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Long Term Evaluation of Green Vegetation Cover Dynamic in the Atacora Mountain Chain(Togo) and its Relation to Carbon Sequestration in West Africa

查看全文 作　　者：Fousseni [1,2]FOLEGA;Yao Agbélessessi [1]WOEGAN;Dourma [1]MARRA;Kperkouma [1]WALA;Komlan [1]BATAWILA;Jean Leonardo [3]SEBURANGA;ZHANG Chun-[2]yu;PENG Dao-[2]li;ZHAO Xiu-[2]hai;Koffi [1]AKPAGANA 高影响力作者 机构地区：[1]Université de Lomé, Laboratoire de botanique et écologie végétale, Faculté des Sciences;[2]The Key Laboratory for Forest Resources & Ecosystem Processes of Beijing, Beijing Forestry University;[3]Department of Biology, Faculty of Science, National University of Rwanda高影响力机构 出　　处：《Journal of Mountain Science》索引2015年第12卷第4期,共14页高影响力期刊 基　　金：the Chinese Ministry of Sciences and Technology,the host of China-Africa Science and Technology Partnership Program(CASTEP);the special fund of forestry industry for public welfare projects(200904022) 摘　　要：The research was done in the Atacora Mountain chain in Togo which tended to assess the change of vegetation cover during a 24-year period.It also aims to evaluate the dynamic of the net primary productivity(NPP) of the living plants over the same period.The Landsat imagery covering three different periods(1987, 2000, and 2011) was pre-processed to correct atmospheric and radiometric parameters as well as gapfilling the 2011 SCL-off images.Then, the vegetation indices such as NDVI(normalized difference vegetation index), SR(simple ratiovegetation index), SAVI(soil-adjusted vegetation index), and CASA(carnegie- ames- stanford approach)model for NPP were applied on these images after masking the study area.The results showed a quiet decrease in the vegetation cover.The vegetation loss was more significant from 2000 to 2011 than from1987 to 2000, and anthropogenic activities can be deemed as the main cause of the vegetation loss.The biomass assessment by NPP computation also showed a decrease over the time.Similar to the change of the vegetation cover, the ecosystem net productivity was very low in 2011 compared to 2000 and 1987.It seems that the general health condition of thevegetation, including its potentiality in carbon sinking,was negatively affected in this area, which has already been under threatened.A perpetual monitoring of these ecosystems by means of efficient techniques could enhance the sustainable management tools of in the framework of reducing emissions from deforestation and forest degradation(REDD). 关 键 词：绿色植被 归一化植被指数 植被覆盖变化 西非 评价 净初级生产力 卫星图像 碳
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