Phosphorus is the limiting factor of Taihu Lake eutrophication and domestic sewage is its leading P source.In this regard,reducing phosphorus emission from urban section is an urgent priority.However,rapid urbanization in the watershed has a negative impact on the water quality improvement of the lake because most of the municipal effluent in the area is now discharged into river systems without or with only minor treatment.In this study,a system dynamic model was developed and applied in Yixing City,a case area in Taihu Lake watershed,to relate phosphorus emission and urbanization rate.Phosphorus generated in the case area will continue to rise with the urban expansion.Planned waste water treatment capacity can only slightly reduce P emission from its present level in the near future.The improvement of water quality of the lake lies largely on enlarged capacity of municipal domestic sewage treatment.The results of this study can be used as a theoretical base for realizing sustainable coordinative development between society,economy and environment in the area.
DAI Ke-Wei, GAO Chao, ZHU Ji-YE, QIAN Yi
. Impact of Urbanization on Phosphorus Emission in Taihu Lake Watershed——A Case Study in Yixing,Jiangsu Province[J]. SCIENTIA GEOGRAPHICA SINICA, 2007
, 27(2)
: 237
-242
.
DOI: 10.13249/j.cnki.sgs.2007.02.237
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