Extreme climatic events down-regulate the grassland biomass response to elevated carbon dioxide.

Benefited from the higher [CO 2 ] in eCO 2 plots, an increasing trend of ES was observed from 2001 to 2008 (see Fig. 3 in 38 ), but the positive effects of elevated [CO 2 ] were still covered especially for the first time section (1998–2005/2006).

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