青海云杉群落植物种群生态位初步研究

Niches of Plant Species of Picea crassifolia Communities

分土壤水分、海拔2个资源位、7个资源水平,采用生态位宽度和生态位重叠的计测公式,定量计测了祁连山青海云杉群落主要优势植物的生态位宽度和重叠值。结果表明,土壤水分资源位对物种生态位宽度的影响大于海拔变化对物种生态位宽度的影响;群落的优势种和建群种对环境的适应性较强,具有较宽的生态位,群落优势种平均生态位宽度为0.958 6-0.203 2,很好地表征了物种的生态适应性和分布的幅度;在土壤含水率、海拔资源位上,物种间生态位重叠发生的种对分别占90.72%、86.72%,表明植物种在土壤含水率资源位上存在着潜在的竞争。这种结果与生态位宽度的分析结果具有一致性。

With 2 resource niche （ soil moisture ＆ altitude） and 7 resource levels, niche breadth and niche overlapping formula were adopted to quantitatively study niche breadth and niche overlaps of Picea crassifolia communities in National Nature Reserve of Qilian Mountains. Result shows that the effect of soil-moisture-resource-niche is larger than altitude change on species niche breadth;dominant species and edificato have stronger adaptability and wider niche breadth. The average niche breadth of dominant species in the communities is 0.958 6-0.203 2 and shows ecological adaptability and distributing range of species very well; species of niche overlap in soil. moisture content and altitude resource status is 90. 72% and 86. 72% ;it shows that plant species have potential competition in soil moisture content resource niche. The result is the same as the analysis of niche breadth.