象限法在热带山地雨林群落学调查中的应用研究

 本研究用象限法对海南岛尖峰岭地区一个山地雨林林分作了群落学调查，并将所得结果与78.5%面积取样比的记数样地法调查结果及实测结果进行比较。56个点的象限法调查所得密度、平均胸高断面积、优势度、组成种数量及组成种重要值序是令人满意的，而所花费时间最多为记数样地法的40%。但对该林分来说，样点数不能依照象限法的设计者Cottam和Curtis的结论来确定，即平均距离调查所需的点数即为群落调查所需的样点数，而要依据平均胸高断面积调查所需的点数来确定。

RESEARCH ON THE USE OF POINT-CENTERED QUARTER METHOD IN PHYTOCOENOLOGICAL INVESTIGATION ON THE EXPERIMENTAL STAND OF A TROPICAL MOUNTANE RAIN FOREST COMMUNITY

The result obtained with point-centered quarter method by 56 sampling points was compared with the results obtained with actual measurement and count-plot method by 78.5% sampling ratio of area in phytocoenological investigation on a tropical mountane rain forest community in Jianfengling region, Hainan Island, The comparison showed that density,mena area at brest height, dominance, number of component species and order of I. V. of component species obtained with the point-centered quarter method were satiafactory for phytocoenological investigation. The advantage in speed with the point-centered quarter method was particularly great, with a saving of 60% or more in term of time spent by the count-plot method. But the determination on number of sampling points for the expenimental stand was not based on the conclusion, in almost all the cases, a sample of sufficient size to give an adequate sample of distances will produce an adequate sample of basal area as well, which was drawn by Cottam and Curtis, the designers of point-centered quarter method. The number of points required by adequate sampling of mean area at brest height was the number of sampling points for the experimental stand of the tropical mountane rain forest community.