呼伦贝尔沙化草原植被覆盖度估算光谱模型

选用美国ASD公司F ieldspec光谱仪,在内蒙古呼伦贝尔高原中西部的沙化草地进行了高光谱遥感地面观测以及草地植被覆盖度测定。运用回归分析方法,建立归一化植被指数(NDVI)与植被覆盖度(fc)之间的地面光谱模型。基于决定系数(R2)判断,拟合较理想的模型为乘幂模型和指数模型,R2分别达到0.752和0.716。误差分析显示指数模型和幂函数模型拟合误差较小。综合分析后确定选用乘幂函数作为研究区植被覆盖度估算模型(fc=0.7479*NDVI1.1928,R=0.86,p<0.001)。该模型为呼伦贝尔沙化草地区域植被覆盖度测定提供了新的技术方法。

The Ground Spectral Model for estimating vegetation coverage on desertified grassland,Hulunbeier,Inner Mongolia,China

ASD Fieldspec3 Spectroradiometer was used for the spectral measurements of Desertification grassland on the Midwest of Hulunbeier Plateau,for purpose of improving the research and application of hyperspectral remote sensing to estimate the grassland vegetation coverage.The ground spectral models were built for estimating above-ground normalized difference vegetation Index(NDVI)by the one-sample linear regression method,the nonlinear regression method and exponential model.According to the coefficient of determination(R2),the better fitting models were power model and exponential model,R2 were up to 0.752 and 0.716 respectively.Error analysis showed that index model and power model were fitted batter.Comprehensive analysis was taken to determine the ground used as a spectral power function model,the cover model was for estimating vegetation cover fc = 0.7479 * NDVI1.1928(R=0.86,p <0.001).The model provides a new technology and methods of desertification grassland region of Hulunbeir for vegetation coverage determination.