海南草地的生物量研究

作者用收割样方法,测定了海南草地的现存量.矮草草地地上现存量(干重)0.18～0.42公斤/米~2,地下现存量约0.24公斤/米~2;中草草地地上现存量0.46～0.90公斤/米~2,地下现存量约0.49公斤/米~2;高草草地地上现存量0.81～1.40公斤/米~2,地下现存量约0.49公斤/米~2.草地现存量和土壤、气候及生物因子有密切关系.P C A及回归分析表明,在生物因子影响相近的情况下,现存量主要由土壤肥力决定,尤以速效钾、氮的作用最显著.

A STUDY ON THE BIOMASS OF THE GRASSLAND IN HAINAN ISLAND

This paper deals with the standing biomass of -the grassland in Hainan Island. Aerial standing biomass of the short-grass grassland lies between 0.18 and 0.42Kg/m2, that of the mid-grass grassland, between 0,46 and0.90Kg/m2, and that of the tall-grass grassland,bet ween 0.81 and 1.40Kg/m2. Below-ground standing biomasses of short-grass grassland, of mid-grass grasslandand, and of tall-grass grassland are about 0.24Kg/m2,0.49Kg/m2 and 0.49Kg/m2 respectively. The standing biomass is closely related with the soil, the climate and the anthropogenic influence. PCA and regression analysis indicate that with similar intensity of anthropogenic influence, the standing biomass is mainly determined by soil fertility, particularly the active-K and active-IS,