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- Abstract：In order to study the influence of geological background on land resource utilization in the Western Mountain Areas of Beijing from the aspects of strata and rock property, geological structure, landforms and geochemistry, the related data of geological background and land resources utilization in the Western Mountain Areas are obtained through literature review and field surveys. Sample tests and comparative analysis are performed. The results show that: 1)The unique rock resources in the Western Mountain Areas lead to the emergence of corresponding industrial and mining land, which is also an important material basis for tourism resources; 2)Due to the uplift of tectonic movement, the land type in the Western Mountain Areas is mainly forested land, and corresponding tourist land and construction land appear in the scenic areas; 3)Shidu Scenic Spot and Stone Flower Cave, as typical karst landforms, have become the famous tourism resources in the country, followed by sanatoriums, training bases, holiday villas and other construction land. Good quality cultivated land has formed on both flood plain and river terrace; 4)The soil developed with specific lithology in Miaofeng Mountain of Mentougou District, special area of Fangshan District makes the high-quality rose garden land of the Miaofeng Mountain and the persimmon orchard of Fangshan District in Beijing.Keywords：geological background;topographic features;geological structure;land resource utilization;the Western Mountain Areas of Beijing3|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the relationship between land use landscape pattern change and runoff in the landscape level and patch type level, the landscape pattern index analysis method and statistical analysis method were carried out based on the land use data and measured runoff data of the Yihe River Basin. The results showed that: 1)From 1961 to 2015, the fluctuation and decline trend of annual runoff was more significant than that of annual precipitation. This indicated that the annual runoff change was not only affected by precipitation, but also by human activities such as land use change. 2)From 1975 to 2015, the land use type of basin was mainly cultivated land, followed by forest land, construction land and grassland, which accounted for a large proportion, followed by water area, with the least area of unused land; Land use change was mainly manifested in the rapid decline of cultivated land and grassland, the rapid increase of construction land and forest land, and the increase of water area and unused land to varying degrees. The landscape pattern of the watershed was more fragmented, the patch shape tended to be complex, the connectivity tended to be weakened, and the landscape heterogeneity increased. 3)At the level of plaque type, the correlation between runoff and NP and PD was small. With the increase of the degree of plaque fragmentation, there was a weak trend of decreasing first and then increasing; The correlation between runoff and COHESION was also small, and there was a strong correlation between runoff and LPI. With the increase in patch connectivity and the abundance of dominant species, it showed a trend of increasing first and then decreasing. At the landscape level, the runoff was significantly correlated with SHDI, LSI and CONTAG, and runoff was not significantly correlation with DIVISION. With the increase of landscape type diversity, patch shape complexity, patch aggregation and landscape segmentation, runoff showed a trend of increasing first and then decreasing.Keywords：Yihe River Basin;land use change;landscape pattern;runoff;correlation2|9|7<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To provide an important decision basis for the sustainable development of land and ecology in Shaanxi Province, the spatial-temporal evolutions of land use and ecosystem service values are explored. Based on the interpretation data of satellite remote sensing land use in 1980, 1990, 2000, 2010 and 2018, the spatial-temporal evolution characteristics of land use and ecosystem service values in Shaanxi Province from 1980 to 2018 are analyzed by using ecosystem service value dynamic evaluation model and land use change dynamics index, sensitivity index, eco-economic harmony index. The correlation and coordination between ecosystem service values and socio-economic development are investigated. The results show that: 1)From 1980 to 2018, the area of forest land, grassland and construction land increased, while the area of cultivated land, water area and unused land decreased. The change speed and amplitude of each type of land use are obviously different, and the transfer between different land use types is frequent; 2)Over the past 40 years, the total value of ecosystem service in Shaanxi Province has increased by 59. 094 billion yuan showing a trend of fluctuations increasing. The value of ecosystem services generated by forest land is the largest, and the value of ecosystem services of supporting and regulating functions is much greater than the of supply and cultural functions; 3)From 1980 to 2018, the overall eco-environment and economic development of Shaanxi Province are in a low degree of coordination. Therefore, more attention should be paid to strengthen the protection of eco-environment and improve the degree of eco-economic coordination.Keywords：Shaanxi Province;land use change;ecosystem service value;social economy4|9|9<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to improve the soil characteristics of tobacco field with yellow brown soil in Qinba mountain area, and reduce the effect of seasonal drought on the growth of flue-cured tobacco, taking no super absorbent polymer as control, potassium polyacrylate(K-PAM), polyacrylamide(PAM)and potassium humate(KHm)super absorbent polymers respectively were applied before ridging, the effects of different super absorbent polymers on soil bulk density, soil moisture and the growth, conventional chemical composition, economic characteristics of flue-cured tobacco were monitored. The results showed that K-PAM and PAM decreased soil bulk density in 0-40 cm soil layer, and increased soil moisture in 0-40 cm soil layer during tobacco flourishing growth stage. The content of conventional chemical components in flue-cured tobacco can be improved by different super absorbent polymers, among which KHm significantly reduced the ratio of sugar to nicotine and the ratio of nitrogen to nicotine of the flue-cured tobacco. K-PAM increased the yields, output value, the proportion of superior tobacco and the net output value, while PAM and KHm decreased the net output value of flue-cured tobacco. Therefore, it is suggested that K-PAM should be used in the tobacco field with yellow brown soil in Qinba Mountain area.Keywords：super absorbent polymer;soil bulk density;soil moisture;growth of flue-cured tobacco;quality of flue-cured tobacco5|12|13<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on MODIS data, four remote sensing drought indexes(temperature vegetation drought index(TVDI), vegetation water supply index(VWSI), vegetation condition index(VCI)and temperature condition index(TCI))during the main growth period of crops(May-August)in the Hetao irrigation area from 2000 to 2018 are investigated. The relationship between the four drought indexes and their correlations with the relative water content of 0-20 cm soil, precipitation and irrigation water diversion are analyzed. The results show that: The correlation between TVDI and soil relative water content is better than the other three remote sensing drought indexes through correlation analysis; In the irrigation area with more irrigation water, the correlation between remote sensing drought index and rainfall is weak. However, there is a certain correlation between TVDI and irrigation water volume. Through the analysis, it is found that TVDI has a good applicability in Hetao irrigation area. In addition, the comprehensive use of various drought indexes in drought monitoring is of great significance to improve monitoring accuracy and predict drought scientifically and reasonably.Keywords：Hetao irrigation area;MODIS data;temperature vegetation drought index;vegetation water supply index;vegetation condition index;temperature condition index3|9|16<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to investigate the yield component and optimum fertilization condition of Pinellia ternate planting in Guizhou Province. Peach-leaf type P. ternate variety was used as material. The correlation analysis, path analysis of main agronomic traits and ‘3414' fertilization analysis were conducted. The results showed that: 1)The diameter of tuber, plant height, length of main leaf and the diameter of petiole were most correlated with high yield. The diameter of tuber and length of main leaf contributed most to high yield, then the plant height and the diameter of petiole. 2)Because of the high level of nitrogenous content existed in soil in Karst region of Guizhou Province, the optimum fertilization formula of P. ternate was set at 10 kg/667 m2 phosphate fertilizer and 12 kg/667 m2 potash fertilizer. 3)Under the optimum fertilization condition, the average yield of ‘Space No. I' was over 350 kg/667 m2. In all, the yield components of P. ternate were higher tuber diameter, lower main leaf length, higher plant height and larger petiole diameter size. The suggested application amount of nitrogenous fertilizer for P. ternate planting in Karst region of Guizhou Province was suggested within the range of 0-10 kg/667 m2.Keywords：Pinellia ternata;yield component;the optimum fertilization condition;Karst cool-temperature region3|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To analyze the potential ecological problems in Nanchang and understand the spatial differentiation law of ecological sensitivity, soil erosion, habitat, geological hazard and water ecology were selected to establish an ecological sensitivity evaluation system. Based on ArcGIS 10. 2, the weights of factors were obtained through the objective weighting method of coefficient variation. The barrel principle was used to solve the comprehensive applicability of indicators, and the weighted superposition method was used to conduct comprehensive evaluation. The results showed that the overall level of Nanchang's ecological sensitivity was high. Water ecology and the geological disasters were the main sensitive types. The highly sensitive area was the most widely distributed, which were mainly distributed in the central and eastern regions. Its water network was dense and the mountainous were in the northwest accounting accounted for 43. 79% of the total. Insensitive area came second, which were mainly distributed in the plains of the central and western regions of Nanchang City accounting for 26. 93% of the total. The moderately sensitive area and slightly sensitive area were adjacent to the highly sensitive area, which were distributed in strips and planar, accounting for 14. 56% and 14. 72% of the total area of Nanchang City, respectively. In conclusion, the evaluation results reasonably reflect the spatial differentiation law of ecological sensitivity in Nanchang, which can provide a theoretical basis for the optimal allocation of land space in Nanchang City.Keywords：Nanchang City;ecological sensitivity;variance coefficient method;barrel principle;spatial differentiation2|10|12<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Light quality and nitrogen content are both key factors in celery growth and development, appropriate combination of light and nitrogen promotes celery seedling quality. In order to optimize celery seedlings culture, celery seedlings were exposed to two kinds of light quality(White light, W; Blue light, B)and two kinds of nitrogen contents(8 mmol/L KNO3, high nitrogen, H; 4 mmol/L KNO3, low nitrogen, L), WH was used as control. The effects of light-nitrogen interaction on the celery growth, physiological metabolism and nutrient accumulation of celery seedlings were investigated. The results showed that: Compared with WH, WL and BH treatments significantly decreased whole plant dry weight by 43. 18% and 55. 07%, respectively. WL treatment also significantly reduced nitrate, soluble protein and total free amino acid contents in celery leave and petiole. BH treatment significantly increased nitrate, soluble protein and nutrient contents in leaves and petioles, whereas the treatment significantly decreased the contents of soluble sugars, amino acids of alanine group and serine group in leaves. BL treatment significantly increased whole plant dry weight by 32. 18%, enhanced nitrate and soluble protein contents in leave, and histidine(His)and proline(Pro)contents in petiole when compared with WH. The results of comprehensive evaluation of celery growth and development with membership function analysis indicated that BL treatment was the best among all treatments. In conclusion, the combination of blue light and low nitrogen content increased plant dry weight, soluble protein and free amino acid contents, and finally promoted celery seedling growth and development.Keywords：light quality;nitrogen content;celery;free amino acid;nutrient4|10|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In view of the problem of low utilization rate of chicken manure, the effects of applying three different chicken manure fermented organic fertilizers(Homemade organic fertilizer(T1), imported organic fertilizer(T2)and domestic organic fertilizer(T3))on the growth, yield, quality of watermelon and silage maize and physicochemical properties of soil were investigated in this study. An inorganic compound fertilizer was used as control group. Their economic benefits were also estimated. The results showed that: 1)Three organic fertilizers significantly increased the SPAD value of the leaves of watermelon. Among them, T2 had the best promoting effect on the growth of watermelon, and it significantly increased the length of main vine and their number of branches. 2)T1 and T3 significantly improved the sensory quality of watermelon while T2 significantly increased the central soluble solids. 3)The application of these three fertilizers significantly increased the content of alkaline nitrogen, available phosphorus and available potassium of soil, among them, T2 significantly reduced soil pH. 4)The application of these three fertilizers significantly increased the plant height, number of green leaves and fresh grass yield of silage maize. The contents of crude protein, crude fat and relative feeding value were increased while the contents of acid detergent fiber and neutral detergent fiber were reduced. 5)T1 and T3 could improve economic efficiency, of which T1 had the largest increases and increased by 21. 42%. In conclusion, the homemade organic fertilizer had more advantages than the other two kinds of organic fertilizers and it could be used as the local promotion fertilizer.Keywords：chicken manure;organic fertilizer;watermelon;silage maize;growth;yield;quality8|11|7<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study was conducted to evaluate the effects of antioxidants combination on stallion sperm quality during freeze-thaw process. Sperms of ten stallions(3 or 4 individuals each time)were diluted into different levels of glutathione(0, 5. 0, 7. 0, 10. 0, 20. 0 mg/mL), trehalose(0, 25. 0, 35. 0, 50. 0 mg/mL), and the combination of glutathione and trehalose((0+0), (5. 0+35. 0), (5. 0+50. 0), (7. 0+35. 0), (7. 0+50. 0)mg/mL), which were supplemented with INRA82 extender and then subjected to cryopreservation. Sperm motility(TM), progressive motility(PM), plasma membrane integrity(MI), acrosome integrity(AI)and its malondialdehyde(MDA)content, activities of superoxide dismutase(SOD), catalase(CAT), glutathione peroxidase(GSH-PX)and glutathione reductase(GR)were investigated by sperm normal quality test and enzyme linked immunosorbent assay(ELISA). The results showed that: 1)In 5. 0 mg/mL glutathione group, the TM, PM and MI were higher than that in other groups, MDA level was lower than that in other groups, and addition of glutathione significantly improveed the activity of CAT and GSH-PX(P<0. 05). In 35 and 50 mg/mL trehalose groups, TM, PM, AI and MI were higher than that in other groups, and 35. 0 mg/mL trehalose significantly reduceed MDA content(P<0. 05); 2)The combination of glutathione and trehalose(5. 0+35. 0 mg/mL)significantly increaseed TM, PM, AI, and MI(P<0. 05), significantly reduceed MDA content(P<0. 05), and improveed the activity of SOD and GSH-PX. In conclusion, the combined addition of 5. 0 mg/mL glutathione with 35. 0 mg/mL trehalose protected the sperm from oxidative stress in a certain extent by changing the enzyme activity, thus improving the semen quality after frozen-thawed.Keywords：Mongolian horse;spermatozoa;cryopreservation;antioxidants;antioxidant activity8|11|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the composition and function of gut microbiome of grazing Mongolian cattle during winter in Xilin Gol, Inner Mongolia, fecal samples were collected from grazing Mongolian cattle(female, n=20)in the same region in winter(November, December and January of the following year). The diversity of intestinal flora was analyzed and function prediction of PICRUSt was performed by 16S rRNA sequencing. The results showed that 90 075 sequences were measured in average for each sample of the 60 samples, and 3 975 operational taxonomic units(OTU)were obtained through clustering. The 84. 60% OTU were annotated to phyla level and 29. 56% OTU were annotated to genus level; The Firmicutes, Bacteroidetes, Bacteroides and Akkermansia were dominant in the gut of grazing Mongolian cattle in winter at the phyla and genes levels, respectively; With the cold weather and food shortage, the number of Firmicutes in the gut of Mongolian cattle decreased, while that of Bacteroidetes increased; The clustering analysis showed that the gut microbial communities of Mongolian cattle in November and December were similar, while there was significantly different from that in January of the following year; The function prediction by PICRUSt showed that with the weather becoming cold, the abundance of pathways related to Immune system, environmental adaptability and cell motility decreased and the abundance of amino acid metabolism pathways increased. In conclusion, the intestinal flora of Mongolian cattle plays an important role in adapting to the food shortage in winter.Keywords：Mongolian cattle;season;gut microbiota;high throughout sequencing5|9|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to study the P-gps gene expression level of the third stage larvae of Nematodirus oiratianus resistant to ivermectin, RT-qPCR was used to detected the expression level of P-gps gene mRNA at low and high concentrations of ivermectin after 0, 3, 6, 12 and 24 h treatment, respectively. The results showed that the P-gp-1 gene was not expressed at different time points under two concentrations of ivermectin; The expressions of P-gp-2, P-gp-3 and P-gp-11 genes were increased significantly with the prolongation of drug treatment time, and reached the peak at 12 h. The expression of P-gp-9. 1 gene was increased significantly by 4. 71 times at 3 h under the treatment of low concentration drug and the expression level of P-gp-12 gene was very low all the time. However, the P-gp-12 gene expression was gradually increased at a high concentration with the increase of time. In conclusion, P-gp-2, P-gp-3, P-gp-9. 1, P-gp-11, and P-gp-12 gene were over-expressed at some time points after the treatment of the third stage larvae with ivermectin resistant drugs. This study provided basic data for the study of resistance mechanism and the establishment of molecular detection method of resistance of N. oiratianus.Keywords：sheep;Nematodirus oiratianus;Ivermectin;resistance;P-gps;gene;RT-qPCR2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to meet the demand of fertilizer in different growing periods and improve the utilization rate of fertilizer, a kind of layered fertilization boot was designed. According to the material characteristics of fertilizer particles, soil particles and the design requirements of layered fertilizer particles in soil, the key parameters of each part of the layered fertilization boot were calculated theoretically. SolidWorks software was then used to generate layered fertilization boot with different structures, which were imported into EDEM software for simulation test. The test results showed that the number of round bar had an extremely significant effect on the layered effect(P<0. 01), the traveling speed had a significant effect on the layered effect(P<0. 05), and the diameter of round bar had no significant effect on the layered effect(P>0. 05); As the standard to measure the effect of fertilizer layering, the variation coefficient of the distance between the upper and lower layers of fertilizers was 4. 57%; Under different fertilization application conditions, the ratio of the upper and lower layers was 4∶6; The upper layer fertilizer particles were located between 10-15 cm beneath the surface and the lower layer fertilizer particles were located between >15-20 cm beneath the surface. The upper and lower layer fertilizer spacing was about 5cm and the relative error between the simulation value and the test value of variation coefficient is less than 4%, which proved that the discrete element method was feasible to optimize the parameters of the layered fertilization device. This study provided references for the improvement of the precise layered fertilization machine, and had certain significance for promoting Xinjiang's precise weight loss.Keywords：layered fertilization;discrete element method;parameter optimization;computer simulation;fertilizer distance between upper and lower layers2|22|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to solve the error caused by the bias load in the experiment of planting grass disc, the influencing factors and the regularity of the resistance to the longitudinal grass inserting in the vertical direction during the mechanized straw checkerboards laying are studied by combining discrete element method simulations and experiments. Theoretical analysis of grass stalk movement is conducted. The results show that: A formula is obtained for calculating the difference between the time when a single straw is rolled down by the inserted disc and the starting time of two adjacent straws, and the number of straws that the disc touches in one exercise cycle is calculated and the quantitative relationship between the translational speed of the vertical direction of the straws and the forward speed of the disc is investigated. A self-designed soil test device is used to perform a vertical straw inserting test, and the initial angular velocity and acceleration of the straw rotation are calibrated. A three-dimensional model of straw-sand soil was established by using the discrete element method, and the process of inserting the straw by the disc was simulated. The simulation results showed that: 1)The result of theoretical analysis on straw motion confirmed that the 3D model is suitable for the dynamic process of grass insertion by discrete element simulation; 2)When the disc's forward speed is in the range of 4-10 cm/s, it will hardly affect the steady-state grass insertion resistance in the vertical direction; 3)The resistance of straw insertion in the vertical direction of the disc increases with the increase of the laying density of straws. In conclusion, this study reveals the quantitative relationship between the law of the straw's movement and the forward speed of the disc during the rolling process of disc insertion. Based on the experimental calibration parameters, the effects of disc speed and straw lay density on cutting resistance are obtained through simulation.Keywords：inserting straws;disk blade;straw checkerboards;discrete element method2|11|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A pneumatic unloading device of soybean combine harvester was designed to solve the problem of high grain crushing rate in the unloading process of traditional screw conveyor of soybean combine harvester. Three factors and three levels response surface tests were carried out. The rotate speed of impeller, rotate speed of fan and unloading hose inner diameter were taken as test factors and the crushing rate and unloading efficiency were test indexes. The results showed that: The influential level of the three factors on crushing rate in descending order was the rotate speed of fan, rotate speed of impeller and unloading hose inner diameter and on grain unloading efficiency in descending order was the rotate speed of impeller, unloading hose inner diameter and rotate speed of fan. Through multi-objective parameter optimization analysis, the working parameters suitable for pneumatic grain unloading were the rotate speed of impeller 15 r/min, rotate speed of fan 3 166 r/min, unloading hose inner diameter 100 mm. Under this condition, the average value of crushing rate and unloading efficiency were 1. 49% and 1. 3 L/s, respectively. In conclusion, the pneumatic unloading device effectively reduced the damage to soybean caused by the unloading process of combine harvester.Keywords：soybean;combine harvester;grain unloading;pneumatic conveying2|9|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to find the best combination of working parameters of grain hardness test method based on indentation loading curve, the natural dried peas were taken as the test object, and the optimization analysis of working parameters of indentation loading curve test method was carried out. The roughness of taper, the taper of the four pyramid indenter and the hardness of the indenter were taken as independent variables. The starting point ratio(Y1)and the distance ratio(Y2)of the linear section of the indentation curve were adopted as response values. Based on the Box-Behnken test design principle, the Design-Expert data processing software and three factors and three levels response surface analysis method were used to explore the test factors and their interaction. The results showed that: The significant level of Y1 regression model was P<0. 000 1, and the lack of fit item was P>0. 05; The significant level of Y2 regression model was P=0. 000 6, and the lack of fit item was P>0. 05. The regression model of Y1 and Y2 were extremely significant, but the lack of fit item was not significant. The fitted quadratic regression equation was consistent with the actual situation; The response level in descending order of the three factors to the test performance parameters Y1 and Y2 was: Indenter taper, tip roughness and indenter hardness.Keywords：grain hardness;indentation;loading curve;response surface4|14|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the panel data of the main provinces producing pork, poultry, beef and mutton from 2000 to 2017, the short-term and long-term supply elasticities of various meats are estimated and compared by Nerlove model. In addition, the influence and difference of livestock and poultry prohibition policy on different meat supply were also studied. It is found that the short-term supply elasticity of pork, poultry, beef and mutton is lack of elasticity, but in the long run they are full of elasticity. Moreover, among the four kinds of meat, the short-term supply elasticity of poultry is the largest, followed by pork, and the short-term supply elasticity of beef is the smallest. The results also suggests that pork, poultry, beef and mutton are not substitutes for each other, that is to say, the output of one meat product is not significantly affected by other meat price changes. In addition, the supply of pork, poultry and beef is significantly affected by the policy of banning livestock and poultry, of which the supply of poultry is the most affected, followed by pork and beef. The output of mutton is not significantly affected. On the basis of above results, this study puts forward some policy suggestions, such as formulating supporting policies to promote the production of animal husbandry in the long term, and strengthening the monitoring of animal production in the short term. Furthermore, different measures should be taken to stabilize the supply of different kinds of meat, improve the policy of banning livestock and poultry, balancing the environment and supply in case of the change of meat prices.Keywords：the supply of meat;product heterogeneity;policy of prohibiting livestock and poultry production;Nerlove model5|9|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To understand the basic situation of rural homestead resources in China, based on the available official statistical data of rural residential area and current land use area of villages from 2009, this study constructs the estimation method of total amount of rural homestead resources, focuses on the analysis of spatial distribution, change trend and utilization characteristics of rural homestead resources in China from 2009 to 2019. The results show that: 1)The total amount of rural homestead in China is about 9. 339 8 million-11. 941 3 million hm2. The total amount of rural homestead area of village is higher than that of marketing town, and that is East area>West area>Middle area>Northeast area. The differences among provinces are obvious. 2)The total amount of rural homestead keeps increasing first and then decreasing, and the growth rate of total homestead in marketing town is higher than that of village. The overall situation is West area>East area>Middle area>Northeast area. In the future, under the multiple influences of economic factors, management factors and planning factors, it will maintain a downward trend; 3)Over occupation building and idle rural homestead are two important characteristics of homestead utilization, and the main reasons are the unclear cognition of farmers, inadequate planning and management and the aggravation of rural population flow. In the future, the monitoring and management of rural homestead resources can be realized through the construction of homestead statistics and monitoring system, so as to provide basic data support for the goal of homestead system reform.Keywords：rural homestead;estimation method of total amount of rural homestead;per household homestead area;idle proportion of homestead3|11|8<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The generalized Dig index exponential decomposition(GDIM)was used to examine the driving factors of agricultural carbon emissions in China from 1985 to 2017, and a dynamic policy scenario was set up to simulate and predict the national agricultural carbon emissions from 2018 to 2030 based on factor contribution differences. The study found that: The scale of fiscal expenditure was the primary factor leading to the growth of carbon emissions, the intensity of fiscal expenditure and output strength were the key factors contributing to the decline; In terms of time period, the growth of China's carbon emissions from 1985 to 2010 was expressed as “Driven by the scale of output value” to “Produced by production expenditure”. After 2010, an alternate inter-annual increase and decrease under the “Policy regulation effect”; In the dynamic scenario forecast, the policy regulation scenario and the green low-carbon scenario will reach peaks on 2025 and 2020, respectively. At the peak, the total carbon emissions in the high-speed development scenario and the green low-carbon scenario in 2030 will be close to 1 billion tons. Thus it can be seen that promulgating the policy measures of “reward and compensation” and “regulation”, optimizing the structure of agricultural production input with the help of the market, and increasing the utilization rate of agricultural consumables are long-term measures to promote low-carbon production.Keywords：agricultural carbon emissions;agricultural fiscal expenditure;generalized dimorphic exponential decomposition;dynamic scenario simulation;peak prediction3|9|20<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the panel data of 26 cotton areas in China, the United States and India from 1998 to 2017, this study uses DEA Malmquist method to measure the total factor productivity(TFP)of cotton, and then uses Dagum Gini coefficient and its decomposition method to analyze the differences and sources of cotton TFP in the three countries. On this basis, the convergence of cotton TFP is also analyzed. The results show that: From 1999 to 2017, China's cotton TFP of has obvious volatility, but the overall growth is negative, which lags behind the United States and India; There are differences in the growth of cotton TFP in China's three major cotton regions; The Yellow River basin has the highest growth rate, but it is still negative growth, and the northwest inland cotton region has the most advantage in pure technical efficiency; The overall difference of TFP among China, the United States and India displays a trend of narrowing, but the fluctuation characteristics are obvious; The differences between countries are the main sources of the differences in TFP of cotton regions; On the whole, there are α convergence and absolute β convergence in the growth rate of TFP, but there is no conditional β convergence, but the national differences in convergence are obvious.Keywords：cotton;TFP;high quality development;Dagum Gini coefficient;convergence3|10|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to explore the role of farmers' professional cooperatives in rural poverty reduction and the mechanism of income increase of poor farmers, this study constructs a theoretical framework of poor farmers' participation in poverty reduction from the perspective of ability. Descriptive statistics, correlation analysis and path analysis based on field survey data are used to verify the intermediary effect between farmers' participation in cooperatives and income increase by three dimensions of farmers' ability: information acquisition ability, technology application ability and demand expression ability. The results show that: 1)The improvement of farmers' income not only depends on their capital participation and production participation, but also depends on the improvement of their individual ability; 2)Among the three dimensions of ability of poor farmers, the improvement of technology application ability has the greatest impact on their income; 3)To promote the stable and sustainable poverty reduction of members and the radiation driving role of cooperatives, while encouraging poor farmers to participate in cooperatives, more attention should be paid to improve farmers' abilities in all dimensions.Keywords：farmers' professional cooperatives;poverty reduction mechanism;member ability;path analysis1|8|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
