The Response Of Non-point Source Pollution To LUCC In Wuliangsuhai Watershed

Recently, under the influence of global climate change, the human beings arefacing serious environmental problems. Land Use/Cover Change (LUCC) is theperfect entry point of the study between natural and humanity procedural for it is theresult of human activities and natural factors, which is also a hot issue in the field ofthe global change study. The resources of water environment pollution in watershedare point source pollution and non-point source pollution. At present, the non-pointsource pollution problem is a hot topic as the control and management technology ofpoint source pollution is quite mature. Non-point source pollution is the major factorwhich leads to the serious water environment problem in China. Agricultureproduction is the main source of non-point source pollution because of the charactersof non-point source pollution. Thus the main factor which influences the severenon-point source pollution in Wuliangsuhai Watershed is its farming and stock raisingbeing its major industry to promote economic development. Consequently, study onthe response of non-point source pollution to LUCC in Wuliangsuhai Watershed couldprovide scientific evidence and theory support to manage and control local waterenvironment and plan land use structure in the future, and it also provides a set ofeffective research method on studying the water environment effect of LUCC. Thisresearch is aimed at studying the response of non-point source pollution to LUCC inWuliangsuhai Watershed, that is a research on how its non-point source pollutionrespond to the change of LUCC in the watershed through setting different LUCCscenarios. The main research contents are as followed:(1)Firstly, We got the physical geographic data, social economic data andhydrometeorological data through remote sensing interpretation, field investigationand literature survey in Wuliangsuhai Watershed. Then we established HSPFhydrological model in Wuliangsuhai Watershed, and simulated the non-point sourcepollution in the study area in2009, the simulated results showed that non-point sourcepollution is related to the land use type.(2)After that, we set up three different LUCC scenarios-tendency increase scenario, environmental protection prior scenario and economic development priorscenario according to the driving factors of land use change which we got from thecollected data before.(3)Meanwhile, based on the three LUCC scenarios and driving factors, weestablished the LUCC dynamical model and simulated the land use transformation inthe next30years under three LUCC scenarios with the base year of2000and2005with data from remote sensing interpretation. The simulation result is considered asthe LUCC parameters in HSPF hydrology model to simulate the hydrologic process inthe future in Wuliangsuhai Watershed.(4)Finally, applied the projected future land use transformation data under thethree scenarios of WLSH watershed as the LUCC parameter of the HSPFhydrological model to simulate the future hydrological process, we estimated thenon-point source pollution in Wuliangsuhai Watershed in the year2030to reflect itsresponse to LUCC.The main result is that under the tendency increase scenario, the non-pointsource pollution is about5152ton in total nitrogen and670ton in total phosphorus inWuliangsuhai Watershed in2030, and4808ton in total nitrogen and625ton in totalphosphorus and6687ton in total nitrogen and871ton in total phosphorus in2030under the environmental protection prior scenario and economic development priorscenario respectively.