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Comparing ET-VPD hysteresis in three agroforestry ecosystems in a subtropical humid karst area

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  • Zhang, Rongfei
  • Xu, Xianli
  • Liu, Meixian
  • Zhang, Yaohua
  • Xu, Chaohao
  • Yi, Ruzhou
  • Luo, Wei

Abstract

Understanding evapotranspiration–vapor pressure deficit (ET-VPD) hysteresis for different ecosystems can improve our knowledge of vegetation adaptability to a changing environment. However, no previous studies have compared the controlling factors of ET-VPD hysteresis for different agroforestry ecosystems in karst landscapes. Therefore, this study explored ET-VPD hysteresis patterns and the controlling factors for three agroforestry ecosystems, using field observations in a subtropical humid karst catchment from March 12, 2015 to May 26, 2016. The results showed both similarities and differences in ET-VPD hysteresis among the three ecosystems. For example, all three agroforestry ecosystems exhibited noticeable ET-VPD hysteresis, and the hysteric magnitude showed noticeable seasonality with higher values during the growing season. For all three ecosystems, the ET-VPD hysteretic magnitude had no significant relationship with the daily mean environmental factors (e.g. meteorological factors and soil moisture (θ)), but it was highly (R2 > 0.59) correlated to changing rates of meteorological factors (e.g. temperature (Ta), relative humidity (RH), and vapor pressure deficit (VPD)) in the morning. The ET-VPD hysteretic magnitude of the forest–grass mixed ecosystem (142.48 ± 74.16 min) was significantly higher than that of the grass ecosystem (104.37 ± 82.93 min). Hysteresis reflected the extent of imbalance between water demand and water supply for ecosystems during a day. Therefore, this study may be helpful in modeling ET and further understanding ecosystem responses to environmental change.

Suggested Citation

  • Zhang, Rongfei & Xu, Xianli & Liu, Meixian & Zhang, Yaohua & Xu, Chaohao & Yi, Ruzhou & Luo, Wei, 2018. "Comparing ET-VPD hysteresis in three agroforestry ecosystems in a subtropical humid karst area," Agricultural Water Management, Elsevier, vol. 208(C), pages 454-464.
    • Handle: RePEc:eee:agiwat:v:208:y:2018:i:c:p:454-464
    DOI: 10.1016/j.agwat.2018.06.007
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    References listed on IDEAS

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