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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.12365
|2 doi
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|a pubmed25n0767.xml
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|a (DE-627)NLM230226132
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|a (NLM)23966315
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Hilker, Thomas
|e verfasserin
|4 aut
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| 245 |
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|a Satellite observed widespread decline in Mongolian grasslands largely due to overgrazing
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 10.09.2014
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|a Date Revised 08.01.2014
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2013 John Wiley & Sons Ltd.
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|a The Mongolian Steppe is one of the largest remaining grassland ecosystems. Recent studies have reported widespread decline of vegetation across the steppe and about 70% of this ecosystem is now considered degraded. Among the scientific community there has been an active debate about whether the observed degradation is related to climate, or over-grazing, or both. Here, we employ a new atmospheric correction and cloud screening algorithm (MAIAC) to investigate trends in satellite observed vegetation phenology. We relate these trends to changes in climate and domestic animal populations. A series of harmonic functions is fitted to Moderate Resolution Imaging Spectroradiometer (MODIS) observed phenological curves to quantify seasonal and inter-annual changes in vegetation. Our results show a widespread decline (of about 12% on average) in MODIS observed normalized difference vegetation index (NDVI) across the country but particularly in the transition zone between grassland and the Gobi desert, where recent decline was as much as 40% below the 2002 mean NDVI. While we found considerable regional differences in the causes of landscape degradation, about 80% of the decline in NDVI could be attributed to increase in livestock. Changes in precipitation were able to explain about 30% of degradation across the country as a whole but up to 50% in areas with denser vegetation cover (P < 0.05). Temperature changes, while significant, played only a minor role (r(2) = 0.10, P < 0.05). Our results suggest that the cumulative effect of overgrazing is a primary contributor to the degradation of the Mongolian steppe and is at least partially responsible for desertification reported in previous studies
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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4 |
|a MAIAC
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4 |
|a MODIS
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4 |
|a Mongolia
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4 |
|a NDVI
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4 |
|a grassland decline
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4 |
|a over-grazing
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4 |
|a time-series
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| 700 |
1 |
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|a Natsagdorj, Enkhjargal
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Waring, Richard H
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lyapustin, Alexei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Yujie
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 20(2014), 2 vom: 21. Feb., Seite 418-28
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
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|g volume:20
|g year:2014
|g number:2
|g day:21
|g month:02
|g pages:418-28
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|u http://dx.doi.org/10.1111/gcb.12365
|3 Volltext
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