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Inter-annual Variation in Grassland Net Ecosystem Productivity and Its Coupling Relation to Climatic Factors in China

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Remote Sensing Monitoring and Evaluation of Degraded Grassland in China

Part of the book series: Springer Geography ((SPRINGERGEOGR))

Abstract

Grassland carbon (C) sink/source evaluation is important to terrestrial ecosystem C cycling research. In this paper, boreal ecosystem productivity simulator (BEPS), comprising meteorological data, leaf area index, and land-cover-type data, was used to simulate the grassland NEP of China from 1979 to 2008. Regions with NEP of >0 (C sink) accounted for 73.1% of the total grassland area of China. The total C sequestration reached 26.6 TgC yearly, and grassland NEP was positive from 1979 to 2008. The annual changing characteristics were also analyzed. Grassland NEP was positive with carbon sink from June to September, which was negative with carbon source in the remaining months. The carbon conversion efficiency and water-use efficiency of the grassland increased significantly within 30 years. NEP showed positive correlation with precipitation (accounting for 74.2% of the total grassland area was positively correlated) but weakly positive correlation with temperature (50.2% of the case). Furthermore, significant positive correlation was found between grassland NEP and precipitation, especially in northeastern and central Inner Mongolia, and northern Tianshan of Xinjiang, southwestern Tibet, and southern Qinghai Lake. Furthermore, we defined a precipitation differential (PD) parameter to explore the coupling relation between grassland NEP and precipitation. Generally, areas with positive PD are typically a C sinks (72% of the grassland area of IM). However, regions with negative PD are likely a C source (28% of case). Further analysis showed that 69% of regions have positive PD and positive NEP, and 20% of regions have negative PD and negative NEP. This result confirmed that precipitation deficit restrains C sequestration. However, the rest of 11% of regions was sensitive area of carbon sink and carbon source transition. Among 8% of the regions (with negative PD but positive NEP) have insufficient precipitation, although other conditions (i.e., ecological restoration program) are favorable to C sink. Moreover, 3% of the regions (with positive PD but negative NEP) have sufficient precipitation, but have negative NEP because of inappropriate management or low temperature. Thus, appropriate measures that can convert a C source to a C sink are necessary. This paper can serve as a reference for policymakers for the efficient targeted implementation of ecological engineering.

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Authors and Affiliations

  1. Department of Geographic Information and Land Resources, Chongqing Jiaotong University, Chongqing, China

    Wei Zhou

  2. School of Geographical Sciences, Southwest University, Chongqing, China

    Wei Zhou

  3. School of Life Science, Nanjing University, Nanjing, China

    Jianlong Li

  4. Institute of Geographic Sciences and Natural Resources Research (IGSNRR), Chinese Academy of Sciences, Beijing, China

    Tianxiang Yue

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  1. Wei Zhou
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  2. Jianlong Li
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Correspondence to Wei Zhou .

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Zhou, W., Li, J., Yue, T. (2020). Inter-annual Variation in Grassland Net Ecosystem Productivity and Its Coupling Relation to Climatic Factors in China. In: Remote Sensing Monitoring and Evaluation of Degraded Grassland in China. Springer Geography. Springer, Singapore. https://doi.org/10.1007/978-981-32-9382-3_4

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