应用生态学报2018，Vol.29Issue(2)：626-634,9.DOI:10.13287/j.1001-9332.201802.018
南四湖湿地景观格局脆弱度的时空分异特征
Characteristics of temporal-spatial differentiation in landscape pattern vulnerability in Nansihu Lake wetland, China
摘要
Abstract
With remote sensing images from 1985,2000 Lantsat 5 TM and 2015 Lantsat 8OLI as data sources,we tried to select the suitable research scale and examine the temporal-spatial differentiation with such scale in the Nansihu Lake wetland by using landscape pattern vulnerability index constructed by sensitivity index and adaptability index,and combined with space statistics such as semivariogram and spatial autocorrelation.The results showed that 1 km× 1 km equidistant grid was the suitable research scale,which could eliminate the influence of spatial heterogeneity induced by random factors.From 1985 to 2015,the landscape pattern vulnerability in the Nansihu Lake wetland deteriorated gradually.The high-risk area of landscape pattern vulnerability dramatically expanded with time.The spatial heterogeneity of landscape pattern vulnerability increased,and the influence of non-structural factors on landscape pattern vulnerability strengthened.Spatial variability affected by spatial autocorrelation slightly weakened.Landscape pattern vulnerability had strong general spatial positive correlation,with the significant form of spatial agglomeration.The positive spatial autocorrelation continued to increase and the phenomenon of spatial concentration was more and more obvious over time.The local autocorrelation mainly based on high-high accumulation zone and low-low accumulation zone had stronger spatial autocorrelation among neighboring space units.The high-high accumulation areas showed the strongest level of significance,and the significant level of low-low accumulation zone increased with time.Natural factors,such as temperature and precipitation,affected water-level and landscape distribution,and thus changed the landscape patterns vulnerability of Nansihu Lake wetland.The dominant driver for the deterioration of landscape patterns vulnerability was human activities,including social economy activity and policy system.关键词
南四湖湿地/景观格局脆弱度/分析尺度/空间统计学/时空分异Key words
Nansihu Lake wetland/landscape pattern vulnerability/analysis scale/spatial statistics/temporal-spatial differentiation引用本文复制引用
梁佳欣,李新举..南四湖湿地景观格局脆弱度的时空分异特征[J].应用生态学报,2018,29(2):626-634,9.基金项目
本文由国家自然科学基金项目(41171425)资助 This work was supported by the National Natural Science Foundation of China (41171425). （41171425）
