云贵高原区吸附态氮、磷负荷模拟及其与土地利用的关系研究

摘要

Based on the principle of Universal Soil Loss Equation (USLE) ,a model was developed for estimating the annual mean soil erosion amount from 1989 to 2008 in Yunnan and Guizhou .USLE was used as the basic theoretical basis and GIS was used as the technology platform for the establishment of erosion models and the estimate result was verified .The validated absorbed nitrogen and phosphorus estimating model was used to simulate the annual mean ab‐sorbed nitrogen and phosphorus loads .Then a methodology was developed to assess the relationships between the ab‐sorbed nitrogen and phosphorus loads and land use structure .The results indicated that :the adsorbed nitrogen and phosphorus loads were related to the loss of soil erosion .And change of land use also played a decisive role in the change of adsorbed nitrogen and phosphorus .%以云贵高原为研究区，采用美国土壤流失方程（USLE）为基本理论，将GIS等空间信息技术作为研究的技术平台，建立了吸附态氮磷模拟模型，利用土壤属性数据库获得氮、磷营养物含量，对云贵地区进行了20年（1989～2008年）平均土壤侵蚀量以及多年平均吸附态氮、磷负荷的模拟和验证，研究分析了区域吸附态氮磷负荷变化与土地利用结构的关系，结果表明：吸附态氮磷负荷与土壤侵蚀状况十分相关，土地利用的变化也对吸附态氮磷变化起着决定作用。