山西北部沙棘群落优势种群生态位研究

采用Shannon-W iener指数和Petra itis方法研究了山西北部沙棘群落25个优势种群的生态位宽度和生态位重叠.认为生态位最宽的是沙棘和铁杆蒿(分别为3.4607和3.2480),对环境具有广泛的适应性;生态位最窄的是胡枝子和美蔷薇(分别为0.1536和0.2134),对资源的利用有较强的选择性.沙棘和铁杆蒿之间重叠值最大(SO=0.818),沙棘和铁杆蒿在其它种群上的特定重叠远远小于其它种群在沙棘和铁杆蒿上的特定重叠.生态位特定重叠的大小与种群在群落中所占据的地位、生态学特性、种群分布情况都密切相关.25个优势种群之间不存在完全普遍重叠,主要是由于它们的生态学特性以及对环境的适应能力不同所致.

Niche Characteristics of Dominant Species in Hippophae rhamnoides subsp. sinensis Community in North Shanxi

The niche breadth and niche overlapping of 25 dominant species in Hippophae rhamnoides subsp.sinensis communties in North Shanxi were studied by using Shannon-Winener index and Petraitis methods.The results showed that the niche breadths of Hippophae rhamnoides subsp.sinensis and Artemisia sacrorum(3.4607 and 3.2480 repectively) were the widest while Lespedeza bicolor and Rosa bella(0.1536 and 0.2134 respectively) were the narrowest,which resulted from the former adapt to enviroment extensively and the latter utilize the resources selectively in some degree.The specific niche overlapping between H.sinensis and A.sacrorum was the biggest(SO=0.818).The specific overlapping of H.sinensis and A.sacrorum on the other populations were much less than that of the others on H.sinensis and A.sacrorum.The values of specific overlapping were related to species status in communities,its ecological characteristics and distribution.There was not absolutely general overlapping among 25 dominant species in communities and the reson was due to the differences in ecological characteristics and the capability of adapting enviroment.