On The Influence Of Changes Of Hengshui Lake Water Income Quantity On The Wetland

Hengshui Lake Wetland holds relatively complete ecological system of one of the freshwater lake wetlands which located in North China Plain,Occupying a position of floodcontrol,water conservancy,climate regulation and preservation of biological diversityfunctions and maintains typical and rare ecosystem of lake wetland.The research of influenceof amount of water income on the wetland can provide the basis for preventing thedegradation of Hengshui Lake Wetland and development of Hengshui Lake protectionmeasures.This paper provides the analysis of relationship between water income of Hengshui Lake,wetland area,Wetland water quality and Wetland biological species and Guarantee of theincome water amount of Hengshui Lake Wetland.All base on gathering data of HengshuiLake water income, wetland water quality and wetland biological species and the adoption ofErdas,ENVI and Arcgis9.3soft wares for statistics of Hengshui Lake wetland area from1980to2010.The main research includes three parts:part one:Analysis of the dynamic change of the Hengshui Lake wetland in30years from1980to2010by remote sensing image interpretation and analysis,spatial analysis of GIS andhistorical data summary etc.part two:Analysis of influence Hengshui Lake water income change on wetlands,mainlyfrom aspects of wetland area,wetland water quality and wetland biological species.part three:Bring up specific measures for guarantee of Hengshui Lake wetland waterincome,base on the analysis results.The main results are shown in the following five aspects:1.Interpretate remote sensing images by using Erdas software and superviseclassification of wetlands concludes that the area and dynamic changes of Hengshui LakeWetland from1980to2010key years.Wetland area showed a slightly increasing trend before1983;Decrease in wetland area from1984-2003by1.9percent;Slow increase in wetland areafrom2004-2010by0.78percent.2. The influence changes with the changes of quantity of basin own drain, income drain flood and diversion water from Yellow River.The basin own drain influenced wetland areamore obviously from1980to1984, led to the increase of wetland area;the income drain floodinfluenced wetland area more from1985to1990,the total quantity showed slight reductiontrend, led to the decrease of wetland area;both basin own drain and income drain floodinfluenced wetland area obviously showed reduction trend and corresponding wetland areareduction;the diversion water from Yellow River influenced wetland area the most,thewetland area grew with the quantity of income water from Yellow River.3.The water quantity changes of basin own drain, income drain flood and diversion waterfrom Yellow River in different years influenced the water quality of Hengshui Lake Wetlanddiversely.The quantity of basin own drain influenced wetland water quality more,the wetlandcomprehensive pollution index reduced with the increase of basin own drain quantity before1990;quantity of basin own drain and income drain flood influenced wetland water qualitydirectly,the decrease of water quantity caused the rise of wetland comprehensive pollutionindex from1991to1993;quantity of diversion water from Yellow River and income drainflood influenced wetland water quality more,with the increase of income water the wetlandcomprehensive pollution index reduced and water quality improved from1994to1997;basinown drain,income drain flood and diversion water from Yellow River all influenced the waterquality of the wetland significantly and decreased,caused the rise of comprehensive pollutionindex of Hengshui Lake Wetland from1998to2002;the diversion water from Yellow Riverinfluenced the water quality of wetland mostly,the comprehensive pollution index reducedwith the increase of diversion water from Yellow River, the water body improvedsignificantly.4.Basin own drain and income drain flood influenced the biological species of HengshuiLake inconspicuously not the diversion water from Yellow River,the algae and zooplanktonincreased significantly after the diversion,of which algae increased two phylum,56genus and81genus for zooplankton.5.Bring up the measures of guarantee the water quantity into Hengshui Lake byanalyzing the influence of income water quantity to the wetland. Including increase theHengshui Lake water quantity in many ways,initialize ecological monitoring,reinforceremediation and management of diversion channels, strengthen upstream soil and water conservation of the wetland, control nutritional substances of lake area and appropriateimpoundment.