Arid
DOI10.1016/j.gloplacha.2012.05.003
Multi-pronged assessment of land degradation in West Africa to assess the importance of atmospheric fertilization in masking the processes involved
Le, Quang Bao1,2; Tamene, Lulseged2,3; Vlek, Paul L. G.2
通讯作者Le, Quang Bao
来源期刊GLOBAL AND PLANETARY CHANGE
ISSN0921-8181
出版年2012
卷号92-93页码:71-81
英文摘要

Separating human-induced land degradation from that caused by natural processes in the world of global climate and atmospheric change is a challenging task, but important for developing mitigation strategies. Current remote-sensing data and spatio-temporal analyses allow the distinction of climate and human-induced land degradation on a sub-continental scale, but the underlying processes cannot be discerned at this scale. This study is conducted at a river-basin scale to (1) identify land degradation hotspots in a basin or sub-basin, and (2) assess the correspondence and divergence of land degradation assessed by NDVI shifts with and without accounting for atmospheric fertilization with that based on soil erosion assessment at a sub-basin scale. Long-term remote sensing (NDVI) and rainfall data were used to identify human-induced land degradation hotspot areas in the Volta basin. The results were compared with the critical zone of soil loss in the White Volta sub-basin derived from a spatially distributed soil erosion model, validated by field-measured data. A spatial comparison of the above studies revealed that the biomass productivity (NDVI)-based land degradation assessment grossly underestimated the extent to which soil is being lost, unless a correction was included to account for atmospheric fertilization. Based on inter-annual NDVI signals land degradation was evident in about 8% of the Volta basin’s landmass, but when accounting for atmospheric fertilization, as much as 65% of the land is losing some of its vital attributes such as soil quality or vegetation productivity. The study demonstrates the need for using a multi-pronged assessment strategy in land degradation assessment that offers an insight of the processes involved in land degradation. (C) 2012 Elsevier B.V. All rights reserved.


英文关键词NDVI long-term biomass productivity trend land degradation soil erosion multi-scale approach Volta basin West Africa
类型Article
语种英语
国家Switzerland ; Germany ; Malawi
收录类别SCI-E
WOS记录号WOS:000307031000008
WOS关键词SUB-SAHARAN AFRICA ; PROXY GLOBAL ASSESSMENT ; SOIL-EROSION ; R-FACTOR ; DESERTIFICATION ; CLIMATE ; VEGETATION ; TRENDS ; BASIN ; DEPOSITION
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172635
作者单位1.ETH, NSSI, IED, CH-8092 Zurich, Switzerland;
2.Univ Bonn, Ctr Dev Res ZEF, D-53113 Bonn, Germany;
3.Ctr Int Agr Trop, Chitedze Agr Res Stn, Lilongwe, Malawi
推荐引用方式
GB/T 7714
Le, Quang Bao,Tamene, Lulseged,Vlek, Paul L. G.. Multi-pronged assessment of land degradation in West Africa to assess the importance of atmospheric fertilization in masking the processes involved[J],2012,92-93:71-81.
APA Le, Quang Bao,Tamene, Lulseged,&Vlek, Paul L. G..(2012).Multi-pronged assessment of land degradation in West Africa to assess the importance of atmospheric fertilization in masking the processes involved.GLOBAL AND PLANETARY CHANGE,92-93,71-81.
MLA Le, Quang Bao,et al."Multi-pronged assessment of land degradation in West Africa to assess the importance of atmospheric fertilization in masking the processes involved".GLOBAL AND PLANETARY CHANGE 92-93(2012):71-81.
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