通用土壤流失方程中的坡长因子研究进展

 坡长是决定土壤侵蚀的地形因素。通用土壤流失方程中的坡长因子反映坡长与侵蚀的关系,是土壤侵蚀预报模型的重要指标,在土壤侵蚀预报和水土保持规划中被广泛应用和深入研究。从坡长与侵蚀的关系、坡长因子算法以及坡长因子在地理信息系统环境中的提取3方面,系统回顾坡长因子在国内外的研究成果和发展历史。在此基础上,分析目前在我国土壤侵蚀预报模型的研究和应用过程中,坡长因子存在的5方面的问题,并针对这些问题对未来的研究提出了展望。

Advance in researches on slop length factor in Universal Soil Loss Equation

Slop length is one of topographical factors determining soil erosion intensity. As one of important indexes in the Universal Soil Loss Equation （USLE） , the slop length factor （L） reflects the relationship between slop length and soil loss, which has been used widely and studied deeply in soil loss prediction and soil and water conservation planning. The research progress of L factor at home and abroad was reviewed from the relationship between slop length and soil loss,the estimating methods of L factor, and extraction of L factor in geographic information system. Finally, five main problems of L factor in the study and application of soil loss prediction model in China were summarized, and the research trends were put forward.