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Performance of the Remotely-Derived Products in Monitoring Gross Primary Production across Arid and Semi-Arid Ecosystems in Northwest China

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  • Qing Gu

    (Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China
    Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China)

  • Hui Zheng

    (Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Henan University, Kaifeng 475004, China)

  • Li Yao

    (Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China
    Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Henan University, Kaifeng 475004, China)

  • Min Wang

    (Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China)

  • Mingguo Ma

    (Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China)

  • Xufeng Wang

    (Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

  • Xuguang Tang

    (Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China
    Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China)

Abstract

As an important component to quantify the carbon budget, accurate evaluation of terrestrial gross primary production (GPP) is crucial for large-scale applications, especially in dryland ecosystems. Based on the in situ data from six flux sites in northwestern China from 2014 to 2016, this study compares seasonal and interannual dynamics of carbon fluxes between these arid and semi-arid ecosystems and the atmosphere. Meanwhile, the reliability of multiple remotely-derived GPP products in representative drylands was examined, including the Breathing Earth System Simulator (BESS), the Moderate Resolution Imaging Spectroradiometer (MODIS) and data derived from the OCO-2 solar-induced chlorophyll fluorescence (GOSIF). The results indicated that the carbon fluxes had clear seasonal patterns, with all ecosystems functioning as carbon sinks. The maize cropland had the highest GPP with 1183 g C m −2 y −1 . Although the net ecosystem carbon exchange (NEE) in the Tamarix spp. ecosystem was the smallest among these flux sites, it reached 208 g C m −2 y −1 . Furthermore, distinct advantages of GOSIF GPP (with R 2 = 0.85–0.98, and RMSE = 0.87–2.66 g C m −2 d −1 ) were found with good performance. However, large underestimations in three GPP products existed during the growing seasons, except in grassland ecosystems. The main reasons can be ascribed to the uncertainties in the key model parameters, including the underestimated light use efficiency of the MODIS GPP, the same coarse land cover product for the BESS and MODIS GPP, the coarse gridded meteorological data, and distribution of C 3 and C 4 plants. Therefore, it still requires more work to accurately quantify the GPP across these dryland ecosystems.

Suggested Citation

  • Qing Gu & Hui Zheng & Li Yao & Min Wang & Mingguo Ma & Xufeng Wang & Xuguang Tang, 2020. "Performance of the Remotely-Derived Products in Monitoring Gross Primary Production across Arid and Semi-Arid Ecosystems in Northwest China," Land, MDPI, vol. 9(9), pages 1-16, August.
  • Handle: RePEc:gam:jlands:v:9:y:2020:i:9:p:288-:d:402700
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    References listed on IDEAS

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    2. Kevin E. Trenberth & Aiguo Dai & Gerard van der Schrier & Philip D. Jones & Jonathan Barichivich & Keith R. Briffa & Justin Sheffield, 2014. "Global warming and changes in drought," Nature Climate Change, Nature, vol. 4(1), pages 17-22, January.
    3. Wang, Tongxin & Tang, Xuguang & Zheng, Chen & Gu, Qing & Wei, Jin & Ma, Mingguo, 2018. "Differences in ecosystem water-use efficiency among the typical croplands," Agricultural Water Management, Elsevier, vol. 209(C), pages 142-150.
    4. Benjamin Poulter & David Frank & Philippe Ciais & Ranga B. Myneni & Niels Andela & Jian Bi & Gregoire Broquet & Josep G. Canadell & Frederic Chevallier & Yi Y. Liu & Steven W. Running & Stephen Sitch , 2014. "Contribution of semi-arid ecosystems to interannual variability of the global carbon cycle," Nature, Nature, vol. 509(7502), pages 600-603, May.
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    Cited by:

    1. Zhichao Xue & Martin Kappas & Daniel Wyss, 2021. "Spatio-Temporal Grassland Development in Inner Mongolia after Implementation of the First Comprehensive Nation-Wide Grassland Conservation Program," Land, MDPI, vol. 10(1), pages 1-16, January.

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