DB63T 2047-2022高寒草地退化遙感監(jiān)測技術(shù)與評價方法

ICS07.060CCSA47青海省地63方標(biāo)準(zhǔn)DB63/T2047—2022高寒草地退化遙感監(jiān)測技術(shù)與評價方法青海省市場監(jiān)督管理局發(fā)布 附錄A(資料性)基準(zhǔn)數(shù)據(jù) 4 前言性引用文件定義程。4遙感數(shù)據(jù)選取譜影像。監(jiān)測技術(shù)遙感指數(shù)采用遙感模型法計算歸一化植被指數(shù)，見公式(1)。NDVI=pNIR——770nm~890nm波段的反射率；pR——620nm~690nm波段的反射率。pNIR?pRpNIR+pR··········(1)高寒草地覆蓋度監(jiān)測采用像元二分模型計算高寒草地覆蓋度，見公式(2)。VC·············································(2)VC——高寒草地覆蓋度；NDVI被指數(shù)；NDVIsoil——無植被覆蓋的裸土像元NDVI值；NDVIveg——全植被覆蓋像元NDVI值。高寒草地地上生物量監(jiān)測利用草地歸一化植被指數(shù)(NDVI)與實測地上生物量值建立的監(jiān)測模型計算高寒草地地上生物量，見公式(3)。B=a×eb×NDVI·······································································(3)BNDVI被指數(shù)；abab方法基準(zhǔn)數(shù)據(jù)以1982年~1991年遙感數(shù)據(jù)反演的植被覆蓋度和地上生物量作為基準(zhǔn)數(shù)據(jù)。詳見附錄A。高寒草地退化評價級1VC≥0.9VC1982~1991或B≥0.9B1982~199120.8VC1982~1991≤VC＜0.9VC1982~1991或0.8B1982~1991≤B＜0.9B1982~199130.7VC1982~1991≤VC＜0.8VC1982~1991或0.6B1982~1991≤B＜0.8B1982~19914VC＜0.7VC1982~1991或B＜0.6B1982~1991a高評分值區(qū)域草地退化評價GDI退化GDI·······························(4)Ai——草地退化等級i的分布面積；化等級GDI≤11＜GDI≤22＜GDI≤3GDI＞3草地退化趨勢評價草地退化趨勢高寒草地退化趨勢計算，見公式(5)。eslope=···················································(5)eGDIi——第i年區(qū)域草地退化指數(shù)。退化趨勢評價標(biāo)準(zhǔn)根據(jù)高寒草地變化趨勢(eslope)及顯著性檢驗劃分等級，見表4。趨勢顯著性檢驗采用F檢驗法。趨勢等級劃分θslope>0,F>F0.01θslope>0,F>F0.05F<F0.05θslope<0,F>F0.05θslope<0,F>F0.01附錄A(資料性)AA生物量基準(zhǔn)數(shù)據(jù)圖A.11982~1991年高寒草地覆蓋度基準(zhǔn)圖A.21982~1991年高寒草地地上生物量基準(zhǔn)參考文獻J報,2014,69:61-64[7]薛存芳,張瑋.基于MODIS數(shù)據(jù)的內(nèi)蒙古草地植被退化動態(tài)監(jiān)測研究[J].國土資源遙感,2009,2):97-101[10]