沙溪流域永安段景观指数筛选与景观变化分析  

Selection of Landscape Indices and Landscape Changes Analysis of the Sha River Watershed in Yong′an

作　　者：李君[1] 戴文远[1] 杨红玉[1] 杨扬[1] 黄子元[1] 

机构地区：[1]福建师范大学地理科学学院,福州350007

出　　处：《亚热带资源与环境学报》2012年第4期87-94,共8页Journal of Subtropical Resources and Environment

基　　金：福建省自然科学基金项目(2009J01212)

摘　　要：以沙溪流域永安段为研究对象,利用RS、GIS技术,解译遥感影像获得的研究区景观类型分布图.运用Fragstats软件计算出研究区23个景观指数,根据相关分析和因子分析法对景观指数进行筛选,并据此对景观格局变化进行定量分析,结果表明:1)可用斑块类型的面积及幅度特征因子、形状复杂性因子、空间分布特征因子3个公因子表达23个景观指数的主要信息.2)从景观格局特征分析可以看出林地类型20 a来优势度减少,形状趋向于规则且分布趋于集中;耕地类型面积逐渐减小且分布趋于集中;建设用地面积增大,聚集程度及连接性均有所增加.这种变化过程说明研究区景观受人为干扰较大,反映出流域内生态环境较为脆弱,应采取相应的管理措施,以实现景观生态系统的整体优化,达到保护生态环境的目的.The study interprets Landsat TM remote sensing images with RS and GIS to obtain a distri- bution map of landscape types of the Sha River watershed in Yong＇an. By Fragstats software, 23 inde- xes concerning landscape pattern of study area are worked out. And the indices are screened according to correlation analysis and factor analysis, by which a quantitative analysis can be done to indicate landscape pattern changes of the area. The main conclusions are as follows： 1 ） The three common factors, including the factor of area and extent characteristics, the factor of shape characteristics and the factor of spatial distribution characteristics, can explain the main information contained in the 23 indices; 2） woodlands are dominant in the landscape with a regular and centralized structure, culti- vated lands are decreasing in number and increasingly centralized in structure, all showing deep influ- ences from anthropogenic interference. Since the eco-environment in the study area is fragile, appro- priate solutions should be taken to implement overall landscape ecosystem optimization and eco-envi- ronmental preservation.

关 键 词：GIS 景观变化 相关分析法 因子分析法 沙溪 

分 类 号：Q149[生物学—生态学]