检索结果-南通市图书馆

Conservation genomics of the critically endangered Chinese pangolin

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2024年第10期67卷 2051-2061页

作者： Shichao Wei Huizhong Fan Wenliang Zhou Guangping huang yan hua Shibao Wu Xiao Wei Yiting Chen Xinyue Tan Fuwen Wei Jiangxi Province Key Laboratory of Conservation Biology College of ForestryJiangxi Agricultural UniversityNanchang 330045China Center for Evolution and Conservation Biology Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China Institute of Zoology Chinese Academy of SciencesBeijing 100101China Guangdong Provincial Key Laboratory of Silviculture Protection and UtilizationGuangdong Academy of ForestryGuangzhou 510520China School of Life Science South China Normal UniversityGuangzhou 510631China Terrestrial Wildlife Rescue and Epidemic Diseases Surveillance Center of Guangxi Nanning 530003China

The Chinese pangolin(Manis pentadactyla,MP)has been extensively exploited and is now on the brink of extinction,but its population structure,evolutionary history,and adaptive potential are ***,we analyzed 94 genomes from three subspecies of the Chinese pangolin and identified three distinct genetic clusters(MPA,MPB,and MPC),with MPB further divided into MPB1 and MPB2 *** divergence of these populations was driven by past climate *** MPB2 and MPC,recent human activities have caused dramatic population decline and small population size as well as increased inbreeding,but not decrease in genomic variation and increase in genetic load probably due to strong gene flow;therefore,it is crucial to strengthen in situ habitat management for these two *** contrast,although human activities have a milder impact on MPA,it is at high risk of extinction due to long-term contraction and isolation,and genetic rescue is urgently ***1 exhibited a relatively healthy population status and can potentially serve as a source ***,our findings provide novel insights into the conservation of the Chinese pangolin and biogeography of the mammals of eastern Asia.

关键词： Manis pentadactyla conservation genomics demographic history human activities conservation strategies

Relationship of the Interests between the Dairy Farmer and the Company in Ecological Agriculture——A Case of the Dairy Industry in Sichuan Province,china

在线全文

学校读者我要写书评

暂无评论

Asian agricultural Research 2010年第8期2卷 8-11,16页

作者： CHEN Jia-wei,QI yan-bin college of economics and management,Sichuan agricultural university,Yaan 625014,china

Development status of dairy industry in Sichuan Province,china is analyzed,indicating that how to ensure the high-quality and ecological production of peasant households has become an important issue for the safety and healthy of the masses and the development of dairy *** model is established and the solution for the model is *** on analyzing the relationship of the interests between the dairy farmer and the company in ecological agriculture,two mixed strategies of Nash equilibrium are *** is that when the probability is equal to α*1,there are no differences between purchasing or not purchasing;if the probability of company purchase is equal to β*1,there are no differences between producing high-quality milk and poor-quality *** other is that if the probability of dairy farmer under normal transaction is equal to α*2,there are no differences for the company to select high-quality inspection or low-quality inspection;if the probability of high-quality inspection is equal to β*2,passing off inferior milk as high-grade one has no differences with normal ***,moral risk of the dairy farmer should be prevented by probability β*1 and high-quality ***,countermeasures are put forward,such as reducing the risk of transaction,ensuring the basic interest of the dairy farmer engaged in ecological production,intensifying the supervision,correctly preventing the moral risk of dairy farmer,improving the laws and regulations,and coordinating interests between dairy farmer and company in industrial chain.

关键词： Game theory Equilibrium High quality milking Moral

The Construction of Orange Drought Warning Model——A Case Study of Beibei Orangery in Chongqing City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian agricultural Research 2011年第3期3卷 137-140,145页

作者： ZHOU Shuang-yan,ZHENG Xun-gang college of economics and management,Sichuan agricultural university,Ya’an 625014,china college of economics and management Sichuan Agricultural University

On the basis of expounding the status quo of china's orange drought warning model research,according to the real-time monitoring data of Beibei Orangery in Chongqing City from June to August in 2010,by using factor analysis and principal component regression,we construct the drought warning model of Beibei Orangery in Chongqing City,and we conduct test and correction on drought warning model by using MAPE principle of assessment and prediction accuracy and the real-time monitoring data of *** results show that as for the prediction of orange drought,the model has strong *** we conduct continuous dynamic monitoring on the relevant indices regarding orange drought by virtue of this model,and pay attention to the analysis of variation trend of prediction value,then it will be more practical;the warning effect,to some extent,further indicates that using factor analysis and principal component analysis method to conduct drought warning is rational;as the prediction model is static and linear,so we should perfect model to promote the accuracy and practicality of model.

关键词： Orange Drought warning Chongqing City Principal co

Contrastive Research on Domestic and Foreign Ecological Agriculture Policies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian agricultural Research 2010年第10期2卷 1-4,8页

作者： CHEN Jia-wei,QI yan-bin,ZHAO Yu-feng college of economics and management,Sichuan agricultural university,Ya’an 625014,china

In the first place,the definitions of ecological agriculture defined by scholars both at home and abroad are *** the second place,the domestic and foreign ecological agriculture policies are *** contrastive research on the domestic and foreign ecological agriculture polices,the problems in the development of ecological agriculture in china are *** mirroring the western experiences in developing ecological agriculture,the countermeasures and relevant suggestions are put forward from the perspective of *** first one is to increase the subsidies from the government to ecological *** second one is to clarify the standard of ecological agriculture *** third one is to promote the industrialization of ecological *** fourth one is to strengthen the construction of ecological demonstration region and ecological village.

关键词： Ecological agriculture Policies agricultural subsi

Prediction and Analysis of Chinese Rural Households' Consumption Level Based on the ARIMA Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian agricultural Research 2011年第3期3卷 83-85,88页

作者： yan Jian-biao,LI Qiang college of economics & management,Beijing Forestry university,Beijing 100083,china college of economics ＆ management Beijing Forestry University

By using the software SAS9.2 and the relevant data of consumption level of rural residents in china from 1952 to 2008,the ARIMA model is *** model is used to analyze and forecast the time series of the consumption level of Chinese rural *** results show that in the near future,the consumption level of Chinese rural residents will be further *** 2012,the level will break through per capita 5 000 yuan,almost 100 times more than that in the primary time *** consumption level does not equal to living *** let farmers lead a good life,the government should follow the objective laws;take the overall situation into consideration;coordinate the relations among farmers' consumption level,national subsidies and farmers' production ***,The paper suggests that the historical and objective factors should be attached more importance ***,raising farmers' income and allaying farmers' fear were effective measures in developing the consumptive potential of rural market and promoting the economic sustainable development.

关键词： ARIMA Model Rural households consumption Economic

Estimation and Dynamic Judgment of Urban-rural Coordinated Development:A Case Study of Chongqing City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian agricultural Research 2012年第7期4卷 21-27页

作者： huaNG Qing-hua ,WANG Zhao,JIANG Song,LIU Jian-hui college of economics and management,Southwest university,Chongqing 400715,china

Using AHP(Analytic Hierarchy Process)and GCA(Grey Comprehensive Analysis),this article measures the degree of urban-rural coordinated development of Chongqing City,and establishes GARCH model to analyze its dynamic *** results show that urban-rural coordination degree of Chongqing City tended to decline year by year in the period 1985-2010 on the whole;after it became a municipality directly under the Central Government,the average annual rate of decline reached 1.78%.Further,from GARCH modeling analysis,there is no"clustering"in urban-rural coordination degree of Chongqing City,and the impact of fluctuation state in the past on the future will gradually *** is no "leverage effect"in urban-rural coordination degree of Chongqing City,and if the government does not exert"external force",urban-rural coordination degree will decline year by *** in the long run,urban-rural coordination degree will gradually converge to the equilibrium *** on this,we propose to strengthen institutional innovation and help propel coordinated urban and rural development,in terms of employment,social security,finance,land management and use.

关键词： Urban-rural coordination degree AHP GCA GARCH Indi

乡村产业融合如何影响农村人居环境治理绩效?——基于集体行动视角的考察

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

农业现代化研究 2024年第3期45卷 455-465页

作者：颜华董富强东北农业大学经济管理学院黑龙江哈尔滨150030 东北农业大学现代农业发展研究中心黑龙江哈尔滨150030

激活内生发展动力是实现农村人居环境有效治理的重要途径。本研究基于集体行动理论,以江苏省为例,利用2022年中国土地经济调查数据,运用OLS模型和中介效应模型,系统性考察乡村产业融合对农村人居环境治理绩效的影响,探讨村庄集体行动在... 详细信息

激活内生发展动力是实现农村人居环境有效治理的重要途径。本研究基于集体行动理论,以江苏省为例,利用2022年中国土地经济调查数据,运用OLS模型和中介效应模型,系统性考察乡村产业融合对农村人居环境治理绩效的影响,探讨村庄集体行动在乡村产业融合与农村人居环境治理绩效间的中介效应。结果表明,乡村产业融合对农村人居环境治理绩效具有显著的正向影响,并经过模型内生性处理和稳健性检验后依然成立。机制分析揭示,村庄集体行动,即组织领导力和农民参与度,在乡村产业融合与农村人居环境治理绩效之间发挥着重要的中介效应。进一步的异质性分析表明,内部融合型、多功能拓展型和技术渗透型的融合模式能显著提升农村人居环境治理绩效,而产业链纵向延伸型则影响不显著;在集体经济发展水平较低的村庄,产业融合的积极效应更为显著。据此,政府应通过完善产业融合扶持政策、探索产业融合促进集体行动达成的转化机制、防范由产业链纵向延伸型融合模式引致的生态环境风险和加快发展壮大农村集体经济,提升农村人居环境治理绩效。

关键词：产业融合集体行动组织领导力农民参与度农村人居环境治理绩效

在线全文

学校读者我要写书评

暂无评论

环保猪肉的消费者行为分析

四川农业大学学报 2009年第3期27卷 371-376页

作者：任大廷漆雁斌四川农业大学经济管理学院四川雅安625014

消费者对环保猪肉的消费能否实现买前判定、买时决定、买后安定、吃得镇定、食后肯定,不仅决定环保猪肉的市场前景,而且也直接影响到现代生猪产业的发展。本研究采用拦截样本取样法,并深入剖析了138位被调查者对环保猪肉的消费行为。结... 详细信息

消费者对环保猪肉的消费能否实现买前判定、买时决定、买后安定、吃得镇定、食后肯定,不仅决定环保猪肉的市场前景,而且也直接影响到现代生猪产业的发展。本研究采用拦截样本取样法,并深入剖析了138位被调查者对环保猪肉的消费行为。结果表明:大多数消费者对环保猪肉的认知程度较低,对其安全性还心存疑虑;大多数消费者对环保猪肉有较强的购买愿望,说明消费者对猪肉消费安全非常重视,并愿意为环保猪肉支付更高的价格。研究还表明,信息满意度、消费者收入水平、文化程度、年龄、性别是影响环保猪肉消费者支付意愿的主要因素。最后提出:只有生猪产业链上各个利益主体共同努力,营造一个安全、健康、科学的环保猪肉消费环境,才能促进现代生猪产业的健康发展。

关键词：环保猪肉消费行为支付意愿

Path Selection for Increasing Peasants’ Income through the Practice of Narrowing "The Three Gaps" in Chongqing

在线全文

学校读者我要写书评

暂无评论

Path Selection for Increasing Peasants’ Income through the ...