摘要
羊草群落的高度和盖度与地上生物量存在良好的复相关关系(R=0.9316),所获多元回归方程可用于该群落地上生物量的估测。通过对羊草群落、羊草+杂类草群落和贝加尔针茅群落植冠红光(0.63-0.69μm)和近红外辐射(0.76-0.90μm)反射率实测数据的分析,表明这些群落的光谱反射率比IR、IR/R和VI与地上生物量呈高度的指数相关关系,其中由VI和IR/R所获各群落不同生长时期地上生物量回归模型的估测效果较好。
Height and coverag of Aneurolepidium chinense community had a goodcorrelation with its biomass above ground(R=0.9316). A multivariate reg-ression equation was established for estimating aboveground biomass of thecominunity. Data of spectral reflectance for simulated band 3 (0.63-0.69um) and 4 (0.76-0.90um) of thematic mapper or landsat 4 or 5, were co-llected with a handheld radiometer in three principal grassland plant co-mmunities (Aneurolepidium chinense community, Aneurolepidium chinense+forbscommunity and Stipa baicalensis community) during plant growing seasons in1988. The study showed that vegetation index(VI)had the best exponentialcorrelationship with aboveground biomass in comparison with that of IR orIR/R for each of the communities. Therefore, with change of the growingseasons nine different spectral models related to VI for estimating above-ground biomass of the communities were established.
基金
国家自然科学基金资助项目"松嫩平原植被分类与立地类型研究"的一部分
关键词
草地植物群落
地上生物量
估测方法
Height
Cover
Vegetation index
Model
Aboveground biomass
