元谋干热河谷不同人工林林下物种多样性的研究

通过样地调查,运用丰富度、多样性、均匀度等指标,研究了元谋干热河谷不同人工林林下植物的物种多样性。结果表明:(1)人工林层次单一,林下植物种类较少,主要是禾本科、菊科、蝶形花科的植物,样方中出现最多的物种为扭黄茅、牛毛毡、车桑子等,人工林下的植物种数低于对照(荒山荒地);(2)Shannon-W iener指数的变化值在0~2.172 9之间,指数最大值出现于阴坡的赤桉纯林,阳坡的柠檬桉纯林、大叶相思纯林和马占相思纯林最小;S impson指数变化在0.244 7~1.0之间,该指数变化与Shannon-W iener指数相反;均匀度指数变化在0~1.0之间,该指数变化趋势与Shannon-W iener指数基本一致,而与S impson指数相反。

A Study on Species Diversity of Plantations in Yuanmou Dry-hot Valley

An investigation was conducted on the species diversity of different plantations in Yuanmou dry-hot valley.The results are described as follows:(1) The layers of the plantations were single and species were few. The species mainly belonged to the families of Poaceae asteraceae,Papilionaceae,Heteropogon contortus,Eleocharis yokoscensis,Dodonaca viscose were very frequently observed.The number of species among different plantations was fewer than those on wild land.(2) The variation of Shannon-Wiener index among plantations were 0~2.172 9.The Eucalyptus camaldulensis pure forest situated on the northern slope got the biggest Shannon-Wiener index of 2.172 9,and the Eucalyptus citriodon pure forest,Acacia auriormispure forest and Acacia mangium pure forest situated on the southern slope had the smallest indexes.The variation of Simpson index among plantations was 0.244 7~1.The variation of Simpson index was contrary to the Shannon-Wiener index.The variation of evenness index accorded with Shannon-Wiener index and was contrary to Simpson index.