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  • Title: [Estimation of evapotranspiration and crop coefficient in Dajiuhu peatland of Shennongjia based on FAO56 Penman-Monteith].
    Author: Hu C, Ge JW, Xu XN, Tan YS, Yuan CH.
    Journal: Ying Yong Sheng Tai Xue Bao; 2020 May; 31(5):1699-1706. PubMed ID: 32530249.
    Abstract:
    We collected evapotranspiration data of Dajiuhu peatland in Shennongjia from 2016 to 2017 with eddy covariance method and estimated the value of crop coefficient (Kc) using FAO56 Penman-Monteith equation and the linear relationship between actual evapotranspiration (ETa) and referenced evapotranspiration (ET0). We analyzed the characteristics of referenced evapotranspiration and its main influencing factors and calculated the crop coefficient of the wetland dominated by Sphagnum. The results showed that the daily averaged ETa were 1.63 and 1.38 mm·d-1 in 2016 and 2017, the daily averaged ET0 were 1.61 and 1.23 mm·d-1 in 2016 and 2017. Environmental factors influencing ET0 included net radiation, air temperature, vapor pressure deficit, wind speed, and relative humidity. The Kc values for the growing seasons of 2016, 2017, and 2016-2017 were 0.95 (R2 of linear regression between ETa and ET0 was 0.96), 1.03 (R2=0.95), and 0.98 (R2=0.95). The Kc values in 2016, 2017, and 2016-2017 were 0.92 (R2=0.94), 0.95 (R2=0.89), and 0.93 (R2=0.92). Kc was effective in the range of 0.92-1.03 for the wetland dominated by Sphagnum. The identified parameters could be widely used in studies on climate change, ecosystem services, and water management in peatlands. 利用涡度相关法获取神农架大九湖泥炭湿地2016—2017年的蒸散数据,选用FAO56 Penman-Monteith公式及实际蒸散(ETa)与参考蒸散(ET0)之间的线性关系估算作物系数(Kc)值,分析泥炭湿地参考蒸散变化特征及主要影响因子,并确定以泥炭藓为主的湿地作物系数。结果表明: 2016、2017年研究区日均ETa和ET0值分别为1.63、1.38和1.61、1.23 mm·d-1;影响参考蒸散的环境因子贡献从大到小依次为净辐射、空气温度、饱和水气压差、风速、相对湿度;2016年、2017年和2016—2017年生长季的Kc值分别为0.95(ETa与ET0线性回归的R2=0.96)、1.03(R2=0.95)、0.98(R2=0.95);2016年、2017年和2016—2017年全年的Kc值分别为0.92(R2=0.94)、0.95(R2=0.89)、0.93(R2=0.92),以泥炭藓为主的湿地Kc在0.92~1.03范围内有效。本研究确定的参数能够广泛用于以泥炭藓为主的泥炭湿地气候变化、生态系统服务和水管理等研究。.
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