微孔草的分布及植物群落特征研究

A STUDY ON THE DISTRIBUTION AND POPULATION CHARACTERISTICS OF MICROULA SIKKIMENSIS

采用定量样地法，对微孔草这一特种油料植物的群落结构、群落变异以及群落特征进行了研究。结果表明，微孔草干物质生产量占总量的比率，休闲地为９．１６％、撩荒地为１６．９０％、油菜地为１５．３２％、燕麦地为１０．６６％、青稞地为５．９７％；群落系数相应为８７．０９％、８７．９１％、９１．８２％、９５．６５％、９３．６０％；优势度相应为９．６０％、１３．４５％、１１．９９％、１６．６１％、７．１３％。经主分量分析，认为微孔草在休闲地、短期撩荒地、油菜地中具有生长优势，在燕麦地中呈维持生长态势，在青稞地中呈衰退趋势。

Guantative plot sampling was used in this study to investigate Microula sikkimensis, a special oil plant, on its population structure, variation and other characteristics. The results indicated that, the dry matter yield rate out of the total production was 9.16 percent for fallow land, 16.90 percent for waste alnd, 15.32 percent for rape seed, 10.66 for oats and 5.97 percent for highland barley, the population coefficients were 87.09, 87.91, 91.82, 95.65 and 93.60 percent respectively; Dominant degree were 9.60, 13.45, 11.99, 16.61 and 7.13 percent correspondingly. The principal component analysis indicated that, Microula sikkimensis had growth advantage on fallow land, short-term waste land and rapeseed land, had maintainance growth on ota land but showed declined growth on highland barley field.