Estimation of Above Ground Biomass in Forests Using Alos Palsar Data in Kericho and Aberdare Ranges
Estimation of Above Ground Biomass in Forests Using Alos Palsar Data in Kericho and Aberdare Ranges作者机构：Department of Geomatic Engineering and Geospatial Information Systems Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Division of Geomatics School of Architecture Planning and Geomatics University of Cape Town Cape Town South Africa Department of Forestry School of Natural Resources and Environmental Studies Karatina University Karatina Kenya
出 版 物：《Open Journal of Forestry》 (林学期刊（英文）)
年 卷 期：2017年第7卷第2期
页 面：79-96页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Above Ground Biomass Estimation Green House Gas Carbon Credits Alos Palsar Backscatter Cross-Polarization Regression Analysis
摘 要：Above Ground Biomass is one of the six pools identified in the inventory of forest resources and estimation of greenhouse gas emissions and sinks from the forestry sector. The pool varies by management practices in different agro-ecological or agro-climatic zones in forests. The quantification of above ground biomass (AGB) hence carbon sequestration in forests has been very difficult due to the immense costs required. This research was done to estimate AGB using ALOS PALSAR L band data (HH, HV polarisation) acquired in 2009 in relation with ground measurements data in Kericho and Aberdares ranges in Kenya. Tree data information was obtained from ground measurement of DBH and tree heights in 100 circular plots of 15 m radius, by use of random sampling technique. ALOS PALSAR image is advantageous for its active microwave sensor using L-band frequency to achieve cloud free imageries, and the ability of long wavelength cross-polarization to estimate AGB accurately for tropical forests. The variations result between Natural and plantation forest for measured and estimated biomass in Kericho HV band regression value was 0.880 and HH band was 0.520. In Aberdare ranges HV regression value of 0.708 and HH band regression value of 0.511 for measured and estimated biomass respectively. The variations can be explained by the influence of different management regimes induced human disturbances, forest stand age, density, species composition, and trees diameter distribution. However, further research is required to investigate how strong these factors affect relationship between AGB and Alos Palsar backscatters.
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