冀北山地3种典型林分类型物种多样性研究

Species Diversity of Three Typical Forest Types in the Mountainous Area of Northern Hebei Province

以围场县木兰林管局3种典型森林植被类型为研究对象,从乔木层、灌木层和草本层分别对其物种数和多样性进行了比较。结果表明:落叶松桦木混交林内植物种类有56种,山杨桦木混交林内有53种,油松蒙古栎混交林有44种,乔木层物种多样性差别不明显,灌木层生物多样性指数总体上油松蒙古栎混交林>山杨桦木混交林>落叶松桦木混交林。草本层生物多样性指数除Simpson指数外,其他3个指数规律一致,即油松蒙古栎混交林>山杨桦木混交林>落叶松桦木混交林。

Taking three typical forest vegetation types in Mulan State-owned Forestry Administration of Weichang County as research object, their species ＆ diversity were compared from tree, shrub＆ herb layer. Result shows that： there are 56,53 ＆ 44 kinds of plants in mixed forest of Larix principic-rupprechtii and Betula sp. , mixed forest of Populus davidian and Betula sp. , mixed forest of Pinus tabuliformis ＆ Quercus mongolica, respectively; species diversity of tree layer has little difference;the order of diversity index for shrub layer is：mixed forest of Pinus tabul- iformis ＆ Quercus mongolica〉mixed forest of Populus davidian ＆ Betula sp. ）mixed forest of Larix principic- rupprechtii ＆ Betula sp.. Laws of three other indices among biodiversity index of herbaceous layer are consistent except the Simpson index,namely, mixed forest of Pinus tabuliformis ＆ Quercus m ongolica 〉 mixed forest of Pop- ulus davidian ＆ Betula sp. ~mixed forest of Larix principic-rupprechtii ＆ Betula sp.