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- Abstract：In order to clarify the effect of extreme high temperature on maize production, the historical meteorological data of typical stations in Beijing-Tianjin-Hebei region from 1954 to 2015 were compared, and the APSIM model was used to simulate the effect of extreme high temperature on maize yield. The results showed that from 1954 to 2015, the number of days of extreme high temperature and that of high temperature accumulation(EDD)increased during the fertilization and fruiting period of summer maize in Beijing and Tianjin. Although there was no obvious increasing trend in Botou City, Hebei Province, the days of extreme high temperature and EDD in these two regions were higher from 2006 to 2015. The simulation results showed that compared with the threshold 30 ℃ simulation results, the decrease of maize yield in Beijing and Tianjin(>18. 6%)was higher than that in Botou City, Hebei Province(10. 7%)when the threshold was 35 ℃. The maize yield in Beijing and Tianjin decreased by more than 14. 3%, which was much higher than that in Botou City, Hebei Province(6. 4%), and it was mainly affected by the high temperature of 30-32 ℃. Therefore, in the future maize production, in order to further improve the maize yield, there is an urgent need for the combination of excellent high temperature resistant cultivation with high efficient management measures.Keywords：summer maize;extreme high-temperature;grain yield;crop model;Beijing-Tianjin-Hebei region11|13|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To clarify the regularity of lodging of stalk under ear after physiological maturity of summer maize, the specific position of stalk lodging under ear after the physiological maturity of the field to the harvest was investigated, and the relationships between the characteristics of maize plants and the occurrence position of lodging were analyzed. The results showed that: The proportion of each node increased first and then decreased with the increase of the node after the physiological maturity of Sichuan summer maize. It mainly occurred in the third, fourth and fifth nodes of the stalk base, accounting for 33. 86%, 34. 66% and 16. 33%, respectively; After the physiological maturity of summer maize in Sichuan Province, the stalk lodging mainly occurred in the area from 2. 0 cm in the lower part of each stalk node to 3. 5 cm in the upper part of each stalk node. In conclusion, under the conditions of this experiment, there was no significant correlations between the height, the node position of stalk lodging and plant height, ear height after physiological maturity.Keywords：Sichuan Province;summer maize;after physiological maturity;stalk lodging under ear;lodging node position2|12|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to explore the function of TaSPX3 in wheat resistance to leaf rust based on the discover that TaSPX3 expression was induced by leaf rust infection, BSMV-VIGS system was used to silence TaSPX3 in Chinese Spring and Zhengmai 9023. qRT-PCR was adopted to analysis the expression of disease resistant genes. The results showed that: The disease severity of leaf rust on BSMV∶TaSPX3 infected wheat leaves was aggravated, which indicated that the resistance to leaf rust was reduced after silencing TaSPX3 gene; The expression levels of diseases-resistance genes PR2 and CAT were significantly down-regulated in the leaves. In conclusion, TaSPX3 might be involved in wheat resistance to leaf rust fungus by regulating the expression of PR2 and CAT genes.10|13|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To better understand the function of cotton TCP genes in cotton fiber development, Gossypium barbadensse ‘Xinhai 21' was taken as study material, and cDNA sequence of GbTCP44 was obtained through RT-PCR technology. The structure and function of GbTCP44 were predicted by using bioinformatics methods, subcellular localization, and qRT-PCR technology. The results showed that: 1)The GbTCP44 gene has 1 035 bp open reading frame, which encodes 344 amino acids. Its molecular formula is C1618H2538N484O525S13 with a predicted molecular weight of approximately 37. 59 ku and a isoelectric point of 8. 83. The N-terminus sequence has a typical TCP conservative domain, which belongs to the Class I member of the TCP transcription factor family; 2)The GbTCP44 gene is a nuclear-expressing protein, which is expressed in the nucleus. The protein domain is highly conserved with other plant TCP proteins and has the closest relationship with Gossypium raimondii. 3)The expression of GbTCP44 gene in flower organs is significantly higher than that in vegetative organs; The expression level of this gene is the highest in cotton fibers at 20 d; When cotton fiber development reached 25 and 30 d, the expression level of the gene in long-fiber varieties is lower than that in short-fiber varieties, and there was a significant difference(P<0. 05), In conclusion, GbTCP44 gene might be involved in the development of fiber cell elongation during cotton fiber elongation.Keywords：Gossypium barbadensse;TCP transcription factor;subcellular localization;expression analysis1|12|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate whether palmitic acid(PA)in dairy cows in vitro can regulate the activation of inflammatory signaling pathway through autophagy, lymphocytes isolated from healthy dairy cows were treated with 3-MA and different concentrations of PA and cells and supernatants were collected. The expressions of LC3B, Beclin1, mTOR, UKL1, SQSTM1, IL-1β, IL-6 and TNF-α in lymphocytes were detected by qRT-PCR. The cell activity and release of proinflammatory cytokines TNF-α, IL-6 and IL-1β were measured by CCK-8 and ELISA, respectively. The CCK-8 results showed that PA significantly inhibited lymphocyte activity(P<0. 01), and its cell activity was significantly enhanced after 3-MA treatment(P<0. 01); Compared with the control group(PA=0 μg/mL), the expression levels of ULK1 and LC3B mRNA in the PA treatment group(excluding 3-MA)were significantly increased(P<0. 01), mTOR, Beclin1, and SQSTM1 mRNA were significantly decreased(P<0. 01), IL-1β and IL-6 mRNA expression were significantly increased(P<0. 01), while TNF-α was not expressed. After the addition of 3-MA, SQSTM1 and Beclin1 were significantly increased, while LC3B mRNA expression was significantly decreased(P<0. 01); IL-1β and IL-6 mRNA expression were significantly down-regulated(P<0. 01); PA increased the release of proinflammatory cytokines IL-6 and IL-1β(P<0. 01), significantly inhibited the release of TNF-α(P<0. 01), while it was significantly decreased in 3-MA+PA mixed treatment(P<0. 01). In conclusion, PA can regulate the activation of lymphocyte inflammatory signaling pathway in cows through autophagy.Keywords：cow;palmitic acid;lymphocyte;autophagy;inflammation4|11|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To identify and analyze the differential expression of lncRNA in different muscle development period of Sunite sheep, the lncRNA in muscle tissues of 120 d and 5-month-old lambs of Sunite sheep were compared and analyzed by RNA-Seq technology. The differentially expressed lncRNA and their target genes were screened out. And the prediction of mRNA was analyzed by GO and KEGG and the differentially expressed lncRNA were verified by qRT-PCR. The results showed that: A total of 626 lncRNA were differentially expressed between 120 d and 5-month-old muscles, and 1 273 mRNA coding genes were targeted; GO and KEGG analysis showed that these differentially expressed genes were mainly involved in the regulation of metabolic processes, biosynthesis, gene expression, protein binding, and the regulation of mTOR signaling pathway, FoxO signaling pathway, insulin signaling, actin cytoskeleton, Wnt signaling pathway, gap junction and other signaling pathways; The results of qRT-PCR showed that the expression levels of 8 randomly selected lncRNA in muscle tissue were consistent with the results of RNA-Seq. In conclusion, RNA-Seq technology was used to analyze the differentially expressed lncRNA and its target genes in Sunite sheep 120 d fetus and 5-month-old lamb, and found that they were involved in the muscle development and growth process of Sunite sheep at different growth stages. This study provided a theoretical basis for better understanding of the genetic regulation mechanism of muscle growth and development in Sunite sheep from the perspective of lncRNA, as well as a reference for sheep molecular assisted breeding.2|14|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to study the effect of melatonin on the growth of skin epithelial cells of Inner Mongolia cashmere goats, five test groups were set at 0, 100, 300, 600 and 900 pg/mL of melatonin. CCK-8 method was used to detect the proliferation of skin epithelial cells. Quantitative PCR was to detect the expression of Wnt10b and β-catenin gene, and ELISA was used to detect the expression of Wnt10b and β-catenin protein. The results showed that 300 pg/mL melatonin had the best effect on the proliferation of skin epithelial cells(P<0. 05), and the mRNA and protein expressions of Wnt10b and β-catenin were significantly higher than those in other groups(P<0. 01). In summary, 300 pg/mL melatonin can significantly promote the proliferation of skin epithelial cells and increase the expressions of Wnt10b and β-catenin.Keywords：Inner Mongolian cashmere goats;melatonin;skin epithelial cells;cell proliferation;Wnt;10;b;β-catenin1|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the effect of exogenous neurokinin B(NKB)on the expression of gonadotropin releasing hormone(GnRH)in the hypothalamus and Kisspeptin in hypothalamic-pituitary-ovarian axis(HPOA)in female rats, forty Sprague-Dawley rats at the age of 60 d were divided into experimental group and control group randomly. Rats in the experimental group were injected with NKB solution into the lateral ventricle, and those in the control group were treated with equal volume of saline. All rats were sacrificed 20 min after the lateral ventricle treatment. Immunofluorescence method was used to analyze the expression of GnRH and Kisspeptin protein in each tissue. The expression levels of GnRH mRNA and Kiss1 mRNA in hypothalamus were analyzed by RT-qPCR. The results showed that: The expression of GnRH mRNA in the hypothalamus was significantly increased(P <0. 05)and Kiss1 mRNA was significantly decreased(P<0. 05)in experimental group compared with the control group; The number of GnRH-positive cells was significantly increased in preoptic area(POA)(P<0. 05)of the hypothalamus, and was increased in arcuate nucleus(ARC)and median eminence(ME)(P>0. 05), but a significantly decrease(P<0. 05)was found in the number of Kisspeptin-positive cells in ARC, POA, paraventricular nucleus(PVN)and anterior ventral paraventricular nucleus(AVPV)of the hypothalamus; NKB inhibited the expression of Kisspeptin in the anterior pituitary(P<0. 05), but did not affect the expression of Kisspeptin in the ovary. In summary, NKB regulates the reproduction of female rats by regulating the expression of Kisspeptin and GnRH on HPOA.Keywords：rat;neurokinin B;Kisspeptin;gonadotropin releasing hormone;hypothalamic-pituitary-ovarian axis1|9|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at the problem of uneven airflow distribution and tipburn appear frequently in the traditional ventilation mode, under the condition of satisfying the appropriate tube aperture ratio, CFD(Computational fluid dynamics)simulation software was adopted to simulate the airflow distribution of crop canopy under different cases designed. The effect of hole diameter, hole number and inlet air velocity on crop canopy air velocity distribution were explored and the optimal tube ventilation case was determined finally. The results showed that the airflow uniformity of all ventilation cases was better than that of traditional ventilation mode. By comparing and analyzing the proportion of the average air velocity on the surface of the crop canopy and the suitable area(the wind speed range was 0. 3-1. 0 m/s), it was found that the 25-holetube ventilation case with the inlet air velocity of 3 m/s was the best. The average air velocity on the surface of the crop canopy was 0. 55 m/s, and the suitable area accounted for 86. 1% of the total canopy surface area.Keywords：plant factory;tube ventilation;canopy;airflow uniformity;computational fluid dynamics3|13|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Using the research methods of plant nutrition and horticultural cultivation, the physical and chemical properties of the biogas residue from the distiller grains of Maotai flavor liquor and its application as tomato seedling substrate were investigated. The results showed that: 1)The pure biogas residue was not suitable for direct use as seedling substrate and needs to be fermented and compounded. After fermentation, the particle size of biogas residue matrix was more uniform and its water absorption capacity was enhanced, but its EC value was significantly increased, which reduced the germination index and seedling rate when compared with that of the unfermented matrix. Through the combination of pit mud and vermiculite, the physical and chemical properties of the matrix were within a reasonable range. 2)Through the experiment of tomato seedling cultivation with different matrix formula, the best formula selected was fine slag∶vermiculite∶pit mud quality ratio of 15∶8∶2, which had the effect of promoting tomato growth, increasing biomass and cultivating strong seedlings. The plant height, stem diameter and leaf area of the formula were increased by 108. 33 mm, 1. 28 mm and 35. 08 cm2, respectively. The biomass(dry weight)of the aboveground and underground parts was significantly higher than that of the control and other treatments. Its seedling index reached 0. 49, which was significantly higher than that of the peat control. In conclusion, the biogas residue of distiller grains wis a good substrate material for seedling, which can be used for tomato seedling after fermentation and compounding.Keywords：biogas residue of distiller grains;tomato seedling substrate;fermentation;compounding1|11|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at the problem of noise pollution from the vibration signal of the chaff cutter, the vibration signals of chaff cutter was analyzed by using EMD(Empirical mode decomposition)and adaptive threshold algorithm based on SURE(Stein' sunbiased risk estimate). The nature of the auto correlation function and the second-order derivative threshold function were also adopted. The results showed that: 1)The analog signal was denoised by the EMD adaptive threshold, the SNR(Signal to-noise ratio)was increased by 15-19 dB; After denoising through the wavelet threshold, The SNR was increased by 9-13 dB; After denoising BY the EMD, the SNR was increased 5-11 dB; After denoising with the EMD threshold, the SNR was increased by 12-15 dB. 2)After denoising the vibration signal of the chaff cutters by the EMD adaptive threshold algorithm, the high-frequency signal >200 Hz was eliminated, and the amplitude of the low-frequency signal ≤200 Hz was retained; After the denoising by the wavelet threshold, the vibration signal with >200 Hz was not eliminated; After denoising with EMD low-pass and EMD threshold, the amplitude of the low-frequency signal of vibration signal ≤200 Hz was reduced, resulting in partial signal distortion. In summary, the EMD adaptive threshold algorithm proposed in this study is not only versatile, but also can achieve noise reduction function on the vibration signal of the hay machine.Keywords：chaff cutters;vibration signal;signal denoising;EMD;adaptive threshold1|10|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the synergistic relationship between urban land carrying capacity and urbanization level, this study takes Inner Mongolia Autonomous region as study case and uses TOPSIS model to measure urban land carrying capacity and urbanization level. The results show that: 1)The average urban land carrying capacity of Inner Mongolia is 0. 268 in 2018. Hohhot, Baotou and Wuhai are high land carrying capacity cities, other cities are on low. The urbanization level increased from 0. 377 in 2001 to 0. 606 in 2018. The average annual increases of population urbanization and land urbanization are 3. 15% and 7. 57% respectively. 2)The correlation between urban land carrying capacity and urbanization level enhanced year by year, and the Bivariate Morian's index increased from 0. 061 in 2001 to 0. 327 in 2018. 3)The synergy of decoupling model measure shows a continuous synergetic upward trend, the synergy state rose from the initial “Synergy Down Level 1” to “Synergy Up Level 3”. Although during the 13th Five-Year Plan period, the coordination state of “Hohhot-Baotou-Ordos Region” was adjusted with no reduction in the quality of urban development. On the contrary, the trade-off between urban land carrying capacity and urbanization level would lead to the overall improvement of urban development quality in Inner Mongolia.Keywords：synergetic change;urban land carrying capacity;urbanization level;decoupling model;Inner Mongolia2|9|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To analyze the evolution of land use pattern in mountainous and hilly areas, from the perspective of earth system science, an improved CLUE-S model is adopted to simulate the evolution of land use patterns during 2010-2017 and 2017-2024 by taking Jincheng, Shanxi Province, China as a study case. The results show that: 1)At the test stage, the improved CLUE-S model of Auto-Logistic regression can better simulate the change of land use types in Jincheng. The AUC values were greater than 0. 8 in general. The simulation results compared with the actual land use pattern in 2017, the global Kappa value was 0. 71, which can be used for the forecast demand; 2)At the simulation stage, comprehensive consideration of natural, social, and economic factors, comparing the planning with the ecological protection scenario, the land use patterns were found to be spatially competitive. Under “planning scenario”, the development of cities, agriculture, and ecology was balanced; In “ecological protection scenario”, social and economic development was relatively slow, but the proportion of ecological land was higher; 3)In general, the analysis of land use cover change under two different scenarios in 14 years, the mountainous area in the east and west were converted from grass land to forest, the hilly and plains in the central part of the area converted from farmland to forest.Keywords：land use;improved CLUE-S model;earth system theory;pattern evolution simulation;mountainous and hilly areas3|9|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：By taking the Huaihai Economic Zone as research object, the remote sensing, socio-economic and other multi-source data in this region were collected, and land use thematic mappings of 2006, 2011 and 2017 were conducted. A CA-Markov model was used to simulate the land use situation in the study area in 2025. In the meantime, the carbon storage in the research area was estimated and predicted according to the carbon density. The results showed that: 1)The proportion of cultivated land for relatively large during the study period, but its trend of non-agricultural was obvious. The construction land continued to expand, meanwhile other land areas continued to decrease. The area of other land types showed an overall increasing trend; 2)Simulation the land use by the CA-Markov model in the Huaihai Economic Zone in 2025achieved good results. Except for the other land type, the prediction errors for each land type area were less than 5%; 3)The carbon stocks in 2006, 2011, and 2017 were 1 720. 018, 1 720. 020 and 1 716. 531 Tg, respectively. The carbon storage in 2025 is expected to reach 1 720. 726 Tg, which is increase by 4. 195 Tg compared with that in 2017. The change of carbon storage generally presented agglomeration characteristics. The reduced area was continuously distributed but the area decrease was small and the increased area was sporadic but large. In conclusion, on the basis of effective protection of cultivated land, the conversion of cropland to forest and forest land resources protection should be proceeded in an orderly manner, which not only ensures food security but also improves the ecological environment quality of the study area.Keywords：Huaihai Economic Zone;land use;CA-Markov;carbon density;carbon storage3|11|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to deeply understand the application of blended feedstock briquetting method in the studies of agricultural and forestry wastes briquetting, and analyze its development trend in the future, the research status of agricultural and forestry waste resource utilization under the condition of blending and briquetting are categorized and summarized by literature research. The results show that: 1)When agricultural and forestry wastes are reused in producing fuel, forage, biocomposite, the blended feedstock briquetting method can help to improve the combustion quality, feeding effects, material performance and processing cost of biomass products. 2)The key to blended feedstock briquetting is to combine the physical and chemical characteristics of various agricultural and forestry wastes so as to optimize the briquetting capacity and to improve the usability of biomass products at reduced cost. Finally, development countermeasures are put forward accordingly, and using muti-scale analysis to study the briquetting mechanism of blended feedstock is suggested as a research emphasis in the future.Keywords：agricultural and forestry wastes;resource utilization;blended feedstock;briquetting;research status3|12|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on CNKI, ScienceDirect and Web of Science databases, around 200 literature related to N runoff and leaching loss of major cereal systems of three major plains in China and published on 1995-2016 were collected by taking “non-point pollution” as searching theme and “N”, “leaching”, “runoff”, “chemical fertilizer”, “slow and controlled-release fertilizer” and “straw returning practice” as keywords. Yield-scaled N loss was calculated by extracting valuable data from the literature, including fertilization amount, soil nutrition, soil texture, precipitation, irrigation and crop yield. Impact factors were analyzed by setting up multi-factors linear regression models of yield-scaled N loss for different crops and specific field management based on step-wise regression method. The main results were: 1)In terms of chemical fertilizer, the main impact factor affecting yield-scaled N leaching loss was soil total nitrogen content(TN)in MLYP(Middle-Lower Yangtze Plain), and N fertilization amount and TN in NCP(North China Plain); 2)Yield-scaled N runoff loss was more affected by irrigation field management, P fertilization amount and TN in MLYP; 3)In terms of SCRF(Slow and controlled-release fertilizer)and straw returning tillage, the main impact factors were TN and N fertilization amount, respectively. Relevant management measures suggested in this study are as follows: In MLYP, yield-scaled N runoff loss is higher than yield-scaled N leaching loss. In order to reduce yield-scaled N runoff loss and enhance the recycling and retaining of N nutrient, it is necessary to adopt technologies such as ecological ditches or buffer zones. The application area of SCRF should be increased. In NCP, in the case of chemical fertilizer, N application is an important factor positively affecting yield-scaled N leaching loss, which suggests a proper value could be determined by decreasing N application amount. It is needed to decrease wheat growing area in sandy soil and increase straw returning tillage area. In Northeast Plain, both irrigation and N fertilization management should be optimized to improve nitrogen use efficiency.Keywords：yield-scaled nitrogen pollution loss;runoff;leaching;impact factor0|12|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the influence of different kinds of cooling measures and corollary equipment on the construction and economy operation of pig farms, this research adopted the energy balance model based on VBA and selected one mechanically ventilated fattening pig house(1 000 pigs inside)located in Haikou area as the research object. Using the thermal property of the envelope structure, the cooling effect, indoor environment suitability, energy consumption level and cost under three different cooling modes of fan system, the cooling pad system and air conditioning system were studied based on the annual temperature and humidity in Haikou area. The results showed that: The fan system could not meet the requirement of the appropriate internal temperature when the external ambient temperature of the pig house was greater than 27 ℃. When the dry bulb temperature is greater than or equal to 30 ℃, the cooling pad system can not meet the appropriate temperature demand for the pig house, while the air conditioning system can keep the temperature inside the pig house at or below 27 ℃. The air conditioning system has the best performance on the indoor environment, while the cooling pad system has the worst effect. Additionally, the energy consumption of the three cooling measures varies greatly in high-temperature environment. The fan system has the lowest energy consumption, while the air conditioning system has the highest energy consumption. In conclusion, the cooling pad system can be the most suitable way to cool down the fattening pig house in Haikou area.Keywords：Haikou area;pig house;environmental parameters;cooling method;economic analysis3|10|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the impact of factors such as institutional distance on the export efficiency of Chinese agricultural products in Asian countries along the “Belt and Road”, based on stochastic frontier gravity model, this study empirically analyzes the trade efficiency of China's agricultural products export to Asia countries along the “Belt and Road” from 2004 to 2017, and explains the changing trend of export efficiency to different countries. Institutional distance is introduced into the trade inefficiency item. The impact of the item to the export efficiency of agricultural products to the Asian countries along the “Belt and Road” is also studied. The results show that China's export efficiency of agricultural products to the Asia countries along the “ Belt and Road” is at low level and diverges among different countries displaying a negative time-varying effect; Institutional distance has a significant negative impact on the level of trade efficiency. In addition, tariffs and exchange rates also hinder the improvement of export efficiency. After signing free trade agreement with China, being WTO members and APEC members have promoted the improvement of trade efficiency in these member countries. At the end of this study, corresponding suggestions, e. g. strengthening policy communication, accelerating the negotiation of free trade zones to improve the export efficiency of agricultural products are put forward.Keywords：the “Belt and Road”;agricultural products;export efficiency;institutional distance;stochastic frontier gravity model3|8|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the balanced panel data in 19 provinces from 1979 to 2018, this study uses Hicks-Moorsteen productivity index to measure the growth of total factor productivity(TFP)of maize. A spatial dobbin model is used to test its spatial convergence. The results show that: 1)The average annual growth rate of maize TFP from 1979 to 2018 is 2. 20%, and the cutting-edge technological progress is the main driving force. 2)There are significant spatial differences in TFP growth and its dynamic mechanism in China. Maize productions in most provinces show the “single drive” type growth characteristic, which is coexisted with the deterioration between technological progress and technical efficiency. 3)There is a significant spatial convergence trend of inter-provincial maize TFP growth in China. Because of the existence of spatial spillover effect, the growth rate of maize TFP is slowed down and the convergence period is prolonged.Keywords：total factor productivity;maize;Hicks-Moorsteen index;spatial convergence1|8|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the data from 11 counties(cities/districts)in 4 cities(states)of Hubei Province, the binary Logistic model is used to discuss the influence of labor force and agricultural technical services on farmers' straw returning behavior. The research show that: Firstly, the shortage of labor resources limits the farmers' adoption of straw returning technology, while agricultural technical services significantly promoted it. Secondly, the agricultural technical services alleviate the restrictive effect of labor shortage on farmers' straw returning behavior. Thirdly, as two different service modes of agricultural technical service, the agricultural machinery service directly positively affect farmers' straw returning behavior at the present stage, while the technical training indirectly affect farmers' straw returning behavior by alleviating the restriction of insufficient labor resources on farmers' adoption of straw returning technology. Therefore, it is necessary to strengthen technical training, improve the quality and efficiency of straw returning technology, strengthen land transfer and perfect straw supervision system to promote farmers' adoption on straw resource utilization technology.Keywords：labor transfer;agricultural technical services;straw returning2|9|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to balance the contradiction between agricultural carbon reduction and economic growth in the Yangtze River Economic Belt, based on the clarifications of the current characteristics of agricultural carbon emissions and agricultural added value from 1993 to 2017, this study uses coupling coordination model and Tapio decoupling model to explore their relationships and evolution characteristics. The results show that: 1)From 1993 to 2017, the agricultural carbon emissions in the Yangtze River Economic Belt showed a fluctuating upward trend, while the agricultural added value increased steadily. The spatial distribution characteristics between the two are similar, but their regional differences are large. 2)There is a coupling coordination development relationship between the agricultural carbon emission system and the agricultural economic system, and the coupling coordination degree is gradually increasing. It basically realizes the transformation from overall imbalance to overall coordination, but there are obvious differences among the upper, middle and lower reaches. 3)Both weak decoupling and strong decoupling are the main features between the agricultural economic system and the agricultural carbon emission system, indicating that in most cases the growth rate of agricultural carbon emission is lower than that of the agricultural economy. In conclusion, the provinces in the Yangtze River Economic Belt have made certain achievements in agricultural carbon emission reduction in recent years.Keywords：carbon emissions from agriculture;economic growth;temporal and spatial evolution;Yangtze River Economic Belt5|9|23<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
