草业学报2016，Vol.25Issue(10)：11-20,10.DOI:10.11686/cyxb2015576
基于 HJ-1A 卫星数据的高寒草地氮素评估－以青海省贵南县及玛沁县高寒草地为例
Estimation of nitrogen content of alpine grassland in Maqin and Guinan Counties, Qinghai Province,using remote sensing
摘要
Abstract
Using data sourced from a hyper-spectrum imager (HSI)from an environmental mitigation satellite (HJ-1A)and ground observation during 2014 in Maqin and Guinan Counties,Qinghai Province,inversion mod-els were established for estimating the nitrogen (N)content of alpine grassland.The optimal inversion model was selected and the spatial distribution map of grassland N was analyzed in the study area.The results showed that there was a correlation between N and the original spectral reflectance,the first-order differential spectral reflectance and the continuum removed spectral reflectance of the original hyper-spectral image,and significant correlations between grassland N content and absorption feature band one (750.95 -791.95 nm)and absorp-tion feature band three (889.03-921.3 nm)were also found.The band depth index BD767.99 was able to es-timate N content with the greatest accuracy;the linear model was able to explain over 44% of the variation in N content.The spatial variation of N content in Guinan County was large;generally N content was higher in northwest and southwest than in the northeast.The spatial variation of grassland N content in Maqin County was low and grassland N content was also low.关键词
高寒草地/牧草品质/遥感监测/估测模型Key words
alpine rangeland/forage nutrition monitoring/hyperspectral remote sensing/estimation model引用本文复制引用
高金龙,孟宝平,杨淑霞,冯琦胜,崔霞,梁天刚..基于 HJ-1A 卫星数据的高寒草地氮素评估－以青海省贵南县及玛沁县高寒草地为例[J].草业学报,2016,25(10):11-20,10.基金项目
国家自然科学基金项目（31372367，41401472）和青海省科技支撑项目（2013-N-146-4）资助。 （）
