三江平原人工林天然化的生物多样性研究

采用 Shannon-wiener指数、Evermess指数和 Richness指数,对三江平原依兰县先锋林场的人工落叶松林进行了生物多样性的测度，并运用群落生态学方法，对不同群落不同层物种组成进行了研究，结果表明：定向抚育的落叶松人工林的多项指标，均高于一般抚育的落叶松人工林．这表明对落叶松人工林进行定向抚育，增加了人工林的生物多样性和提高了群落的稳定性．

Study on Biodiversity of Naturalized Plantation in Sanjiang Plain

Based on plenty of investigation and analysis of two community types at Xianfeng Foresty of Farm of Yilan County. By using Shannon-wiener index, Evenness index. analyzed the biodiversity of the two community types, at the same time. studied the structure of different layer of the community by the way and theory of community ecology. Furthermore,we got the result that the biodiversity index of naturalized larch plantation are higher than non-naturalized larch plantation. So plantation naturalizing is the good way to increase the stability and biodiversity of plantation.