伊春林区阔叶次生林乔木树种多样性

对小兴安岭伊春林区5个林业局的40块标准地阔叶次生林的群落结构和树种多样性进行了调查分析的结果表明:试验区样地共有木本植物12科17属22种。木本植物丰富度13~20种,其中演替层主林层更新层,树种重要值最大为山杨,其次为糠椴和水曲柳;林层多样性指数演替层主林层更新层;试验区多样性指数五营桃山新青翠峦上甘岭;均匀度指数主林层演替层更新层;试验区多样性指数五营翠峦桃山上甘岭新青。整体上树种组成复杂多样,软阔叶树种较多,硬阔叶次之,针叶树种不到5%,硬阔的更替趋势较明显。

Woody Plant Diversities of Broad- leaved Secondary Forest in Yichun Forest Area

The commumtiy structure and woody plant diversities of broad - leaved secondary forest in five Forestry Bureau of Yichun forested area were assessed quantitatively by sample plot survey and diversity index analysis. The result showed that A total of 22 species of 12 families and 17 genera were recorded. Species Richness of woody plant was between 13 to 20 （succession layer 〉 main storey 〉 regeneration layer） . The sequence of shannon - weiner index from hign to low was succession layer, main storey, regeneration layer, and that of Pielou index was main stoery, succession layer, regeneration layer, the sequence of shannon - weiner and pielou index of Wuying test area was better than others. There were many tree species in whole, and speeies of soft-leaved was more than that of hardwood. The least species was conifer （ 〈5% ）.