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Estimation of Terrestrial Net Primary Productivity in the Yellow River Basin of China Using Light Use Efficiency Model

Author

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  • Fengjin Xiao

    (National Climate Center, China Meteorological Administration, 46 Zhonguancun South Avenue, Beijing 100081, China)

  • Qiufeng Liu

    (National Climate Center, China Meteorological Administration, 46 Zhonguancun South Avenue, Beijing 100081, China)

  • Yuqing Xu

    (National Climate Center, China Meteorological Administration, 46 Zhonguancun South Avenue, Beijing 100081, China)

Abstract

The net primary productivity ( NPP ) of vegetation is an essential factor of ecosystem functions, including the biological geochemical carbon cycle, which is often impacted by climate change and human activities. It plays a significant role in comprehending the nature of carbon balance in an ecosystem and demonstrates the global and regional carbon cycle dynamics. The present study used an upgraded CASA model to calculate the NPP in the Yellow River Basin (YRB), China. The model’s simulation ability was improved by changing the model parameters. Further, the CASA model was validated by comparing with MODIS- NPP and in situ observed NPP , wherein the accuracy of the CASA model estimation was found satisfactory to estimate NPP changes in the study area. The simulated results of the improved CASA model showed that the mean annual NPP value of vegetation in the YRB was 283.4 gC m –2 a –1 from 2001 to 2020, with a declining trend in spatial distribution from south to north. In contrast, the NPP appeared as an increasing trend in the YRB temporally from 212 gC m –2 a –1 in 2001 to 342 gC m –2 a –1 in 2020, with a mean annual growth rate of 4.6 gC m –2 a –1 . The total NPP in the YRB increased by 40,088.3 GgC between 2001 and 2020, from 226.06 TgC to 266.15 TgC. This rise can be attributed to the increase in forests. The average grassland area has reduced by 4651 km 2 during the last two decades, significantly impacting the total NPP of grasslands. Although the increase in NPP in wetlands was minimal, accounting for 815.53 GgC, the highest change percentage of 79.78%, could be observed among the six vegetation types due to the anthropogenic influences and climate change. The conditions favorable for vegetation growth and a sustained environment were enhanced by the increased precipitation and temperature and the reinforced ecological protection by the government.

Suggested Citation

  • Fengjin Xiao & Qiufeng Liu & Yuqing Xu, 2022. "Estimation of Terrestrial Net Primary Productivity in the Yellow River Basin of China Using Light Use Efficiency Model," Sustainability, MDPI, vol. 14(12), pages 1-15, June.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:12:p:7399-:d:840745
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    References listed on IDEAS

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    2. Wen Li & Jianwei Geng & Jingling Bao & Wenxiong Lin & Zeyan Wu & Shuisheng Fan, 2023. "Analysis of Spatial and Temporal Variations in Ecosystem Service Functions and Drivers in Anxi County Based on the InVEST Model," Sustainability, MDPI, vol. 15(13), pages 1-16, June.

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