Abstract:

Spatialtemporal dynamic changes in ponding and enclosure culture of the Taihu Lake especially the changes of lake area and lake enclosure culture in the east Taihu Lake were studied with the aid of Landsat TM,Landsat ETM+ and Alos image.The result showed that the area of land reclamation was 16.004 2 km2 in Lake Taihu from 1979 to 2008.The area of land reclamation was 9509 km2 from 1979-2001 and the area of land reclamation was 0.432 2 km2 peryear.The land reclamation was used for water aquaculture,and the area of ponding was 56.53% in total area of land reclamation from 1979 to 2001.The area of land reclamation was 6.495 2 km2 from 2001 to 2008,and the area land reclamation was 0.927 9 km2 peryear.The land reclamation was used for earthfilling cofferdam,and the area of earthfilling cofferdam was 5228% in total area of land reclamation.The scope of enclosure culture had become large since 1979 and the enclosure culture had bestrewed the whole of the East Taihu Lake today.The area of enclosure culture in 1979 was 83434 km2 and had increased 100.272 6 km2 since 2001,which occupied 7465% in total area of the East Taihu.Higher density of enclosure culture had become a big problem of water resource exploitation in the East Taihu Lake.Based on the analysis of the situation and problems of the ecological environment,some countermeasures were suggested for the exploitation of the lake