利用NDVI-Ts方法大尺度反演盐碱地土壤湿度的误差分析——以农田、草地为例Analysis of Large-scale Soil Moisture Retrieval Error in Saline-alkali Soil Based on NDVI-Ts Space——Taking Farmland and Grassland as Cases
娄利娇,刘宝江
摘要(Abstract):
土地盐碱化导致大面积土地资源的丧失,威胁生态的可持续发展,严重破坏了我们赖以生存的环境,因此用遥感手段监测土壤盐碱化有很大的现实意义。地面受不同的植被所覆盖,特别是在大尺度下植被类型纷繁复杂,利用遥感数据通过传统的NDVI-T s特征空间来反演大尺度下土壤湿度时往往会增大反演误差。本文使用landsat8数据,考虑到不同植被对NDVI-T s特征空间的影响,分别建立了农田和草地覆盖下的特征空间,并结合地面实际测量的土壤湿度数据,分析干旱植被指数(TVDI)与实际土壤含水量的相关性,并以此来反映传统NDVI-T s特征空间引起的在大尺度反演土壤湿度的误差。结果发现:整体区域为0.16,农田为0.22,草地为0.35;并分别通过了0.01、0.1、0.05水平的显著性检验。从以上的结论我们可以得到:在利用TVDI反演大尺度土壤湿度时,不能将所有的植被类型一起作为NDVI-T s特征空间来计算TVDI,不同的植被类型需要分开以提高土壤湿度反演的精度。
关键词(KeyWords): 盐碱地;植被覆盖类型;NDVI-T s特征空间;TVDI;土壤湿度
基金项目(Foundation): 国家自然科学基金(40576077);国家自然科学基金(41271351)
作者(Author): 娄利娇,刘宝江
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