论文部分内容阅读
土壤保持服务是重要的生态系统服务之一,代表生态系统对土壤侵蚀所起到的削减和改善作用。以万州为研究区,基于GIS平台和修正通用土壤流失方程(RUSLE),运用降雨、DEM等数据建模,探讨万州区土壤保持服务功能的空间分布特征并分析其影响因素。结果显示:(1)万州区土壤保持总量为1 435.84×10~5t/a,单位面积年均土壤保持量为417.91 t/(hm~2·a),具有较高的土壤保持服务功能重要性;(2)土壤保持服务空间分布受地形和人类活动等的显著影响,东南部山地区域较高,而铁峰山与方斗山之间的长江河谷较低,其空间分布特征与土壤侵蚀的分布状况大致相反;(3)坡度角度,15°~25°坡度区产沙量最大占全区的41.56%,8°~15°区域次之,这两个坡度区人地矛盾最为集中;土地利用类型中,旱地侵蚀最为强烈,而林地侵蚀微弱并表现出很高的土壤保持服务功能。研究结果对万州乃至整个三峡库区的水土保持工作有借鉴意义。
Soil conservation services are one of the most important ecosystem services that represent the reduction and improvement of soil erosion by ecosystems. Taking Wanzhou as a research area, based on the GIS platform and the modified generalized soil loss equation (RUSLE), the spatial distribution characteristics of soil conservation service functions in Wanzhou District were explored using data modeling such as rainfall and DEM, and their influencing factors were analyzed. The results showed that: (1) The total amount of soil conservation in Wanzhou was 1 435.84 × 10 ~ 5t / a, and the average annual soil conservation per unit area was 417.91 t / (hm ~ 2 · a) (2) Spatial distribution of soil conservation services is significantly affected by the topography and human activities. The southeastern mountainous area is high, while the Yangtze River valley between Tieshan Mountain and Fangdo Mountain is low. The spatial distribution and distribution of soil erosion (3) From the angle of slope, the largest amount of sediment yield in slope area between 15 ° and 25 ° accounted for 41.56% of the total area, followed by the area between 8 ° and 15 °, and the contradiction between man and land was most concentrated in these slope areas. The land use Of the types, dryland erosion is the most intense, while forestland erosion is weak and shows high soil conservation service functions. The results of this study can be used for reference to water and soil conservation in Wanzhou and the Three Gorges reservoir area.