The Study On Estimation Of Vegetation NPP Of Xiaerxili Nature Protection Area Based On RS And GIS

Along with RS, GIS and the computer technology fast development, carries on vegetation NPP using the remote sensing information and the GIS technology the reckoning research gradually to hasten maturely, becomes the leading direction of the NPP research. Carries on the estimation with the remote sensing model, not only has realized the vegetation NPP wide range, the multi-dimensional space and time fast monitor, moreover, may appraise the plant community correctly under natural condition productivity, in order to formulates the macroeconomic regulation and control policy and the stopgap policy for the department concerned provides the scientific basis.This article take the vegetation net primary productivity NPP remote sensing estimation and the analysis as the research content, take the geographical and ecological knowledge as the foundation, uses the RS, GIS technology method, comprehensived the multiple source informations as remote sensing spectrum data, the DEM data, the statistical data, the locating point measured data and so on, have constructed the NPP remote sensing topographical model in, calculates the Xiaerxili nature protection area vegetation NPP in July. Its final goal is to complete Xiaerxili nature protection area vegetation net primary productivity quantitative and the appraisal . This dissertation includes following parts: First, Surveys on the spot about the mountainous region vegetation NPP of Xiaerxili nature protection area, provides the foundation data for the model construction;Second, NPP remote sensing topographical model construction. First withdraws the vegetation index information from the remote sensing phantom, then using DEM data take terrain factor information like elevation, slope, aspect and so on in research area, finally these informations and the actual NPP union, through the correlation analysis and the regression analysis, establishes NPP and the vegetation index, the terrain factor regression equation;Third, NPP reckoning. Xiaerxili nature protection area in July the NPP total quantity is: 7.1075×1010g/d, the mean value is: 5.4836 g/(m~2d), In its Xiaerxili local in July the NPP mean value is 7.2121 g/(m~2d), the frontier corridor mean value is 7.6795 g/(m~2d), the river Buss area mean value is 1.5594 g/(m~2d).The protectorate NPP maximum reaches 152.5010 g/ (m~2d);Fourth, NPP space analysis and change rule.NPP the overall tendency is changes in the spatial distribution along with the vegetation degree of coverage change, changes along with the ecology landscape change; no matter the vertical variation, the meridional change zonal change, after all has the tendency which NPP increases first reduces; No matter the vertical variation, the meridional change zonal change, NPP is 0 or the NPP minimum value all strongly appears above the elevation 3300 high cold areas.Presently, NPP estimated in the research, the majority models all take the climate, the soil, the moisture content construct the model as the main factor, or by the vegetation index union temperature, the precipitation, the soil and so on the non-terrain factor constructs the model, moreover the research criterion is big, studies mountainous region small criterion NPP using the terrain factor and the vegetation index union construction model not to see.In a sense, this article is carrying on one kind of new attempt, the technology and the theory also has certain problem.