青海高寒区土壤光谱特性研究

摘要

The reflectivity of four kinds of soil samples in Qinghai alpline area was measured by ASD Hand Hold Spectroradiometer. The statistical analysis was made with organic matter content and ferric oxide content . The results show that the reflectivity of flowing aeolian sandy soil is greater than that of semifixed aeolian sandy soil, light chestnut soil and dark chestnut soil, and the content of organic matter is strongly correlative with absorption features of soil spectrum around 375 nm, 575 nm and 775 nm; Ferric oxide has a negative correlation with soil reflectance around 900 nm;The organic matter content has greater impact on soil reflectivity than ferric oxide.%以青海高寒区4种主要土壤类型为观测对象,利用ASD手扶式波谱辐射仪测定其土壤剖面光谱反射率,结合土壤有机质和氧化铁含量进行统计分析.结果表明:4种类型土壤的光谱反射率表现为流动风沙土＞半固定风沙土＞淡栗钙土＞暗栗钙土;土壤有机质含量与光谱反射率在375 nm波段、575 nm波段和775 nm波段附近有较好的负相关性;土壤反射率与氧化铁的负相关性在900 nm附近最强,有机质对土壤反射率的影响大于氧化铁.