The Spatio-temporal Variability And Sources Identification Of Heavy Metals In The Sediments In Lake Wetland

As existing in our country’s largest rare birds in zhalong wetland and wetlandecological national nature reserve, nearly50years of human life, empoldering, cageaquaculture, tourism development, industrial activities such as production of the plaquespent wetland water resources, water self-purification capacity significantly reduced,heavy metal pollution is increasing, presents the zhalong wetland eco-environmentdegradation trend has attracted extensive attention in the environmental protectionsector. This around Lake wetland deposition real heavy metal pollution problem, selecttied Dragon wetland2010of LandsatTM remote sensing image, and topographic maps,and reserves planning figure and other text material for Foundation, respectively to tiedDragon wetland nature reserve within two a typical Lake wetland--Nanshan Lake andcrane Lake, and the near tied Dragon wetland nature reserve of sewage bubble asresearch object, global positioning system （GPS） positioning for field collection Lake ofsurface deposition real and the sedimentary rocks core, determination deposition real inthe Cr, and Mn, and Fe, and Co, and Cu, and Zn, and As, and Ag, and Cd, and Hg andPb,11species heavy metal, in remote sensing （RS） and GIS technology of support Xia,combination210Pbexof measuring years results, from time sequence Shang and spacescale Shang on three a Lake wetland deposition real heavy metal variation features forhas quantitative of research, assessment its pollution status, and discrimination itspollution sources, and discussion has land using on deposition real heavy metalspatio-temporal changes of effect, for wetland protection and management providesscience pursuant to. In this process the article mainly made the following findings:（1） The three Lake Wetland in surface sediment Central Cr, Mn, Fe, co, and Cu, Zn,As, Ag, Pb and Cd, and Hg etc11kinds of heavy metals content in space there aresignificant differences in the distributions. Combined analysis of variance and theresults compared with the background value of Zn, As, Hg3elements into threecommon contaminants in the sediments of lakes and wetlands, the average content ofwastewater foaming>> Nanshan Lake, and crane Lake. Nanshan As elements in thesediments of Lake pollution, followed by Cr, Ag elements; crane relative Cu elements in the sediments of Lake clear; sewage bubble in the Cr, Mn, Cd, Pb4is there is a degreeof heavy metal elements pollution, especially for Cd contamination was particularlynotable.（2） Three speciation of surface sediments of lakes and wetlands as a whole, Mn,and Co, and Cu, Zn, As, CD, Hg element higher percentage of extractable, descriptionof the7types of heavy metal bio-availability, once entered into the water, causingsecondary pollution, so there is a degree of potential ecological hazard.（3） Directly led to three different land use spatial pattern of heavy metals insediments of lakes and wetlands and the different sources. Nanshan lake basin to dryland, grassland, wetlands, dry-land area of more than70%, description of Nan ShanLake watershed agricultural region; crane Lake wetland, grassland; wastewater foamingbasin in saline-alkali soil. Vegetation cover better contrast crane Lake, weak soil andwater loss, and farmland to dry land, and to a lesser extent non-point source pollutionand sewage worst heavy metal pollution in foaming. Nanshan Lake around has largerange farmland often application large of organic fertilizer, as planting increasinglyextended produced of life sewage and fertilizer pesticide loss became As, and Cd,sources; crane Lake in the of Cu elements often for insecticide, and sterilization agentand the industrial production, is a is General and important of pollutants; and NanshanLake, and crane Lake different of is near tied Dragon wetland nature reserve, andaccepted Lindian County industrial wastewater and life sewage of sewage bubble, dueto Zn elements in industrial uses Shang is widely, most of Zinc salt are can dissolved Yuwater, So there is often a lot of Zinc salt in industrial waste water, and at the same time,with the increase of sewage water treatment plant, Cr, Hg element to different stateconstantly accumulation and enrichment of continued settlement.（4）²¹⁰Pb_ex the establishment of wetland of Lake sedimentary sequences ofsedimentary rock core, NSH, XHH, WSP sedimentary rock core respectively representthe three Lake wetland area since1829, as well as the sedimentary record since1933.Three a Lake of average deposition rate comparison for: sewage bubble (0.22cm· a^-1)>Nanshan Lake (0.18cm· a^-1)> crane Lake (0.15cm· a^-1), description three a Lakewetland of deposition environment clear different, except main was of basinprecipitation and runoff, natural environment conditions of effect outside, land usingway of different also change has natural of deposition process, makes heavy metal pollutants with deposition process speed up, rich set degree corresponding increases.（5） The three Lake wetland deposition real11species heavy metal of vertical tochanges features respectively for, sewage bubble in the Cr, and Mn, and Zn, and Ag, andCd, and Hg, and Pb elements, crane Lake in the Co, and Cu, and Zn, and Cd elements,and Nanshan Lake in the Mn, and Co, and Cu, and Zn, and As, and Ag, and Cd elementscontent respectively is gradually increased trend. Except As, Hg element in Nanshan inthe sediments of Lake has the highest average levels of external; other9elements arehighest in the water bubble.（6） In accurate meter years of Foundation Shang, analysis has three a Lake wetlandsedimentary rocks core in the of11species heavy metal vertical to changes features, andcombination surface deposition real heavy metal space changes view: crane lake basin islocated of tied Dragon nature reserve of tourism, and tied Dragon Township of modernagricultural, of quickly development not only involves has different land using way ofchange, while spread to Lake Environment, effect its water environment quality. Evilwas badly damaged and the sewage soaked environment around large industrialenterprises and the rapid development of modern agriculture to the Lake environmentalso have a greater impact. Nanshan modern agriculture developed in the lake basin,irrigation area is large, agricultural non-point source pollution caused by pesticides,fertilizers, and water culture can also be a source of heavy metal inputs. Therefore, threespatio-temporal change characteristics of heavy metals in the sediments of lakes,historical sources and pollution and land use coincide in their stage of economicdevelopment, this research may include Lake Wetland eco-environment in the songnenplain provided renovation and improvement of basic data.