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Variation of gross primary production, evapotranspiration and water use efficiency for global croplands

Ai, Zhipin, Wang, Qinxue, Yang, Yonghui, Manevski, Kiril, Yi, Shuang, and Zhao, Xin, 2020. Variation of gross primary production, evapotranspiration and water use efficiency for global croplands. Agricultural and Forest Meteorology, 287:107935, doi:10.1016/j.agrformet.2020.107935.

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@ARTICLE{2020AgFM..28707935A,
       author = {{Ai}, Zhipin and {Wang}, Qinxue and {Yang}, Yonghui and {Manevski}, Kiril and {Yi}, Shuang and {Zhao}, Xin},
        title = "{Variation of gross primary production, evapotranspiration and water use efficiency for global croplands}",
      journal = {Agricultural and Forest Meteorology},
     keywords = {Evapotranspiration, Gross primary production, Irrigation, Rainfed, Total water mass storage, Trend analysis},
         year = 2020,
        month = jun,
       volume = {287},
          eid = {107935},
        pages = {107935},
     abstract = "{An improved understanding of the productivity and water use efficiency
        (WUE) of global croplands is essential for coping with the
        growing demand for food and water. At present, the
        spatiotemporal distribution and trends of WUE and the associated
        gross primary production (GPP) and evapotranspiration (ET) for
        croplands remain poorly quantified at the global scale,
        especially considering the differences between rainfed and
        irrigated conditions. In this study, the Moderate Resolution
        Imaging Spectroradiometer (MODIS) products and the newly
        developed Global Food Security-support Analysis Data product of
        Crop Dominance (GFSAD1KCD) were utilized to quantify and analyze
        spatiotemporal variation and annual trends in GPP, ET and WUE
        for global croplands from 2000 to 2014. The analysis was
        complemented with total water storage data from the Gravity
        Recovery and Climate Experiment. The results showed that the
        croplands with the highest GPP had the highest ET. The mean WUE
        of global croplands was 1.73 g C kg$^{-1}$ H$_{2}$O, ranging
        from a lower mean value of 1.62 g C kg$^{-1}$ H$_{2}$O for
        irrigated croplands to a higher mean value of 1.83 g C kg$^{-1}$
        H$_{2}$O for rainfed croplands. Irrigated croplands generally
        had lower WUE than rainfed croplands; this difference decreased
        during 2000-2014 owing to a significantly increasing trend in
        WUE for irrigated cropland and a significantly deceasing trend
        in WUE for rainfed croplands. However, the increase in WUE
        observed for irrigated croplands did not necessarily overlap
        with the decrease in groundwater depletion, as indicated by the
        corresponding and significantly decreasing trend of total water
        storage. The GFSAD1KCD data proved useful for investigating
        primary production and WUE for global croplands, especially in
        comparisons between irrigated and rainfed conditions. Future
        studies should focus on reducing the uncertainty associated with
        the distribution of irrigated croplands in order to better
        quantify and understand WUE on a global scale.}",
          doi = {10.1016/j.agrformet.2020.107935},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2020AgFM..28707935A},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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