Journal
ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
Volume 81, Issue -, Pages 22-31Publisher
ELSEVIER
DOI: 10.1016/j.actao.2017.04.004
Keywords
Global grassland ecosystems; Carbon use efficiency (CUE); Net primary production (NPP); Gross primary productivity (GPP); Precipitation; Temperature
Categories
Funding
- APN Global Change Fund Project [ARCP2015-03CMY-Li, CAF2015-RR14-NMY-Odeh]
- Jiangsu Province Agricultural Three Renovations Project of China [SXGC [2014]287]
- National Natural Science Foundation of China [41271361]
- Key Project of Chinese National Programs for Fundamental Research and Development (973 Program) [2010CB950702]
- National High Technology Project (863 Plan) [2007AA10Z231]
- Australian Agency for International Development (PSLP) [64828]
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The carbon use efficiency (CUE) of grassland, a ratio of net primary production (NPP) to gross primary productivity (GPP), is an important index representing the capacity of plants to transfer carbon from the atmosphere to terrestrial biomass. In this study, we used the Moderate Resolution Imaging Spectror-adiometer (MODIS) data to calculate the global grassland CUE, and explore the spatiotemporal dynamic of global grassland CUE from 2000 to 2013 to discuss the response to climate variations. The results showed that the average annual CUE of different grassland types follows an order of: open shrublands > non-woody grasslands > closed shrublands > woody savannas > savannas. The higher grassland CUE mainly occurred in the regions with cold and dry climate. By contrast, the regions with the lower grassland CUE were mostly in warm and wet environments. Moreover, the CUE exhibited a globally positive correlation with precipitation and a negative correlation with temperature. Therefore, the grassland CUE has considerable spatial variation associated with grassland type, geographical location and climate change. (C) 2017 Elsevier Masson SAS. All rights reserved.
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