Simulation Research On Eco Hydrological Effects Of Vegetation Restoration In The Pai Lougang Stream Of Maoli Lake,Jin Shi City,Hunarn Province

Landscape planning and construction can not be separated from the relationship between plants and hydrology.As an important part of the wetland ecosystem in the Dongting Lake Basin,Mali Lake,Hunan Province,has important theoretical and practical significance to explore the impact of land cover changes on the ecological hydrological effects of the basin in the context of ecological civilization construction and the development of vegetation restoration projects..This study used the Pai Lougang small watershed of Maoli Lake in Jinshi,Hunan as the research object,and established different vegetation restoration scenarios in the river basin.The SWAT eco-hydrological model,which has a high adaptability in small and medium scale basins and can effectively reflect the impact of vegetation changes on the hydrological and hydrological effects of the basin,was selected as a research tool for this thesis.The model database of the archway Gangxi small basin was constructed with the support of ArcGIS software platform,and the model database of Pai Lougang small watershed was constructed with the support of ArcGIS software platform.Based on the daily average meteorological data of the river basin from 1980 to 2010,the SWAT model was used to simulate the current vegetation pattern in the Pai Lougang watershed and the eco-hydrological process of the next year under different vegetation restoration scenarios..The hydrologic factor response under different vegetation scenarios was analyzed quantitatively and analyzed from the perspective of ecological hydrology and vegetation restoration.Through quantitative calculation and analysis of the response of hydrological factors under various vegetation scenarios,the impacts of land use and vegetation pattern changes on the ecological hydrological process of the river basin and the regulatory mechanisms were analyzed from the perspective of ecological hydrology and vegetation restoration.Comprehensively compare the ecological and hydrological effects of various vegetation restoration scenarios.The purpose is to select a vegetation recovery plan with superior ecological and hydrological effects for the small stream of the Pai Lougang,and to provide basic theories and decision-making basis for future vegetation restoration planning and water resources environmental management of the basin.The main findings of this paper are as follows:Through the significant test of the hydrological effects of different vegetation restoration scenarios in the watershed and using the new Duncan analysis method,the change of vegetation pattern has little effect on evapotranspiration,water production,and soil water content.Scenario 5 is highly significant in reducing surface runoff,sediment yield,total nitrogen and total phosphorus load relative to the status quo;Scenario 3 shows significant decrease in surface runoff on the current situation scenario,and the amount of sediment and nitrogen and phosphorus pollutants are significantly reduced;Scenario 2 shows significant reductions in surface runoff,sediment load,and reduction of nitrogen and phosphorus pollutants relative to the current situation;The worst case 4 is insignificant.Significant differences in ecological and hydrological effects Scenarios 2,3,and 5 are all superior to the current situation(scenario 1),and scenario 5 is the most significant,followed by scenario 3 and scenario 2,and scenario 4 has no significant ecological benefits.Through the analysis of ecological hydrological processes of different hydrological factors under different vegetation restoration scenarios and the ecological water effects of different vegetation types in different scenarios,the correlations between various eco-hydrological effect indicators were analyzed.Examine the significance of the hydrological effects of different vegetation restoration scenarios.In the end,the results were all consistent:In each vegetation restoration scenario,the best recovery scenario for the eco-hydrological effect is scenario 5,followed by scenario 3,and the third scenario 2.The worst is scenario 4.