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

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

Agricultural Water Management, 2018, vol. 208, issue C, 454-464

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.

Keywords: ET-VPD hysteresis; Ventilated chamber; Karst landscapes; Environmental factors; Eco-hydrology; Earth’s critical zone (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:208:y:2018:i:c:p:454-464

DOI: 10.1016/j.agwat.2018.06.007

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