塔里木河上游景观破碎化的时空动态变化分析

本文以遥感影像资料为基础信息源,以GIS及Fragstats景观格局分析软件为数据处理和破碎化指数计算的工具,在分析了塔里木河上游2000年和2005年景观格局变化的总体特征的基础上,选择景观斑块密度指数、景观斑块数量破碎化指数、景观斑块形状破碎化指数、景观分离度指数等指标,对塔里木河上游2000年和2005年景观破碎化程度进行了不同角度的分析。结果表明:就整个景观而言,斑块数量减少而平均斑块面积扩大,景观分布趋于连片,景观破碎化指数趋于稳定和减小;同时由于绿洲内部城镇化,农田水利设施的发展及绿洲外围的不断扩张,局部地区景观破碎化现象亦存在。

Spatial-Temporal Dynamic Changes of Landscape Fragmentation in the Upper Reaches of Tarim River

Based on the remote sensing image data,and the analysis of the overall changing characteristics of landscape pattern of 2000 and 2005 in the upper reaches of Tarim River with the software tool of GIS and the Fragstats for data processing and indexes calculating,the landscape patch density indexes,the landscape patch quantity fragmentation indexes,landscape patch shape fragmentation indexes and landscape isolation indexes were selected for assessing landscape fragmentation.The overall changing situation of landscape fragmentation is as follows: the landscape patch number was reducing while the landscape area was expanding,landscape patch distribution tend to be connected.Meanwhile,as a result of the oasis interior urbanization,the irrigation and water conservation facility development and the oasis periphery unceasing expansion,landscape fragmentation was also existent both in the oasis periphery and within oasis.