湘西北蜡梅的生态位

在模糊超体积生态位理论的基础上，根据样地调查所获得的基本数据，研究了湘西北蜡梅群落中8个物种的生态位．结果表明，生态位宽度从大到小依次为：蜡梅（0．8479）、香叶树（0．5833）、八角枫（0．5761）、黄连木（0．5000）、崖花海桐（0．4500）、鸡仔木（0．4205）、珊瑚朴（0．3135）和樱桃（0．3056），与Simpson指数和Shannow-Wiener公式的结论相同；蜡梅生态位在其他物种的生态位的重叠值都很大，最小的为0．8382，说明其他物种对资源利用受到蜡梅的激烈竞争；其他物种生态位在蜡梅生态位的重叠值都比较小，最大的为0．6278，说明蜡梅对资源利用受到其他物种的竞争并不十分激烈，因而蜡梅是湘西北蜡梅群落中的优势物种．

Niche of Chimonanthus praecox in northwestern Hunan province

Based on the theory of fuzzy hypervolume niche,8 species' niches of Chimonanthus praecox community in northwestern Hunan province are studied according to the basic data of the samplings.The results indicate as following:niche width of these species can be ordered as Chimonanthus praecox(0.847 9),Lindera communis(0.583 3),Alangium chinensis(0.576 1),Pistacia chinensis(0.500 0),Pittosporum truncatum(0.450 0),Adina racemosa(0.420 5),Celtis ullunae(0.313 5),and Prunus pseudocerasus(0.305 6),which are analogous to the results of Simpson index and Shannow-Wiener formula;Niche overlaps of Chimonanthus praecox's niche overlapping any other species' niches are large in the mass which show Chimonanthus praecox intense competing for resources with any other species because of the minimum 0.838 2;Niche overlaps of any other species overlapping Chimonanthus praecox are small in the mass which show any other species not intense competing for resources with Chimonanthus praecox because of the maximum 0.627 8.Therefore Chimonanthus praecox is the dominant species of Chimonanthus praecox community in northwestern Hunan province.