Results 21 to 30 of about 702 (97)
An Empirical Analysis on the Measurement of Ecological Efficiency and Its Influencing Factors in the First Demonstration Area of Ecological Civilization in Fujian Province [PDF]
, 2017 运用DEA模型测算出福建省9地市2006-2014年的生态效率,并进一步分解其技术效率指数、技术进步指数、纯技术进步指数和规模效率指数,结果表明：福州、厦门、莆田、宁德生态效率为1.000,达到最优状态;三明、泉州、龙岩3个地市通过短期改善可以达到最优状态;南平、漳州市生态效率为0.889和0.881,低于平均水平,有较大的提升空间。借助Tobit模型对影响福建生态文明先行示范区生态效率的因素进行回归分析得出：人均生产总值、环境管制、技术进步和地区分布对生态效率有显著性影响 ...
唐丹 +4 more
core +1 more source
Effects of Climate Change and Human Activities on Vegetation Coverage in Arsenic Sandstone Area of Yellow River Basin [PDF]
, 2023 [Objective] The arsenic sandstone area is the most serious soil erosion area in the Yellow River basin. Vegetation coverage changes and their driving factors were determined in order to provide a scientific reference for vegetation restoration and ...
An Li +5 more
core +1 more source
Shuitu Baochi Xuebao, 2003 经多次与市县两级水电局和林业局同志及退耕户进行座谈, 并对退耕还林试点工程现场进行 实地考察,了解该县金沙江流域水土流失情况和退耕还林试点工程的实施现状,对退耕还林试点工程实施过程中存在的诸多问题提出了参考建议,供有关部门决策时参考.
李维一 +4 more
doaj +2 more sources
Shuitu Baochi Xuebao, 2023 退耕还林工程是黄土高原控制水土流失的主要措施之一,探讨退耕还林对土壤团聚体稳定性与土壤可蚀性的影响,可为黄土高原地区生态恢复和水土保持效益评价提供科学依据。以农田为对照,选取不同退耕年限(5,10,15,20,25,30年)刺槐林为研究对象,研究退耕还林后0—30 cm土层土壤团聚体稳定性和土壤可蚀性动态变化,并探讨土壤可蚀性与土壤团聚体稳定性之间的关系。结果表明:(1)＞0.25 mm水稳性团聚体含量、平均重量直径、几何平均直径随着退耕年限增加呈递增趋势,三者相比退耕前(农田)分别增加32%~79 ...
范家伟 +3 more
doaj
Analysis of Carbon Stock Evolution and Its Vulnerability Characteristics Based on Land Use Change in Guizhou Province [PDF]
, 2023 [Objective] The spatial and temporal distribution pattern and evolution characteristics of ecosystem carbon storage, its response to land use change, and the vulnerability of ecosystem carbon storage service in each county of Guizhou Province were ...
Chen Darong +5 more
core +1 more source
Spatial Distribution Characteristics of Soil Water and Salt in Newly Cultivated Farmland Under Gully Control in Loess Hilly Region [PDF]
, 2023 [Objective] Part of the newly cultivated farmland formed by the “Gully Control and Land Reclamation” project is facing the risk of soil salinization in the loess hilly region.
Jiao Feng +3 more
core +1 more source
Shuitu Baochi Xuebao, 2001 目前我国西部地区大力开展改善生态环境的退耕还林还草工程。岷江属于长江上游重要的支流之一 ,其水保工作将对整个长江流域的生态环境建设直接产生影响。退耕还林还草的科学问题在于水土保持 ,利用 RS和GIS数据以及通用水土流失模型对岷江上游进行侵蚀强度分级和填图、坡耕地的提取 ,最后统计分析坡耕地和侵蚀强度间的关系 ,确定区域内退耕还林还草的标准 ,并且对退耕还林还草后生态环境的变化和水土流失量进行了初步预测方法。
马超飞 马建文 等
doaj +2 more sources
Shuitu Baochi Xuebao, 2011 采用野外调查和室内分析相结合的方法,对退耕还茶地和退耕还林地土壤水稳性团聚体及其有机碳分布特征进行研究。结果表明:(1)不同土层退耕还茶地土壤各粒径水稳性团聚体占总团聚体的比例均以5mm这2个粒级外,退耕还茶地土壤有机碳含量较退耕还林的低。
何淑勤, 郑子成, 宫渊波
doaj
Spatiotemporal Characteristics and Driver Detection of Landscape Pattern and Ecological Risk in Huangshui River Basin [PDF]
, 2023 [Objective] The characteristics and driving factors of landscape pattern changes and the spatiotemporal evolution of landscape ecological risk was analyzed in order to provide a theoretical basis for integrated watershed management, watershed ecosystem ...
Li Runjie +3 more
core +1 more source
WTO贸易议题与社会政策连结的内在途径——以农业“多功能性”为例的分析 [PDF]
, 2008 在WTO体制中,存在着一些特殊种类的产品,与之生产俱来的社会性非常强烈,自始就不适用WTO关于贸易自由化的一般规则,需将对社会目标的关注"内化"为贸易限制;然而从具体规则的表面,往往看不到其维护社会价值的表达,故很容易被人们所忽略。此乃本文所称的贸易议题与社会政策挂钩的"内在连结"形式。以农业的"多功能性"为典型例子,探讨二者"内在连结"之机理。其所得的原理,还可用以分析其他特殊种类产品的贸易议题以及与贸易有关的议题与社会政策的内在挂钩问题。在WTO农业议题的谈判实践中,运用农业的"多功能性"概念 ...
徐崇利
core