巴音布鲁克高寒草地主要植物种群生态特征分析

本文采用Levins提出经Corwell修正指数和王氏重叠指数,在土壤pH值和土壤全盐二维生态因子梯度上,测定了巴音布鲁克高寒草地20种主要植物种群生态位宽度和生态位重叠值。结果表明,细果苔草、珠芽蓼、线叶嵩草、羊茅等建群种和优势种的生态位最宽,适应土壤酸碱和盐渍化能力强,为泛化种;委陵菜、千叶蓍、草原老鹳草等伴生种生态位窄,适应酸碱和盐渍化能力弱,为特化种。在二维资源维上生态位重叠值最高的种对发生在轮叶马先蒿和斜生秦艽之间,重叠值分别为0.7808和0.861,但其生态位宽度均很窄,未达到0.3。与较大的生态位宽度其生态位重叠值也较大的结论不完全相符。

Analysis on Ecological Characteristics of Main Plants in Alpine Meadow of Bayanbulak

Applyed Levins Index corrected by Corwell and Wang gang Index,the niche breadth and niche overlaps of 20 species' in alpine meadow of Bayanbulak were measured at two resource dimension levels.It's shown that Carex stenocarpa,Polygonum viviparum,Kobresia capillifolia and Festuca ovina's niche breadth are wider;Potentilla sp.,Polygonum viviparum,Geranium pratense and others' niche breadth are more narrow.The former belong to extensive species,it is high in adapting to soil acid and salification,the latter belong to equilibrium species,it's adaptability is weaker than the former.The highest overlapped species occurr between Pedicularis verticillata and Gentiana decumbens,their volues are 0.7808 and 0.861 respectively,but their niche breadthes are below 0.3.Usually,the wider the niche breadth the bigger the niche overlaps,but our conclusion does not accord with it completely.