东北草地羊草种群生态位的研究

计测了东北松嫩草原上羊草种群的资源生态宽度、生态位宽度季节变化，羊草与其它主要植物种群的资源生态位重叠，并在不同水平梯度上做了较深入的分析。研究表明：羊草种群水分生态位宽度主要取决于羊草的资源占据比例；光生态位宽度主要依赖于光能的利用强度；营养生态位宽度主要受生境土壤养分差异的影响；羊草生态位宽度存在着季节性变化；植物种群生态位的重叠值随土壤水分与碱化度梯度呈有规律变化，生态位重叠是该地域植物共存的基础。

Studies on the niche of Aneurolepidium chinense population on the northeastern rangeland

The resource niche width of Aneurolopidium chinense,its seasonal change and niche overlap with other main plants at different levels on the northeastern Songnen rangeland were measured and analysed. The results showed that water niche width of Aneurolepidium chinense was chiefly determined by the resource utilizing proportion by Aneurolepidium chinense;light niche width depended on the utilization intensity of light energy;nitrient niche width was chiefly influenced by the soil nitrient differences at habitat;Aneurolepidium chinense niche width has the seasonal changes; the overlap of plant populations' niches has a certain regularity with soil water and alkalization gradients.And the niche overlap is the basis of plant coexistence in this area.