邓下小流域植物多样性与主要植被类型土壤养分效应

Plant Diversity and Effect of Main Vegetation Types on Soil Nutrients at Dengxia Catchment of Hilly Area in Southern Jiangsu Province

以苏南丘陵区邓下小流域为研究区,针对目前小流域内植被物种多样性状况和水平,选择物种丰富度指数(S)、Shannon-Weiner指数(SW)、Simpson指数(SP)和Pielou均匀度指数(J)作为物种多样性的测度指标,分析不同植物群落结构特征。对流域内现有主要植被类型(茶园、杉木林、马尾松林、毛竹林、水田和旱耕地共6种)以0～10 cm,10～20 cm,20～40 cm和40～60 cm分层挖土壤剖面,分析各植被类型下土壤养分效应,以期为小流域综合治理与植被恢复中植被模式选择提供理论指导。

Taking Dengxia catchment of hilly area in southern Jiangsu province as study area, targeting at the present condition and level of plant species diversity, the indexes of species abundance （S）, Shannon-Weiner （SW）, Simpson （SP） and Pielou（J） were chosen to be determined as measure index of plant species diversity, and the struc-tu- ral characteristics of different plant community were analyzed. And soil profiles of the main existing vegetation types （tea plantation, Cunninghamia lanceolata, Pinus massoniana, Phyllostachys pubescens, paddy field and dry cropland） were dug into 4 layers, 0-10 cm, 10-20 cm, 20-40 cm and 40-60 cm, effects of soil nutrient in different vegetation were analyzed, so to provide theoretical guidance to vegetation restoration and reconstruction at the catch-ment comprehensive management.