The paper studied the niche features of dominant species in the communities of Paeonia suffruticosa var.spontanea using methads of Levins,Shaanon-Wiener coefficient of niche breadth and Petraitis coefficient of niche overlap,in the area of Majiagou,Jishan,Shanxi province;Shuiyukou,Yongji,Shanxi province;Wanhuashan,Yanan,Shaanxi province,Erxianqiao,Huayin,Shaanxi province.It is concluded that the niche breadth of Paeonia suffruticosa var.spontanea and other dominant species vary with the change of ecological factors,such as water conditions in soil,temperature,elevation and light.Water condition is the main ecological factor which affects the niche breadth.Paeonia suffruticosa var.spontanea and other 13 dominant species appear a certain niche overlap in the six communities.
野生大豆(Glycine soja Sieb.et Zucc.)属豆科(Leguminosae),为我国二级濒危保护植物。为给野生大豆种群保护提供科学依据,对北京地区野生大豆群落环境进行系统调查,通过对区域、生境和群丛组3种不同尺度下28个优势种生态位宽度和生态位重叠分析,结果表明:在3种尺度下,优势种的生态位宽度同频度有相同的变化趋势,频度越大,生态位宽度越大;在石质河床、土质河床和水库撂荒地3种不同基质生境下分布的野生大豆群落具有一定相似性,但在优势种组成上仍有差异;每个群丛组生态位宽度较大的物种在一定程度上可以代表其群丛组生境特点,生境条件影响物种分布;生态位重叠值较高的各种对,因为具有相似的生物学特征,对生境要求比较相近;生态位宽度较大的种群之间,生态位重叠值并不一定高。
