杉木老龄林群落的种-面积关系1）

摘要

We established 3 600 m2 large plot to study the species-area relationship on old Chinese fir plantation .The changing trend of species-area curve for the community based on the nested plots method and quadrates combination method are al -most the same , while there are differences in the trees layer and shrubs layer , then the number of species increases with the increasing of sample area in both two methods and levels .Minimum sampling area of community , trees layer and shrubs layer are about 1 000-1 200 m2, 700-900 m2, and 1 200-1 300 m2.Model 2 and 6 (R2>0.81) are the best in fitting the species-area relationship of the community total woody plants , tree layer and shrub layer in the old Chinese fir plantation .%通过对3600 m2的大样地进行调查，对杉木老龄林群落的种—面积关系进行分析，结果表明：巢式样方法与组合样方法所绘出的群落所有木本植物的种—面积曲线变化趋势基本一致，乔木层与灌木层的种—面积曲线变化趋势存在一定差异，不同方法与不同层次的种—面积曲线均呈现出物种数目随样地面积的增大而增加的趋势；群落所有木本植物、乔木层及灌木层的最小取样面积在（1000～1200）m2、（700～900）m2和（1200～1300）m2；遴选出拟合杉木老龄林群落所有的木本植物、乔木层及灌木层种—面积关系较好的模型。