Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0921-8181 |
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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