 38.93 g/100 strain for ‘16WDS017’ pea sprouts were the highest.Compared with non-germinated pea seeds,the phenolic contents and antioxidant capacity of pea sprouts were significantly improved after germination.With the prolongation of germination time,the content of total phenolic,total flavonoid and antioxidant activities of pea sprouts increased gradually,while the ‘16WDS021’ pea sprouts has higher phenolic contents and antioxidant activity than others.An extremely significant positive correlation between hypocotyl length and root length,phenolic content,antioxidant activity were discovers.The extremely significant positive correlation between total phenolic content,total flavonoid content and antioxidant activity were also revealed.In conclusion,the longer the pea germination time,the more accumulation of phenolic substances and flavonoids.Keywords：pea;germination;growth characteristics;phenolic content;antioxidant activity25|8|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To understand the codon bias of AtGAI in Amaranthus tricolor L.,AtGAI gene codon bias was analyzed by CodonW,SPSS and EMBOSS online program.Neutral drawing,ENc plots and parity rule 2 plot were subsequently used for the exploration of possible factors that affect the formation of the bias.The optimal receptor system was explored by comparing the frequency of the AtGAI gene and the pattern biocodon usage.The results showed that:1) The ENc,CAI,and GC content of AtGAI were respectively 50.75,0.195,and 41.91%,indicating that the codon bias level of AtGAI in A.tricolor L.was low and biased toward the synonymous codons with A or T.2) The CDS sequence and RSCU cluster analysis showed that the preference of AtGAI gene was the closest to that of caryophyllales containing betalain in dicotyledonous plants.3) The codon base composition and correlation analysis showed that the codon bias of GAI gene was mainly affected by the base mutation.4) The codon usage frequency comparison and analysis showed that the yeast eukaryotic expression system was more suitable for heterologous expression of AtGAI gene.The model plants Arabidopsis thaliana,tobacco,tomato and beet can be used as genetic transformation receptors for AtGAI gene,but beet is the most ideal genetic transformation receptor.This study indicated that mutational stress was the main factor in the formation of GAI gene codon bias.It is necessary to optimize and modify AtGAI codon according to the codon bias of the host genome for heterologous expression and genetic transformation analysis.26|10|16<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the impact of agricultural production materials inputs and agricultural disaster area on crop yield and the impact of crop comprehensive comparative advantage index on planting structure evolution in North China,the comprehensive comparative advantage index and linear regression method were adopted to analyze the changing characteristics of the crop production,agricultural production inputs and the agricultural disaster area in the 3 major grain producing provinces which were Hebei,Henan and Shandong province in North China from 1981 to 2015.The results showed that:1) During 1981 and 2015,the planting areas of maize and peanut in North China increased significantly,soybean and cotton decreased significantly,and winter wheat and canola were relatively stable.The yield of winter wheat,maize and peanut showed an increasing trend,and the yield of soybean and cotton showed a downward trend.The per unit area yield of all crops increased significantly from 1981 to 2015,among which the per unit area yield of winter wheat,maize and peanut increased faster,and the perunit area yield of soybean and cotton increased slower;2) During the same period,the nitrogen,phosphate and potash fertilizer inputs and effective irrigated area increased significantly in North China,with annual growth rates of 143 000 t,72 000 t,73 000 t and 122 000 hm2,respectively;3) Drought was the main agricultural disaster affecting crop production in North China,which decreased significantly from 1981 to 2015;4) Increasing in investment in agricultural production materials was the main driving factor in crop yield improvement,agricultural disaster was the main factor causing crop yield fluctuations,and the comparative advantage between crops was the main driving factor for planting structure changes in North China.Keywords：North China;planting structure;evolutionary feature;driving factors;comparative advantage23|10|7<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to study the law of aboveground dry matter accumulation and its distribution model of drip irrigation winter wheat in Southern Xinjiang Uighur Autonomous Region.Simulation models of relative dry matter accumulation (RDMA) in winter wheat population and individual aboveground parts based on relative growth degree day (RDDT) and distribution dynamics of organs based on distribution index were established by using statistical model technology based on the experimental data of nitrogen regulation in plots.The model was tested by the experimental data of water regulation.The result showed that:After reviving,the dry matter accumulation (DMA) of winter wheat under drip irrigation showed a typical "S" curve trend.Increasing water and nitrogen supply obviously promoted dry matter accumulation of populations and individuals,and the irrigation effect was greater than nitrogen application effect indicating that proper nitrogen application on the basis of ensuring water supply in extreme arid areas in the Northwest margin of Tarim Basin was the key to promote wheat growth.The variation coefficients of each treatment were 3.45%-5.19% in populations and 2.03%-3.91% in individuals,indicating that the population effect was greater than the individual effect.The effect of irrigation water treatment on group and individual DMA was greater than that of nitrogen application,which indicated that ensuring water supply was the first priority in extreme arid areas.Based on the normalized RDDT,the prediction model (MMF) for winter wheat group and individual RDMA after reviving under drip irrigation:GRDMAi=(0.001 2+1.003 2RDDT4.193 6)/(0.012 9+RDDT4.193 6) and SRDMAi=(0.001 2+1.011 3RDDT4.691 1)/(0.0189+RDDT4.691 1),and distribution index model of dry matter in various organs of the above-ground part were established,whose simulation accuracy being 0.988 5-1.027 04 and 0.977 5-1.035 4,respectively.These results showed that the model of dry matter accumulation and distribution in winter wheat populations and individuals based on RDDT and distribution index had good predictability and practicability.Keywords：drip irrigation;winter wheat;dry matter accumulation;partitioning index;model24|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study evaluated the natural 2n pollen yield of 38 persimmon germplasm resources for two consecutive years.I found that the 2n pollen yield of different resources was significantly different,and the same resource was also different in different years.Seshiwuxingxi #716 and Zhongshi No.4 were screened out of those varieties for having relatively stable 2n pollen yield and relatively high yield,and their 2n pollen yields were up to 7.17% and 6.80%,respectively.In the process of male flower development and microspore mother cell meiosis in the 34th resource,it was found that except for some abnormal phenomena such as lagging chromosome of metaphaseⅠ,triad,and dyad,the microspore mother cell meiosis process was more norm.It was also found that the meiosis process of microspore mother cells was related to the phenotype of male flowers,that was:When the flower bud began to swell and the corolla and sepals of the flower bud are flat at the top (April 8-April 12),the microspore mother cells were in the stage of meiosis,which was the best period for physicochemical induction of 2n pollen.Keywords：persimmon;ploidy breeding;2n pollen;meiosis;male flower phenotype23|8|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to analyse the differences of monosaccharide composition of polysaccharides in four different types mature period fruits of the big-fruit type,the inermous type,the early maturity type,the ordinary type of Ziziphus jujuba Mill cv.Lingwuchangzao,the water extraction and alcohol precipitation method was adopted to obtain the polysaccharides,which were subsequently purified by DEAE-52 cellulose column and HW-55S gel column,finally GC-MS was used to analyses the monosaccharide composition of purifed polysaccharides in fruit.The main research results showed that:1) The obtaining ratios of crude polysaccharides of the ordinary type,the big-fruit type,the early maturity type and the inermous type fruits were 1.795%,1.504%,0.999% and 0.956%,respectively,the order of crude polysaccharides contents in different types fruit from high to low was the ordinary type,early maturity type,big-fruit type and inermous type.2) The crude polysaccharides in different types fruits were fractioned respectively to be one neutral fraction (Ju-0),and three acid fractions (Ju-1,Ju-2,Ju-3) by DEAE-52 cellulose ion-exchange columns,and Ju-2 had the highest contents,this indicated that the main components of polysaccharides in fruits were acid fractions,but the mass and yield of the four polysaccharide components had significant differences.3) The contents of refined polysaccharide in different types fruits were significantly different between different components,the contents of Ju-0 and Ju-3 were the highest in the ordinary type fruit,the content of Ju-1 in the big-fruit type fruit was the highest and the content of Ju-2 in the early maturity type fruit was the highest.4) The contents of arabinose,galactose and rhamnose were higher,followed by the glucose,and the contents of mannose and xylose were the lowest in the refined polysaccharides of different type fruit,and there was no fructose in polysaccharides,the refined polysaccharide in different type fruits also contained the ribose,fucose,glucuronic acid and galacturonic acid compared by NIST mass spectrometry library.In conclusion,the monosaccharide compositions of the polysaccharide were similar in four different types Ziziphus jujuba Mill cv.Lingwuchangzao fruits,but the compositions and contents were significantly different in different polysaccharides component.23|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To evaluate the development of individual identification of dairy cows during production in recording milk yield,monitoring feeding activity,monitoring bed behavior,tracking activity track and other production projects,the literature related to methods and application of dairy cow identification 2008-2018 are retrieved by using "dairy cow","individual recognition","identification method" and "production application" as keywords.The results show that:1) Compared with traditional methods,biometrics identification could overcome environmental interference in many aspects to reduce harm to individual cows.2) Currently,intelligent identification technology associated with the monitoring of cow behavior could comprehensively monitor individual health status and production performance.3) China has made great progress in computer vision,which builds a solid foundation for intelligent identification of individuals.In the future,the research on individual identification technology should focus on improving the environmental adaptability and system compatibility to provide basis for the establishment of a complete automatic cow monitoring system.Keywords：dairy cow;individual recognition;identification method;production application26|9|8<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the research progress of beef cattle heat stress,literature related to heat stress in beef cattle over 2008-2018 are retrieved by using "beef cattle","production performance","biochemical indicators","molecular regulation mechanism" and "prevention and control of heat stress" as keywords.The retrieved documents are reviewed and analyzed.It is found that:On the one hand,the heat stress reduces the production performance,reproductive performance,immune function and antioxidant function of beef cattle,and activates the sympathetic-adrenal medullary axis (SAN),hypothalamic-pituitary-adrenal cortex axis (HPT) and hypothalamic-pituitary-thyroid axis (HPA);On the other hand,beef cattle can regulate target gene expression by miRNAs in blood under heat stress to participate in anti-heat stress response.However,there are only a few studies on the screening of heat-resistant genes and the nutritional criteria of beef cattle under heat stress.Future studies should focus on exploring optimal nutritional formulates for beef cattle under different degrees of heat stress and screening heat-resistant genes of beef cattle.Keywords：beef cattle;heat stress;production performance;heat shock protein;economic benefit25|9|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the latest research status of myofiber development characteristics of meat livestock and poultry (cattle,sheep,pigs and poultry),taking "livestock","myofiber development" and "meat quality" as keywords,literatures published in from 1981 to 2019 were searched and summarized from the perspectives of myofiber,myoblast production,molecular regulation of myofiber growth and development.The results showed that the general process of myofiber development in different livestock and poultry are similar;The time of myofiber development among species is different;Individual genes are determined to have the main function of regulating myofiber development.It is also found that there is still a lack of studies on the construction of gene regulatory networks,systematic comparison for multi-species myofiber development and the developing of universal molecular markers for meat quality identification.Keywords：meat livestock and poultry;myofiber development;molecular regulation23|8|7<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：For the rapid and simple detection of influenza viruses,a novel strategy based on fluorescence resonance energy transfer (FRET) was developed.By using ligand exchange method,glycan-functionalized quantum dots (gQDs) and glycan-functionalized gold nanoparticles (gAuNPs) were synthesized,respectively.The results showed that:The characterization of gQDs and gAuNPs revealed that they could be used as an effective FRET donor-acceptor pair because of their excellent optical properties,high aqueous solubility and stability;Based on these two glycan-functionalized nanomaterials,a FRET biosensor system was developed.Wheat germ agglutinin,which is a sialic acid-binding protein (SABP),was detected within 5 minutes with detection limit of 4 nmol/L.Because influenza viruses use their envelope SABP,hemagglutinin,to specificly recognize and attach to sailic acids displayed on the host cell surface.The method developed in this study would provide bases to develop gQDs and gAuNPs-based FRET systems for rapid and simple influenza virus detection.Keywords：sialic acid-binding protein;fluorescence resonance energy transfer;quantum dots;gold nanoparticles;wheat germ agglutinin23|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at the problem that the computational fluid dynamics software (CFD),which is used to simulate the airflow in the plant factory at present,ignores the obstructing airflow of lettuce.An wind tunnel experiment is conducted to study the aerodynamic parameters of lettuce canopy.The drag coefficient of lettuce canopy (CD) is determined by using wind tunnel system,and the relationship of lettuce canopy permeability (K) and momentum loss coefficient (Cf) in different leaf area density is investigated under the condition of (L) that the relationship between the place lettuce planting plate in the middle of their wind tunnel test section and measured vertical and horizontal direction under different measuring locations of the static pressure and wind speed.The viscous resistance coefficient and inertial resistance parameters required for the establishment of lettuce porous media model in CFD modeling are obtained through the obtained parameters.The results show that:1) The resistance coefficient of lettuce canopy measured in this experiment is CD=0.02;2),the permeability is 0.04 m2,and the momentum loss coefficient is 0.13 of mature lettuce (L=32.5 m2/m3);3) The values of the nonlinear momentum loss coefficient Cf are 0.1-1.0,and when the leaf area density L is 10,20,and 30 m2/m3,the values of the canopy permeability K are 0.25-25.00,0.06-6.25,and 0.03-2.78 m2,respectively;4) The viscous resistance of the mature lettuce is 25,inertial resistance factor is 1.3.Keywords：wind tunnel;lettuce canopy;porous media;resistance coefficient;permeability;momentum loss coefficient24|9|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：With respect to problems including lack of automation and poor spraying quality due to varying speed existing in high-clearance sprayer,an automatic speed control system was developed for the high-clearance sprayer of LOVOL ARBOS by investigating its transmission mechanism and characteristics in speed control based on mechatronic control methods.A speed control method was used to control the speed executor based on proportion-differential algorithm to realize automatic adjustment of the vehicle speed.Field tests showed that the newly developed automatic speed control system could control the power output of the HST driving system to realize the desired speed.The maximum speed errors were 0.05,0.10 and 0.10 m/s when the desired value was set to 0.21,0.83 and 0.94 m/s,respectively indicating that the system could meet requirements for speed control of the high-clearance sprayer.Keywords：high-clearance sprayer;moving speed;automatic control;electric putter24|7|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at the problem of poor uniformity of fertilizer flow in external groove wheel fertilizer apparatus,an arc gear fertilizer apparatus was designed.Based on the theoretical analysis of the structure of the fertilizer wheel,the mathematical model of the fertilizing amount was established,and the working parameters affecting the fertilizing amount of the fertilizer apparatus were determined when the structural parameters remained unchanged.Simulation experiment was designed to study the influence of parameters on fertilizing amount of arc gear fertilizer apparatus,the uniformity of fertilizer flow between arc gear fertilizer apparatus and external groove wheel fertilizer apparatus was compared;and verification test was designed to verify the reliability of simulation experiment.The results show that:1) Because of the gap between fertilizer regulating baffle and fertilizer dispensing wheel,fertilizer accumulation will slip,arc gear fertilizer apparatus didn't change the fertilizing amount.The length of the trough section regulated the fertilizing amount steadily,but the rotational speed of the wheel changed the fertilizing amount linearly,and there was a linear relationship between the rotational speed of the wheel and the flow rate of the fertilizing amount.2) The coefficient of variation of the flow rate of the arc gear fertilizer discharge device decreased by 30.14% on average compared with that of the external groove wheel fertilizer apparatus,and the uniformity of the fertilizer flow increased considerably.3) The relative error between bench test value and discrete element simulation value was less than 2.5%.The results of discrete element simulation are reliable.Keywords：fertilizer apparatus;arc gear;discrete element method;simulation;fertilizer flow23|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to expand the applications of bamboo cellulose,the green food packaging materials of bamboo cellulose reinforced composite membranes were fabricated with bamboo residue as raw material.Bamboo cellulose was prepared by the combination of sulfuric acid hydrolysis and ultrasonic wave dispose,and it was used as reinforcing material to prepare two kinds of composite membranes with chitosan and carboxymethylcellulose,respectively.The results of scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) showed that the bamboo cellulose was rod-shaped,about 500 nm in diameter and 500-600 μ m in length,and the bamboo cellulose retains the characteristic functional group structure of cellulose.The physical properties of the two membranes were measured.The results showed that the surface roughness of the composite membranes increased with the increase of bamboo cellulose content,and the moisture permeability and light transmittance of the composite membranes decreased.The test results of mechanical properties of the two kinds of composite membranes were as follows:With the addition of bamboo cellulose,the tensile strength of the composite membranes was increased,the tensile modulus of the composite membranes was increased,and the elongation at break of the composite membranes was decreased,indicating that bamboo cellulose could be used as a better reinforcing material.The addition of bamboo cellulose greatly improved the physical properties of chitosan-bamboo cellulose composite membranes.Chitosan-bamboo cellulose composite membranes could be used as food packaging materials.Keywords：bamboo residue;bamboo cellulose;chitosan;carboxymethylcellulose;membrane performance23|8|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Focusing on problems of high distribution costs and energy consumption of cold chain logistics industry,an optimization model for multi-objective distribution paths was established based on carbon emission,total distribution cost,and custom satisfaction in this study.By using distribution methods addressing fuzzy time window and adaptive catastrophe genetic algorithm,the path planning of the cold chain logistics vehicles and the multi-objective path optimization with complicated path choices during realistic distributions were investigated.The results showed that:1) Comparing to ignoring carbon emission,the inclusion of carbon emission in the model reduced by 56% in the objective function;2) Including carbon emissions and customer satisfaction,the model could obviously reduce the distribution costs and reach the global optimization while balancing multi-objectives effectively;3) The proposed algorithm outperformed the traditional genetic algorithm for solving multi-objective cold chain logistics path optimization problem in terms of optimization search and calculation time.Keywords：logistics engineering;multi-objective optimization;adaptive catastrophe genetic algorithm;path optimization;fuzzy time window24|9|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To determine the spatial layout of Kunming,the land ecological suitability of Kunming is evaluated and divided by using the minimum cumulative resistance model and the spatial analysis method of ArcGIS.The results show that:1) The area of ecological protection core area of Kunming is 7 032.11 km2,accounting for 34.75% of the total area.Basic farmland protection areas and ecological red line protection areas play an important role in ensuring food security,maintaining biodiversity and water conservation;2) Kunming's production ecological protection and conservation area is 4 444.31 km2,accounting for 21.15% of the city's total area,which is concentrated in Dongchuan District,Xundian County,Luquan County and Fumin County in the north;3) The area of production ecological expansion area is 7 711.87 km2,accounting for 36.70% of the city's total area,which is mainly distributed in the periphery of the construction and development zone,including the southwest of Luquan County,the northeast and southwest of Fumin County,southwest of Xundian County,east of Dongchuan District,southeast of Shilin County,Jinning County,Xishan District,etc.;4) The core area of construction and development is 1 554.98 km2,accounting for 7.4% of the city's total area,which is mainly distributed in the urban core area of Kunming.This study combines the anti-planning method with the minimum cumulative resistance model to provide reference for the spatial planning layout of Kunming.Keywords：ecological suitability of land;minimum cumulative resistance model;anti-planning;land use23|7|8<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the data of land use in 1980,1990,1995,2000,2005,2010 and 2015,this paper studied the wetland landscape fragmentation and restoration priority in Zoige County.By using ArcGIS and Fragstats softwares,the spatial distribution information of landscape fragmentation and wetland transfer were obtained to realize the wetland landscape fragmentation and the fragmentation dynamic evolution in Zoige.A wetland landscape evolution function was built and the distribution of wetlands changes in Zoige County was revealed.The priority of wetland restoration in this study area was then given.The results showed that:1) The wetland landscape fragmentation in the study area was mainly manifested by the shrinkage of mean patch size and contagion index and the increase of patch density and Shannon diversity index.During the study period,the mean patch size of study area decreased by 249.77 hm2 and the patch density increased by 0.013 hm-2.2) According to the spatial meaning of land use dynamic change,the wetland in the study area was divided into four types which were stable type,degraded type,restored type and fluctuating type.It was found that compared with the stable wetland,the area of degraded wetland was 75.43%,which was 2.27 times larger than that of the restored wetland.The Zoige wetland was seriously degraded and needed to be restored urgently.3) By using the method of entropy and taking the administrative township as the restoration unit of Zoige wetland,it was concluded that there were two one-level restoration areas,three two-level restoration areas and three three-level restoration areas in eight affected towns of Zoige County.The three-level restoration areas (Axi,Nenwa and Dazhasi towns) should be given priority for restoration.This study provides a reference for the spatial and temporal sequence of wetland restoration in Zoige County and it also provides a rapid assessment method for wetland restoration assessment.Keywords：wetland landscape evolution function;entropy method;landscape fragmentation;wetland restoration26|8|10<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The trend of drought was analyzed in China's major grain producing areas during the period from 1949 to 2016 using the trend line method and Mann-Kendall non-parametric test method.The objective was to provide a theoretical basis for reducing drought risk and disaster losses in major grain producing areas.The results showed that:1) The incidence of drought was higher than 60% except for Jiangsu Province.The variation coefficient of drought disasters was higher than 50%.2) The M-K trend test results show that the ratio of affected area was increasing in Heilongjiang,Inner Mongolia,Jilin and Liaoning provinces,but Anhui Province had a significant decreasing trend.The ratio of suffering area was increasing in Heilongjiang,Inner Mongolia,Jilin,Liaoning,Hebei,Jiangsu,Hubei and Sichuan provinces.The trend was not significant in the other provinces of main grain producing areas.3) The results of M-K mutation test also showed that the mutation point of the ratio of affected area in Anhui Province was in 2002,and it showed a decreasing trend after 2002.The mutation point was respectively 1977,1970,1983 and 1977 in Heilongjiang,Jilin,Liaoning and Inner Mongolia.It showed an increasing trend thereafter,and the ratio of affected area increased significantly since 2000.The mutation point of the ratio of suffering area was respectively 1988,1977,1981,1984,1961,1978,1986 and 1975 in Heilongjiang,Jilin,Liaoning,Inner Mongolia,Hebei,Jiangsu,Hubei and Sichuan provinces.The ratio of suffering area increased drought rate significantly from the late 1990s to 2010.Keywords：main grain producing area;drought;the ratio of affected area;the ratio of suffering area;trend23|7|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the survey data of Heilongjiang,Sichuan and Anhui provinces,the farmers' cognition of the minimum purchase price policy and the decreasing of minimum purchase price were analyzed first,and the impact of decreasing the minimum purchase price on farmers' rice planting area is then analyzed based on the perspectives of small farmers and scale households.The change of rice planting area of farmers is analyzed finally if the minimum purchase price policy is cancelled.The results show that farmers have a higher understanding of the minimum purchase price policy,while scale households have a significantly higher understanding of the decrease of the minimum purchase price than small farmers;The decrease of minimum purchase price has a significant positive effect on the reduction of rice planting area.On the return of small farmers and scale households,it is found that the decrease of minimum purchase price has a significant positive impact on the reduction of rice planting area of small farmers,but displays no significant impact on scale households.If the minimum purchase price was cancelled,the willingness of scale households to reduce rice acreage would be stronger than that of small farmers.Keywords：minimum purchase price;planting area;small farmers;scale households23|7|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the agricultural trade data of 65 countries along the "Belt and Road" in 2008-2016,the overall agricultural products trade network is constructed.Network density,centrality,block model and QAP method are adopted to analyze the overall agricultural products trade network and its influencing factors.The results showthat:1)The overall network density and reciprocity of agricultural products trade increase by 6.9% and 6%,respectively;2)These countries presents a "core-edge" structure,while China is at the center;3)The signing of the FTA (Free Trade Agreement) is the main factor to promote the formation of agricultural trade relations.Keywords：the “Belt and Road”;agricultural trade network;block model;QAP method24|7|7<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To analyze the impact effect of moderate land-scale operation (MLSO) on international competitiveness in agricultural production of rape planting,based on the theoretical analysis of the judgement on MLSO,this study adopted difference in deference (DID) model to analyze its impact,changing tendency and main impact factors of MLSO depending on the survey data from 360 households (2013-2017 annual) in Hubei Province.The result shows that:MLSO can promote the international competitiveness of rape planting in China.The impact effect of MLSO to the international competitiveness of rape planting in China is stable in tendency.The main impact factors of MLSO to the international competitiveness of rape planting in China are input of labor and total cultivated land scale of a household.In conclusion,during Policy formulation,the government may pay close attention to actively encourage various forms of MLSO to households and explore the countermeasures of the negative effects in international competitiveness from over labor-input in rape planting.Keywords：rape planting;international competitiveness;moderate land-scale operation;effect;difference in deferencemodel23|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Through international market share,trade competitiveness index,Revealed Comparative Advantage Index (RCA Index),intra-industry trade index,the international competitiveness of Chinese rabbit industry is measured;The factors affecting the international competitiveness of the rabbit industry are analyzed in terms of cost,price and market demand.It is found that the international market share of Chinese rabbit industry is high,the trade competitiveness index performed well,and RCA is at the end.By useing the factor analysis method,a total of three indicators are integrated into the international competitiveness comprehensive index.It is found that the Chinese rabbit industry is listed has performed well in the early 21st century,but is ranked the last of the major rabbit-producing countries in recent years.The intra-industry trade index of Chinese rabbits increased year by year,and the degree of intra-industry trade has became higher and higher.China has a disadvantage in feed costs,but has an advantage in labor costs;At the demand side,the domestic demand for rabbit products is small,which is not conducive to the international competitiveness of the rabbit industry.In the end,suggestions on promoting standardization,optimizing the industrial structure,promoteing industrial upgrading for the rabbit industry and actively exploiting rabbit products market are proposed.Keywords：rabbit industry;international competitiveness;Revealed comparative advantage index(RCA Index);diamond model23|8|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the impact of rural financial innovation on rural economic development,the difference between rural financial innovation and rural financial development is investigated by taking national rural financial comprehensive reform pilot area of Jilin province as the sample,and using the data of 39 county of Jilin province in 2000 to 2015.OLS,static and dynamic panel analysis method are adopted to investigate the mechanism of rural financial innovation on rural economic development.The results show that:The rural financial innovation plays a significant role in promoting rural economic development and displays diminishing income effect.Therefore,in order to promote economic development and revitalize rural areas,it should strengthen the rural financial innovation,especially in poor and backward areas,should be strengthened.It is required to solve the problem of information asymmetry between rural financial institutions and rural economic subjects,establish mechanisms to share innovation risks,reduce innovation costs and increase innovation incentives.Keywords：rural revitalization strategy;rural finance innovation;rural finance development;rural economic development24|8|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
