竹＋草植被恢复模式斑块特点及其干扰分析

苦竹＋牛鞭草退耕种植5年后，苦竹与牛鞭草呈斑块分布状态．调查分析表明：牛鞭草中的苦竹斑块受人为影响较大，表现出斑块数量、斑块密度和边界密度均大于苦竹林中的牛鞭草斑块，斑块分维数则小于苦竹林中的牛鞭草斑块；而苦竹林中牛鞭草的生长受苦竹林所围成的斑块分维数、边界密度的增大和面积的减小影响逐渐消失；苦竹林中有牛鞭草分布的最小斑块面积在2．4～6．2m2之间，具体需视斑块分维数和边界密度大小而定．本调查分析在一定程度上可为现实的竹斑块、草斑块的经营管理布局提供参考．

Patch Characteristics of Pleioblastus Amarus + H. compressa Restoration Mode and Interference Analysis

After 5 years' growth of farmland planting for pleioblastus amarus+ H. compressa,they take on patch distribution status.The investigated results show that pleioblastus amarus patches are greater influenced by human impact,of whose patch number,patch density as well as boundary density are all bigger than H. compressa patch in pleioblastus amarus jungle,while fractal dimension is smaller than that of grass patch in pleioblastus amarus jungle.H.compressa in pleioblastus amarus jungle gradually disappear influenced by gradual increase of patch fractal dimension,boundary density and its decrease of area.The area of the smallest patch of the grass in pleioblastus amarus jungle is from 2.4 m2 to 6.2 m2 and the specific area depends on the specific patch fractal dimension and boundary density.This investigation is just a preliminary discuss,which made a certain foundation for realization of operation,management and layout of the two to a certain extent.