A STUDY ON NON-DESTRUCTIVE METHODS FOR ESTIMATING ABOVEGROUND BIOMASS OF GRASSLAND PLANT COMMUNITIES
草地植物群落地上生物量非破坏性估测方法的探讨

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.