Effects of Precipitation Intensity and Temperature on NDVI-Based Grass Change over Northern China during the Period from 1982 to 2011Reportar como inadecuado




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1

State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 831001, China

2

School of Life Sciences, University of Technology Sydney, Sydney 2000, Australia

3

Graduate School, University of Chinese Academy of Sciences, Beijing 100100, China





*

Author to whom correspondence should be addressed.



Academic Editors: Clement Atzberger and Prasad S. Thenkabail

Abstract The knowledge about impacts of changes in precipitation regimes on terrestrial ecosystems is fundamental to improve our understanding of global environment change, particularly in the context that heavy precipitation is expected to increase according to the 5th Intergovernmental Panel on Climate Change IPCC assessment. Based on observed climate data and the Advanced Very High Resolution Radiometer AVHRR Global Inventory Modeling and Mapping Studies GIMMS satellite-derived normalized difference vegetation index NDVI, here we analyzed the spatio-temporal changes in grassland NDVI, covering 1.64 × 106 km2, in northern China and their linkages to changes in precipitation and temperature during the period 1982–2011. We found that mean growing season April–October grass NDVI is more sensitive to heavy precipitation than to moderate or light precipitation in both relatively arid areas RAA and relatively humid areas RHA, whereas the sensitivities of grass NDVI to temperature are comparable to total precipitation in RHA. Heavy precipitation showed the strongest impacts in more than half of northern China 56%, whereas impacts of light precipitation on grass NDVI were stronger in some areas 21%, mainly distributed in northwestern China, a typical arid and semi-arid area. Our findings suggest that responses of grasslands are divergent with respect to changes in precipitation intensities. View Full-Text

Keywords: climate change; GIMMS; NDVI; precipitation intensity climate change; GIMMS; NDVI; precipitation intensity





Autor: Xiuliang Yuan 1,3, Longhui Li 2,* , Xi Chen 1 and Hao Shi 2

Fuente: http://mdpi.com/



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