Global patterns and climatic drivers of above- and belowground net primary productivity in grasslands
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obal patterns and climatic drivers of above- and belowground net primary productivity in grasslands 1
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Yuanfeng Sun , Yuanhe Yang , Xia Zhao , Zhiyao Tang , Shaopeng Wang & Jingyun Fang 1
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Institute of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of
Education, Peking University, Beijing 100871, China; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China Received October 3, 2020; accepted October 15, 2020; published online November 17, 2020
Understanding patterns and determinants of net primary productivity (NPP) in global grasslands are ongoing challenges, especially for belowground NPP (BNPP) and its fraction (fBNPP). By developing a comprehensive field-based dataset, we revealed that, along with gradients of mean annual precipitation, actual evapotranspiration, and aridity, aboveground NPP (ANPP), BNPP, and total NPP (TNPP) exhibited hump-shaped patterns, whereas fBNPP showed an opposite trend. ANPP and TNPP showed positive correlations with mean annual temperature, but fBNPP was negatively correlated with it. The relationship between BNPP and climatic factors was considerably weak, indicating that BNPP was relatively stable regardless of the climate conditions. We also observed that the sensitivities of ANPP and BNPP to interannual temperature variability and BNPP to interannual precipitation fluctuations exhibited large variations among different study sites, and differed from those at the spatial scale. In contrast, the temporal sensitivities of ANPP to interannual precipitation variability were highly similar across all the individual sites and much smaller than those at the spatial scale. Overall, these results highlight that precipitation, temperature and evapotranspiration all play vital roles in shaping ANPP pattern and its partitioning to belowground and the patterns of BNPP along climatic gradients do not mirror those of the ANPP. net primary productivity, productivity partition, climate change, grasslands, precipitation, temperature Citation:
Sun, Y., Yang, Y., Zhao, X., Tang, Z., Wang, S., and Fang, J. (2020). Global patterns and climatic drivers of above- and belowground net primary productivity in grasslands. Sci China Life Sci 63, https://doi.org/10.1007/s11427-020-1837-9
Grasslands are widespread around the world, covering 31%– 43% of the Earth’s land surface and accounting for 34% of global terrestrial carbon (C) stocks (White et al., 2000). Due to their large C storage and higher sensitivity to climate change, grasslands play crucial roles in global terrestrial C cycle (Ahlström et al., 2015; Nemani et al., 2003; Poulter et al., 2014; Wang et al., 2019a). As a fundamental variable which has been widely utilized to assess C cycling in terrestrial ecosystems (Del Grosso et al., 2008; Field et al., 1998; Morel et al., 2019; Schuur, 2003), net primary productivity (NPP) determines the net C input to terrestrial ecosystems (Mich
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