论文部分内容阅读
在防止土壤侵蚀的生产实践中,以小流域为一自然单元,开展综合治理,已逐渐证实是一条正确的途径。因此,首先需要探求较能切实地反映小流域土壤侵蚀状况的指标。我们认为小流域的平均年土壤侵蚀量是反映流域内土壤侵蚀状况的一个主要指标,也是水土流失地区流域规划、综合治理效益、水库设计、打坝淤地等的重要依据。这个指标能较准确地反映小流域内地形、地貌、土壤、植被和人类经营活动等对土壤侵蚀作用的综合影响。随着某些影响因子的变化,土壤侵蚀量也将随着变化。在土壤侵蚀规律的研究中,用数学模型予报小流域土壤侵蚀量是本文所要探讨的问题。
In the practice of preventing soil erosion, it has gradually proved to be a correct approach to take a small watershed as a natural unit and conduct comprehensive management. Therefore, we must first explore the indicators that can more effectively reflect the soil erosion in small watershed. In our opinion, the average annual amount of soil erosion in small watersheds is one of the main indicators reflecting the status of soil erosion in the watershed. It is also an important basis for river basin planning, comprehensive harnessing benefits, reservoir design and damming and siltation in water and soil loss areas. This indicator can more accurately reflect the combined effects of topography, topography, soil, vegetation and human activities on soil erosion in small watersheds. As some of the impact factors change, the amount of soil erosion will also change. In the research of law of soil erosion, using mathematical model to report the amount of soil erosion in small watershed is the issue to be discussed in this paper.