干旱区生态环境知识资源中心(Arid): Predicting the Spatial Distribution and Severity of Soil Erosion in the Global Tropics using Satellite Remote Sensing

Arid

DOI	10.3390/rs11151800
	Predicting the Spatial Distribution and Severity of Soil Erosion in the Global Tropics using Satellite Remote Sensing
	Vagen, Tor-Gunnar; Winowiecki, Leigh Ann
通讯作者	Vagen, Tor-Gunnar
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2019
卷号	11 期号:15
英文摘要	Simple Summary This research paper presents the first consistent spatial assessments of soil erosion prevalence based on Earth observation data and systematic field surveys to train models that predict soil erosion prevalence across the global tropics. The results of the study have major implications for efforts to identify land degradation hotspots and design interventions to restore degraded lands given the importance of soil erosion as a major process of land degradation globally. The paper also presents analysis of changes in soil erosion prevalence over the 15 year period from 2002 to 2017. The results of the study can also be used to better understand ecosystem health and resilience in the global tropics, for assessments of food security, and the implications of land degradation on climate change. Abstract Soil erosion has long been recognized as a major process of land degradation globally, affecting millions of hectares of land in the tropics and resulting in losses in productivity and biodiversity, decreased resilience of both marine and terrestrial ecosystems, and increased vulnerability to climate change. This paper presents an assessment of the extent of soil erosion in the global tropics at a moderate spatial resolution (500 m) based on a combination of systematic field surveys using the Land Degradation Surveillance Framework (LDSF) methodology and Earth observation data from the Moderate Resolution Imaging Spectroradiometer (MODIS) platform. The highest erosion prevalence was observed in wooded grassland, bushland, and shrubland systems in semi-arid areas, while the lowest occurrence was observed in forests. Observed erosion decreased with increasing fractional vegetation cover, but with high rates of erosion even at 50-60% fractional cover. These findings indicate that methods to assess soil erosion need to be able to detect erosion under relatively dense vegetation cover. Model performance was good for prediction of erosion based on MODIS, with high accuracy (89% for detection) and high overall precision (AUC = 0.97). The spatial predictions from this study will allow for better targeting of interventions to restore degraded land and are also important for assessing the dynamics of land health indicators such as soil organic carbon. Given the importance of soil erosion for land degradation and that the methodology gives robust results that can be rapidly replicated at scale, we would argue that soil erosion should be included as a key indicator in international conventions such as the United Nations Convention to Combat Desertification.
英文关键词	soil erosion land degradation global tropics food security remote sensing Earth observation ecosystem health resilience
类型	Article
语种	英语
国家	Kenya
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000482442800064
WOS关键词	LAND DEGRADATION ; CLIMATE-CHANGE ; COVER ; IMPACTS ; POLICY ; AREA
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218399
作者单位	World Agroforestry Ctr ICRAF, POB 30677-00100, Nairobi, Kenya
推荐引用方式 GB/T 7714	Vagen, Tor-Gunnar,Winowiecki, Leigh Ann. Predicting the Spatial Distribution and Severity of Soil Erosion in the Global Tropics using Satellite Remote Sensing[J],2019,11(15).
APA	Vagen, Tor-Gunnar,&Winowiecki, Leigh Ann.(2019).Predicting the Spatial Distribution and Severity of Soil Erosion in the Global Tropics using Satellite Remote Sensing.REMOTE SENSING,11(15).
MLA	Vagen, Tor-Gunnar,et al."Predicting the Spatial Distribution and Severity of Soil Erosion in the Global Tropics using Satellite Remote Sensing".REMOTE SENSING 11.15(2019).