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资源科学  2011 

Forest Aboveground Biomass Analysis Using Remote Sensing in the Greater Mekong Subregion
基于遥感的湄公河次区域森林地上生物量分析

Keywords: Greater Mekong Subregion (GMS),Forest aboveground biomass,LiDAR,Optical remote sensing
大湄公河次区域
,森林地上生物量,激光雷达,光学遥感

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Abstract:

Forests play a key role in maintaining the regional environment and global carbon balance and mitigating global climate change. Forest aboveground biomass (AGB) is an important indicator of forest carbon stocks. Accurately estimating forest aboveground biomass can significantly reduce uncertainties in investigating the terrestrial ecosystem carbon cycle. The Greater Mekong Subregion (GMS) is rich in forest resources; changes in forest resources can affect regional and even global climate change. It is therefore important to estimate forest AGB in this region. Remote sensing is an efficient way to estimate forest parameters over large areas, especially at regional scales where field data are scarce. Light Detection And Ranging (LIDAR) provides accurate information on the vertical structure of forests. Combining airborne LIDAR with spaceborne LIDAR for regional forest biomass estimation could provide a more reliable and quantitative information regarding regional forest biomass. In this study, the vertical structure of forest parameters of two forest farms in Yunnan Province, China, was derived using airborne LIDAR system (ALS). Regression models were built using field data of forest AGB and percentiles of canopy height and canopy density derived from ALS point cloud data. Forest AGB estimated from ALS with high accuracy were used as training data for building a forest AGB estimation model with ICESat GLAS waveform indices. Then the forest ABG was estimated at ICESat GLAS footprint levels in GMS. In terms of different types of ecological zones, a set of categorical regression models was built between ICESat GLAS estimates and MERIS spectral variables. Then, a forest aboveground biomass map with continuous biomass values was generated. Results show that: 1) integrating field measurements with airborne and spaceborne LiDAR data can be useful in effectively estimating forest aboveground biomass. Ten estimation equations were built using the regression decision tree method. The overall average error of the estimation models is 34 t/hm2, with a correlation coefficient of 0.7. 2) The estimation agrees well with the FAO FRA 2010 report and other published results, and the average difference is 13.3%. 3) The total forest aboveground biomass in GMS estimated from remote sensing data is 6.27 billion tons, consisting of 71% evergreen broadleaf forest, 10% deciduous broadleaf forest, 16% evergreen coniferous forest, and 3% mixed forest. 4) According to the total aboveground biomass map, Myanmar has the largest AGB in the region which account for 22% of the total regional biomass, followed by Yunnan Province in China, Laos, Thailand, Vietnam, Guangxi Zhuang Nationality Autonomous Region in China, and Cambodia.

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