Proxy Global Assessment of Land Degradation.
Abstract Land degradation is always with us but its causes, extent and severity are contested. We define land degradation as a long-term decline in ecosystem function and productivity, which may be assessed using long-term, remotely sensed normalized difference vegetation index (NDVI) data. Deviatio...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1050.1049 2023-05-15T18:30:49+02:00 Proxy Global Assessment of Land Degradation. Z G Bai D L Dent L Olsson M E Schaepman The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.1049 http://www.geo.uzh.ch/microsite/rsl-documents/research/publications/peer-reviewed-articles/2008_ProxyGlobal_SoilUseMgmt_ZB-0471031552/2008_ProxyGlobal_SoilUseMgmt_ZB.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.1049 http://www.geo.uzh.ch/microsite/rsl-documents/research/publications/peer-reviewed-articles/2008_ProxyGlobal_SoilUseMgmt_ZB-0471031552/2008_ProxyGlobal_SoilUseMgmt_ZB.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geo.uzh.ch/microsite/rsl-documents/research/publications/peer-reviewed-articles/2008_ProxyGlobal_SoilUseMgmt_ZB-0471031552/2008_ProxyGlobal_SoilUseMgmt_ZB.pdf text 2008 ftciteseerx 2020-04-05T00:27:25Z Abstract Land degradation is always with us but its causes, extent and severity are contested. We define land degradation as a long-term decline in ecosystem function and productivity, which may be assessed using long-term, remotely sensed normalized difference vegetation index (NDVI) data. Deviation from the norm may serve as a proxy assessment of land degradation and improvement -if other factors that may be responsible are taken into account. These other factors include rainfall effects which may be assessed by rain-use efficiency, calculated from NDVI and rainfall. Results from the analysis of the 23-year Global Inventory Modeling and Mapping Studies (GIMMS) NDVI data indicate declining rain-use efficiency-adjusted NDVI on ca. 24% of the global land area with degrading areas mainly in Africa south of the equator, South-East Asia and south China, north-central Australia, the Pampas and swaths of the Siberian and north American taiga; 1.5 billion people live in these areas. The results are very different from previous assessments which compounded what is happening now with historical land degradation. Economic appraisal can be undertaken when land degradation is expressed in terms of net primary productivity and the resultant data allow statistical comparison with other variables to reveal possible drivers. Text taiga Unknown |
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Abstract Land degradation is always with us but its causes, extent and severity are contested. We define land degradation as a long-term decline in ecosystem function and productivity, which may be assessed using long-term, remotely sensed normalized difference vegetation index (NDVI) data. Deviation from the norm may serve as a proxy assessment of land degradation and improvement -if other factors that may be responsible are taken into account. These other factors include rainfall effects which may be assessed by rain-use efficiency, calculated from NDVI and rainfall. Results from the analysis of the 23-year Global Inventory Modeling and Mapping Studies (GIMMS) NDVI data indicate declining rain-use efficiency-adjusted NDVI on ca. 24% of the global land area with degrading areas mainly in Africa south of the equator, South-East Asia and south China, north-central Australia, the Pampas and swaths of the Siberian and north American taiga; 1.5 billion people live in these areas. The results are very different from previous assessments which compounded what is happening now with historical land degradation. Economic appraisal can be undertaken when land degradation is expressed in terms of net primary productivity and the resultant data allow statistical comparison with other variables to reveal possible drivers. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Z G Bai D L Dent L Olsson M E Schaepman |
spellingShingle |
Z G Bai D L Dent L Olsson M E Schaepman Proxy Global Assessment of Land Degradation. |
author_facet |
Z G Bai D L Dent L Olsson M E Schaepman |
author_sort |
Z G Bai |
title |
Proxy Global Assessment of Land Degradation. |
title_short |
Proxy Global Assessment of Land Degradation. |
title_full |
Proxy Global Assessment of Land Degradation. |
title_fullStr |
Proxy Global Assessment of Land Degradation. |
title_full_unstemmed |
Proxy Global Assessment of Land Degradation. |
title_sort |
proxy global assessment of land degradation. |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.1049 http://www.geo.uzh.ch/microsite/rsl-documents/research/publications/peer-reviewed-articles/2008_ProxyGlobal_SoilUseMgmt_ZB-0471031552/2008_ProxyGlobal_SoilUseMgmt_ZB.pdf |
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taiga |
genre_facet |
taiga |
op_source |
http://www.geo.uzh.ch/microsite/rsl-documents/research/publications/peer-reviewed-articles/2008_ProxyGlobal_SoilUseMgmt_ZB-0471031552/2008_ProxyGlobal_SoilUseMgmt_ZB.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.1049 http://www.geo.uzh.ch/microsite/rsl-documents/research/publications/peer-reviewed-articles/2008_ProxyGlobal_SoilUseMgmt_ZB-0471031552/2008_ProxyGlobal_SoilUseMgmt_ZB.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766214417456824320 |