草地植物群落地上生物量非破坏性估测方法的探讨

 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。

A STUDY ON NON-DESTRUCTIVE METHODS FOR ESTIMATING ABOVEGROUND BIOMASS OF GRASSLAND PLANT COMMUNITIES

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.