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carbon stock estimation by dual-polarized synthetic aperture radar (SAR) and forest inventory data in a Mediterranean forest landscape

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Journal of Forestry Research 2022年第3期33卷 827-838页

作者： Can Vatandaşlar Saygin Abdikan Department of Forest Engineering Artvin Coruh University08100ArtvinTurkey Department of Geomatics Engineering Hacettepe University06800AnkaraTurkey

Forest ecosystems play a crucial role in mitigating global climate change by forming massive carbon sinks. Their carbon stocks and stock changes need to be quantified for carbon budget balancing and international reporting schemes. However, direct sampling and biomass weighing may not always be possible for quantification studies conducted in large forests. In these cases, indirect methods that use forest inventory information combined with remote sensing data can be beneficial. Synthetic aperture radar (SAR) images offer numerous opportunities to researchers as freely distributed remote sensing data. This study aims to estimate the amount of total carbon stock (TCS) in forested lands of the Kizildag Forest Enterprise. To this end, the actual storage capacities of five carbon pools, i.e. above- and below-ground, deadwood, litter, and soil, were calculated using the indirect method based on ground measurements of 264 forest inventory plots. They were then associated with the backscattered values from Sentinel-1 and ALOS-2 PALSAR-2 data in a Geographical Information System (GIS). Finally, TCS was separately modelled and mapped. The best regression model was developed using the HH polarization of ALOS-2 PALSAR-2 with an adjusted R^(2) of 0.78 (p carbon storage of 133 t ha^(−1). The map showed that the distribution of TCS was heterogenic across the study area. carbon hotspots were mostly composed of pure stands of Anatolian black pine and mixed, over-mature stands of Lebanese cedar and Taurus fir. It was concluded that the total carbon stocks of forest ecosystems could be estimated using appropriate SAR images at acceptable accuracy levels for forestry purposes. The use of additional ancillary data may provide more delicate and reliable estimations in the future. Given the implications of this study, the spatiotemporal dynamics of carbon can be effectively controlled by forest management when coupled with easily a

关键词： carbon storage aboveground carbon Soil-bound carbon Forest biomass Synthetic aperture radar(SAR)

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Biomass and carbon stocks in mangrove ecosystems of Kerala,southwest coast of India

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Ecological Processes 2020年第1期9卷 355-363页

作者： K.M.Harishma S.Sandeep V.B.Sreekumar Department of Forest Botany Kerala Forest Research InstitutePeechiKerala 680653India Department of Soil Science Kerala Forest Research InstitutePeechiKerala 680653India

Background:Mangroves are important tropical carbon sinks,and their role in mitigating climate change is well documented across the globe.However,the ecosystem carbon stocks in the mangroves of India have not been studied comprehensively.Data from this region is very limited for providing sufficient insights and authentic evaluation of carbon stocks on a regional scale.In this study,we evaluated the ecosystem carbon stock and its spatial variation in mangroves of Kerala,southwest coast of India.Results:The mean biomass stored in mangrove vegetation of Kerala is 117.11±1.02 t/ha(ABG=80.22±0.80,BGB=36.89±0.23 t/ha).Six mangrove species were found distributed in the study area.Among the different species,Avicennia marina had the highest biomass(162.18 t/ha)and least biomass was observed in Sonneratia alba(0.61 t/ha).The mean ecosystem carbon stock of mangrove systems in Kerala was estimated to be 139.82 t/ha,equivalent to 513.13 t CO2 e/ha with the vegetation and soil storing 58.56 t C/ha and 81.26 t C/ha respectively.Conclusion:The present study reveals that Kerala mangroves store sizable volume of carbon and therefore need to be preserved and managed sustainably,to retain along with the increase in carbon storage.This features the need of broadening mangrove cover as well as restoring deteriorated land in the past 50 years.Although mangrove forests in this region are protected by the Kerala Forest Department,they have been frequently facing illegal encroachment,prawn cultivation,and coastal erosion.

关键词： Mangrove ecosystem Biomass aboveground carbon Belowground carbon Ecosystem carbon stock

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