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Responses of gross primary productivity to different sizes of precipitation events in a temperate grassland ecosystem in Inner Mongolia, China

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Abstract

Changes in the sizes of precipitation events in the context of global climate change may have profound impacts on ecosystem productivity in arid and semiarid grasslands. However, we still have little knowledge about to what extent grassland productivity will respond to an individual precipitation event. In this study, we quantified the duration, the maximum, and the time-integrated amount of the response of daily gross primary productivity (GPP) to an individual precipitation event and their variations with different sizes of precipitation events in a typical temperate steppe in Inner Mongolia, China. Results showed that the duration of GPP-response (τ R) and the maximum absolute GPP-response (GPPmax) increased linearly with the sizes of precipitation events (P es), driving a corresponding increase in time-integrated amount of the GPP-response (GPPtotal) because variations of GPPtotal were largely explained by τ R and GPPmax. The relative contributions of these two parameters to GPPtotal were strongly P es-dependent. The GPPmax contributed more to the variations of GPPtotal when P es was relatively small (<20 mm), whereas τ R was the main driver to the variations of GPPtotal when P es was relatively large. In addition, a threshold size of at least 5 mm of precipitation was required to induce a GPP-response for the temperate steppe in this study. Our work has important implications for the modeling community to obtain an advanced understanding of productivity-response of grassland ecosystems to altered precipitation regimes.

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Authors and Affiliations

  1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China

    Qun Guo, Shenggong Li, Zhongmin Hu, Wei Zhao, Guirui Yu & Xiaomin Sun

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Wei Zhao

  3. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China

    Linghao Li & Wenming Bai

  4. Global Carbon Cycle Research Section Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, 305-8506, Japan

    Naishen Liang

Authors
  1. Qun Guo
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  2. Shenggong Li
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  3. Zhongmin Hu
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  4. Wei Zhao
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  5. Guirui Yu
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  6. Xiaomin Sun
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  7. Linghao Li
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  8. Naishen Liang
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  9. Wenming Bai
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Correspondence to Zhongmin Hu.

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Guo, Q., Li, S., Hu, Z. et al. Responses of gross primary productivity to different sizes of precipitation events in a temperate grassland ecosystem in Inner Mongolia, China. J. Arid Land 8, 36–46 (2016). https://doi.org/10.1007/s40333-015-0136-7

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  • DOI: https://doi.org/10.1007/s40333-015-0136-7

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