降雨条件下土壤侵蚀及其光谱曲线的响应特征

Soil Erosion and the Response Characters of Spectral Curve under the Precipitation Condition

以红砂岩紫色土、紫色页岩紫色土、泥质岩黄棕壤3种土壤为研究对象,通过室内人工模拟降雨方法,研究了降雨条件下丹江口库区典型土壤微地形变化及其光谱曲线的耦合机制并得出两者之间的响应特征。研究结果表明:地表粗糙度和土壤本身的特性有一定的关系,降雨过程中雨滴溅湿和土壤结皮也影响土壤表面粗糙度的变化。光谱反射率会受到土壤表面含水量和地表粗糙程度的影响,但是当土壤含水量达到饱和之后,此时地表粗糙度将会成为制约光谱反射率变化的主要因素。

Through the indoor artificial simulated rainfall method,the essay conducted the research on the micro topography changes and coupling mechanism of spectral curve of typical soil at the Danjiangkou Reservoir under the precipitation conditions and obtained the corresponding characteristics between them,taking the three types of soil as research subjects including the red sandstone purple soil,purple shale purple soil and pelite yellow brown soil.The result of the research shows that,there is the relation between the land surface roughness and the soil characteristics.During the rainfall process,the raindrop and the soil crust also affect the changes of the land surface roughness.The spectral reflectance would be affected by the water content and the degree of land surface roughness,however,when the water content of soil reach the saturation,the land surface roughness degree would be the main factor restricting the change of spectral reflectivity.