Estimation of Spatial Distribution of Carbon Stocks in Watershed Using Environmental Indicators

• Main Authors: Ya-Ting Li, 李雅婷
• Other Authors: Zhao-Yuan Lin
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5080023%22.&searchmode=basic

碩士 === 國立中興大學 === 水土保持學系所 === 107 === Intergovernmental Panel on Climate Change(IPCC) proposed that carbon stock is estimated by biomass method. It can estimate the carbon dioxide release and stock in terrestrial plant ecosystems, however it needs to be calculated in conjunction with land use map. In addition, land use maps cannot immediately reflect the status of land use. In this study, the carbon stock estimated by IPCC method and the carbon conversion coefficient is used to explore difference at different spatial scale. In addition, using satellite imagery to extract environmental indicators to establish a watershed carbon stock model, the spatial distribution of carbon stocks in watershed can be assessed immediately. Taking zhuo-shui river basin as sample area. Adopting the forest area of the land use map in 2008 .The carbon stock is calculated to be 34,645,687 tons with IPCC global scale; in addition, the estimation of carbon stocks is 29,754,705 tons with conversion coefficient of Taiwan. Based on regional scale, the carbon stock of global scale is overestimated by 16%. Mainly IPCC adopts temperate deciduous forest in United States as basis, which growth rate is relatively fast. The carbon stock of plant is divided into above and below ground, however non-plant growth area,wetlands,also contain large amounts of carbon. How to use environmental indicators to extract suitable area, and quantitative analysis of carbon stocks in different land use is extremely important. Landsat satellite imagery combined with DEM data are used to extract environmental indicators in this study,normalized difference vegetation index (NDVI) reflects plant photosynthesis, topographical wetness index (TWI) reflects soil depth. Wetland uses normalized difference water index (NDWI) to extract its area and indirectly estimate the carbon stock. Combined with three environmental indicators,trying to establish spatial distribution model of carbon stocks in watershed.Regression analysis shows that the model is positively correlated with IPCC estimates results(R2=0.897,p ＜0.01), considering vegetation index, the water index is also the key to reflect wetland carbon pool. The carbon stock estimation model established can quantify the spatial and temporal distribution of carbon stock in the watershed for reference by relevant units in resource conservation and disaster prevention.