翅果油树群落优势种群生态位分析

应用Shannon-Weaver指数和Petraitis的方法，研究了山西翅果油树群落21个优势种群的生态位宽度和生态位普遍重叠和特定重叠，结果表明：翅果油树和黄刺玫的生态位宽度最大，这主要是由于它们具有广泛的适应性。翅果油树在其它种群上的特定重叠远远小于其余20种植物在翅果油树群种上的特定重叠值。21个优势种群之间并不存在完全的普遍重叠。主要与它们对水分和光照不同的适应性有关。草本植物之间的特定重叠大于灌木。21种植物仅有4个种对(本氏针茅和野古草、野古草与本氏针茅、本氏针茅与多花枸子木和金花忍冬与白刺花)之间存在完全的特定重叠。

Niche characteristics of dominant populations in Elaeagnus mollis communities,Shanxi

The niche breadth and niche overlapping of 21 dominant species in Elaeagnus mollis communities,Shanxi were studied by using Shannon-Weaver's index and Petraitis's methods.The results indicated that the niche breadths of E.mollis and Rosa xanthina were bigger than the others because these two species had extensive adaptation to environment.The specific overlapping of E.mollis on the other populations was much less than that of the others in E.mollis population.There was not absolutely general overlapping among all species in the communities,and the reason was resulted from the differences among them for adapting to moisture and light.The specific overlapping among herbs were more than that among those shrubs.Moreover,only 4 paired-species,Stipa bungeana and Arundinella hirta,A.hirta and S.bungeana,S.bungeana and Cotoneaster multiflorus,Lonicera maackii and Sophora viciifolia had absolutely specific overlapping.