Landscape Pattern Change and Its Driving Force of Nansihu Wetlands during 1987-2010
The change of landscape pattern and its driving forces in Nansihu wetlands were surveyed base on using the interpreted data of 5 remote sensing images in 1987,1995,2002,2006 and 2010.Annual precipitation and socioeconomic data (including the population growth,levels of industrialization and urbanization,and the living standards) and land-use landscape pattern map of the Nansihu wetlands from 2003 to 2010 were used in the study.These data were processed by remote sensing and geographic information system technology and the soft wares of ENVI 4.8,FRAGSTATS and SPSS.The results showed that under the double effect of climate change and human activities most of the natural wetlands were replaced by constructed wetlands from 1987 to 2010.The anti-interference ability and maintain self-stable ability of the Nansihu wetlands were degraded and landscape pattem tended to be broken; the biodiversity of the study was also decreased seriously.From 1987 to 2010,the patch number continues to increase,the patch density increased from 0.4 to 0.6; the landscape shape index showed an upward trend and the landscape contagion index showed a downward tendency.The values of the Shannon landscape diversity index and Shannon landscape dominance index fluctuated nearby 1.48 and 0.7.The landscape pattern of the wetlands was affected by natural factors and human activities.The population and economic development level were the most impact influence factors from human activities on landscape pattern.The importance order of influence factors from human activities was fishery output value,the proportion of primary industry,population,non-agricultural population,rural per-capita net income,GDP (gross domestic product),per-capita GDP,and the proportion of secondary industry.This study could provide the theoretical basis for adjustment of the agricultural structure and the land use structure optimization study for local government.
NETL
NSTL
万方数据
维普
