气候变化领域集成服务门户(CCPortal): Widespread subsidence and carbon emissions across Southeast Asian peatlands

CCPortal

DOI	10.1038/s41561-020-0575-4
	Widespread subsidence and carbon emissions across Southeast Asian peatlands
	Hoyt A.M.; Chaussard E.; Seppalainen S.S.; Harvey C.F.
发表日期	2020
ISSN	17520894
起始页码	435
结束页码	440
卷号	13 期号:6
英文摘要	Over the last three decades, most of the 25 million hectares of tropical peatlands in Southeast Asia have been deforested and drained. As a consequence, declining water tables are exposing peat to oxidation, converting plant material accumulated over millennia to carbon dioxide, and causing land subsidence. Here, we quantify the widespread peat carbon loss by using InSAR remote sensing to map subsidence at 90-m resolution across 2.7 Mha of peatland area from 2007 to 2011. Over 90% of the surveyed area is subsiding, with a mean rate of 2.2 cm yr−1. Consequently, the region now faces loss of productive land and flooding because many peatlands are near sea level. Our measurements reveal that smallholder agricultural areas and degraded peatlands are subsiding at rates comparable to those of plantations, and that subsidence rates increase away from rivers and decrease over time following drainage. Because of its detailed spatial resolution, InSAR provides a valuable tool to identify emissions by land use and geography and to target hotspots for better management. Finally, we use remotely sensed maps to update IPCC emissions factors and calculate regional CO2 emissions from peat oxidation of 155 ± 30 MtC yr−1 in 2015, similar in magnitude to both regional fossil-fuel emissions and peat fires. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	carbon emission; Intergovernmental Panel on Climate Change; peatland; remote sensing; spatial resolution; subsidence; synthetic aperture radar; water table; Southeast Asia
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206791
作者单位	Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Center for Environmental Sensing and Modeling, Singapore–MIT Alliance for Research and Technology, Singapore, Singapore; Max Planck Institute for Biogeochemistry, Jena, Germany
推荐引用方式 GB/T 7714	Hoyt A.M.,Chaussard E.,Seppalainen S.S.,et al. Widespread subsidence and carbon emissions across Southeast Asian peatlands[J],2020,13(6).
APA	Hoyt A.M.,Chaussard E.,Seppalainen S.S.,&Harvey C.F..(2020).Widespread subsidence and carbon emissions across Southeast Asian peatlands.Nature Geoscience,13(6).
MLA	Hoyt A.M.,et al."Widespread subsidence and carbon emissions across Southeast Asian peatlands".Nature Geoscience 13.6(2020).