摘要
依据地形地貌特征、人类活动等特点,总结并分析了北京市水土流失综合综合治理的"三道防线"治理模式,即从宏观尺度上把北京市从远山深山到平原依次划分为生态修复区,生态治理区和生态保护区3个治理一级区,并详细阐述了该模式的结构和功能。同时对该区域水土流失在时空尺度上的响应进行了研究。分析结果表明,北京市各区县土壤流失强度的空间分布及年际之间的变化规律与各区县年降雨侵蚀力的空间分布及年际之间变化情况基本一致,土壤流失时空强度随降雨侵蚀力时空变化而变化的程度存在较大差异,其中房山区、门头沟区、昌平区和怀柔区的年土壤流失强度的年际变化较小,密云县、平谷县和延庆县的年土壤流失强度的年际之间变化较大。并对其原因进行了分析。
In this paper, the ＂three defense lines＂ system City is analyzed according to the topographical conditions of integrated soil and water loss control in Beijing and human activities. At the same time, the envi- ronmental effects of the ＂three defense lines＂ are studied. The analysis of soil loss indicates that the spatio- temporal distribution of soil loss is basically consistent with the change of rainfall erosivity. However, there is a greater difference in the magnitude of the spatiotemporal distribution as changed with the spatiotemporal distribution of rainfall erosivity. The change of annual soil loss in Fangshan, Mentougou, Changpingqu, and Huairouqu districts is less, and the change in Miyun, Pinggu, and Yanqing counties is relatively greater.
出处
《水土保持通报》
CSCD
北大核心
2009年第6期52-56,共5页
Bulletin of Soil and Water Conservation
基金
国家重点基础研究(973)发展计划(2007CB407207)
