土壤侵蚀预报模型中的植被覆盖与管理因子研究进展

植被覆盖和土地管理措施是土支离破碎中侵蚀的主要抑制因素之一，通用土壤流失方程（USLE）中的植被覆盖与田间管理因子（C）是评价这种抑制作用的有效指标，并被广泛采用和深入研究。我国在这方面的研究还不能满足土壤侵蚀预报和水土保持规划的要求，在系统回顾该因子的研究历史的基础上，介绍了USLE和RUSLE中C因子估计方法及其不断改进和完善的过程，并概述了中国的覆盖与田间管理因子的研究进展。此外，总结国内在（C）因子估计值以及植被覆盖度，地面覆盖物和植被根系对土壤侵蚀的影响等方面研究成果，分析了目前我国覆盖与田间管理因子研究中存在的3个方面问题，并提出了前景展望。

Advance in researches on vegetation cover and management factor in the soil erosion prediction model

Vegetation cover and land management are the main limiting factors of soil erosion ,and quantitative evaluation on the effect of different vegetation on soil erosion is essential to land use and soil conservation planning. The vegetation cover and management factor ( C ) in the universal soil loss equation (USLE) is an index to evaluate this effect,which has been studied deeply and used widely. However, the C factor study is insufficient in China. In order to strengthen the research of C factor, this paper reviewed the developing progress of C factor,and compared the methods of estimating C value in different USLE versions. The relative studies in China were also summarized from the aspects of vegetation canopy coverage, soil surface cover, and root density. Three problems in C factor study were pointed out.The autors suggested that cropland C factor research should be furthered,and its methodology should be unified in China to represent reliable C values for soil loss prediction and conservation planning.