次生林区斑块形状动态与森林恢复过程分析

以1959年以来4期航片为基础资料，在ARC／INFO支持下，分析丁关帝山天然次生林区森林恢复过程中各类景观要素斑块异圆指数和类斑边界分维数及其动态。研究表明，采用斑块异圆指数即可揭示景观要素斑块形状特征及其变化规律；研究地区景观恢复过程中，各类非林地斑块的异圆指数总体上高于林地斑块，但呈持续下降趋势，形状趋于规则；林地斑块的异圆指数呈持续上升趋势，景观处于活跃的森林恢复和斑块演替中期，演替后期森林斑块的扩展和合并过程始终占主导地位，斑块形状更趋复杂多变，相邻斑块间的联系密切，先锋性森林群落的斑块形状较为简单，斑块逐渐消退。为研究景观结构与功能的关系和变化规律提供了基础。

Analysis on the dynamics of patch shape and forest restoration process in Guandishan secondary forest region

Based on four stages of Ariel image since 1959,and supported by ARC/INFO,the similarity index to circle (SIQ) and fractal dimension (D f) of all types of landscape patches in Guandishan forest region were analyzed in this paper.The results showed that SIQ was efficient to analyze and explore the characters and dynamics of patch shape.During the process of forest landscape restoration in the study area,SIQ of non forest patch was always higher than the forest patch.The SIQ of forest patch increases persistently in the period.The patch shape became more complex.The landscape was in the middle stage of active forest restoration and patch succession,dominated by the extension and combination process of later succession forest patch,which had more complex and diversified patch shape and more close correlation with other patches.The early succession forest patches with comparatively simple shape gradually declined.