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《Ecology and Environmental Sciences》 2012-09
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Spatial and temporal variation of vegetation carbon storage in Nansihu lake wetland from 1987 to 2008

YU Quanzhou1,2,3,ZHANG Zulu2,Lü Jianshu4,SUN Jingjie2 1.The Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;2.School of Population,Resources and Environment,Shandong Normal University,Jinan 250014,China;3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;4.The Key Laboratory of Coast and Island Development of Ministry of Education,Nanjing University,Nanjing 210093,China  
Using vegetation carbon density data of Nansihu lake wetland coming from field survey and previous literatures,and combining with Landsat TM/ETM+ remote sensing data of the three periods in 1987,1997 and 2008,this paper analyzed the spatial and temporal changing characteristics of wetland vegetation carbon storage in Nansihu lake wetland,mapped the vegetation carbon pattern figure,and calculated the area of various vegetation types and vegetation carbon storage in the three periods.The results of the study show that: in the early period of the study(1987),vegetation carbon storage pattern has obviously banded characters and its carbon storage increased from the center line of the lake to the tow edges of the lake,while in the later period(1997—2008),the carbon storage pattern is of fragmentation and eventually disappear.Throughout the whole study period,the patch area with high carbon storage levels constantly decreases,and the patch area with high carbon storage levels increased.The vegetation carbon storage kept stability in early phase and significantly reduces later;the mean wetland vegetation carbon storage in 1987,1997 and 2008 are 1.07 Tg C,1.08 Tg C and 0.64 Tg C,respectively.The wetland vegetation carbon storage increased 0.001 Tg C each year in early study period and reduced 0.04 TgC each year in later study period.The natural vegetation carbon storage continued to decline throughout the whole study period,while planted vegetation carbon storage increased firstly and then decreased,with presenting fluctuation.The paper argues that the changing characteristics of the carbon storage in Nansihu wetland are driven by the land use change principally.By analysing carbon dynamic balance of the study area,the decrease of vegetation carbon storage may lead to decline of wetland carbon sequestration capability,even may make wetland become a carbon source.
【Fund】: 国家重大水专项课题子专题“南四湖流域水环境调查、问题诊断及输水水质安全保障综合控制方案研究”(2009ZX07210-007);; 临沂大学水土保持与环境保育重点实验室开放基金项目(STKF201002)
【CateGory Index】: X173
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