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首页> 外文会议>Remote Sensing and Modeling of Ecosystems for Sustainability II >Grade Agricultural Soil Loss Amount by Integrating GIS and USLE in Upstream of Yangtze River, China
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Grade Agricultural Soil Loss Amount by Integrating GIS and USLE in Upstream of Yangtze River, China

机译：基于GIS和USLE的长江上游农业土壤流失量分级研究。

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摘要

Natural Forest Conservation Program (NFCP) was established in China in 1998. As a nationwide engineering project, one of the most important tasks was to mandate conversion of marginal farmlands to forestland or grassland (reforestation or afforestation in farmlands) where topographical slope steepness was more than 25 degree. In order to quantitatively grade agriculture soil loss amount and assess spatio-temporal variation of soil erosion volume, as well as to guide the process of the conversion of farmlands to forest in upstream of Yangtze Rivers. The research analyzed how to calculate K, S, L, C and P factors of Universal Soil Loss Equation (USLE) on the base of considering terrain, climate and characters of agricultural soil using GIS technology. The methods can adapt to the variation terrain of the dry valley region in upstream of Yangtze Rivers. As believed the reforestation was a long-term engineering, the planning of reforest farmlands should be a temporal decision process, which should be considered that where should be afforested at once and where should afforested in abeyance on the basis of grading soil loss amount and the others conditions of farmland. Grading agricultural soil loss amount would be beneficial to program a feasible plan in the conversation of farmlands to forest.
机译：天然林保护计划（NFCP）于1998年在中国成立。作为一项全国性的工程项目，最重要的任务之一是要求将边际耕地转换为地形坡度更大的林地或草地（在农田中进行重新造林或造林）比25度为了定量评价农业水土流失量，评估土壤侵蚀量的时空变化，并指导长江上游农田退耕还林过程。该研究分析了在考虑地形，气候和农业土壤特征的基础上，利用GIS技术计算通用土壤流失方程（USLE）的K，S，L，C和P因子。该方法可以适应长江上游干旱谷地区的变化地形。鉴于重新造林是一项长期工程，重新造林农田的规划应是一个暂时的决策过程，应考虑在对土壤流失量和等级进行分级的基础上，应在哪里立即造林，哪里应该暂时造林。其他农田条件。对农业土壤流失量进行分级将有利于在农田退耕还林中制定可行的计划。

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