Vegetation Interpretation And Biomass Evaluation And Estimation Of The Expressway Based On 3S Technology

To accelerate the Development of the the construction of west-strait economic zone, the construction and improvement of the traffic and transport networks in Fujian province has become the important link of accelerating economic development,especially the construction of the expressway. By taking the expressway from Taining to Jianning which is one part of the Fujian expressway net as the research object,by taking the remote sensing imagines which have two phases including December 2006 and May 2007 cover all regions of two counties Taining and Jianning as basic data source, We do the vegetation interpretation and evaluation on the expressway study area from Taining to Jianning in Fujian Province using RS and GIS technology. By comparing the four methods:Unsupervised classification, Supervised classification,Overlay classification, Visual Interpretation, We not only classify and evaluate the appraisement district vegetation types, but also calculate the areas and analysis the four results.The results showed that:four classification methods each has merits and demerits, in which Overlay classification has very similar results with the Visual Interpretation's. It is the most efficient and has the merits such as simple operation, convenient use,high precision and high reliability etc.A total of 29 quadrats were set up,there were also 10 supplementary verify sampling points. After Extracting and analysiting the vegetation index and DN values of the remote sensing imagines, We processed datas of the sample plots,and established the linear regression model of vegetation biomass of the researching area combined with the result of the vegetation type interpretation. Using Kriging Regression,the estimation results is much more accurate, the results showed that:the total vegetation biomass in the expressway researching area is 3.4802 X 107t/hm2; the mean biomass is 228.7815t/hm2, the maximum biomass is 300.4502t/hm2; after the construction, the area of permanent land occupation is 484.75 hm2, the area of temporary land occupation is 176.6hm2, the gross floor area of the project is 661.35hm2 which will cause losses of biomass about 151304.6450t in the appraisement district,which accounts for 14.3742 percent of the total biomass. The result shows that:the construction of the project have relatively little influence to the vegetation in the evaluating scope,which is in the bearing threshold of the natural ecosystem.what is more,by doing the late vegetation restoration, the influence of the gross floor area of the expressway project to the vegetation will be effectively alleviated.