A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain

Wang Fangfang; Ma Donghao; Zhao Wenju; Lu Yunxuan; Zhou Ding; Zhang Jiabao; Chen Lin; Huang Ping

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A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain

机译：依据北方平原不同时间尺度作物蒸散量的涡旋协方差技术

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Accurate determination of evapotranspiration (ET) has tremendous potential in guiding irrigation and improving the efficiency of water resources utilization in the North China Plain. Eddy covariance (EC) method is currently a popular method for determining field-scale ET. However, due to varying foot print and unclosed energy balance, the applicability of EC in different regions needs to be tested and corrected. In present work, we compared the ET of the winter wheat - summer maize rotation cropland measured by the EC method with the ET measured by large-scale lysimeters on different time scales. The degree of energy balance closure of EC measurements in this region is 78%. After adjusted by using Bowen ratio forced closure method, the ET monitored by EC is comparable with those monitored by large-scale lysimeters. The results also indicated that the consistency of the observed ET by the EC and lysimeters got better with an increasing time scale, especially for the multi-year average ET values with a relative deviation of less than 1%. The short-time events such as irrigation and precipitation and the mismatch of the varying footprint area of the EC and the small fixed source area of the lysimeter should be responsible for the discrepancy of ET in two methods on daily scale. However, the factors of crop biomass, total available water, and local climate condition exert more effects on the observed ET on large time scale. Overall, the EC technique is responsible for ET measurement of winter wheat - summer maize rotation cropland of the North China Plain.

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来源
《Canadian Journal of Soil Science》 |2021年第1期|共13页
作者
Wang Fangfang; Ma Donghao; Zhao Wenju; Lu Yunxuan; Zhou Ding; Zhang Jiabao; Chen Lin; Huang Ping;
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作者单位

Chinese Acad Sci Inst Soil Sci State Key Lab Soil &

Sustainable Agr State Expt Stn Agroecosyst Fengqiu Nanjing 210008 Peoples R China;

Chinese Acad Sci Inst Soil Sci State Key Lab Soil &

Sustainable Agr State Expt Stn Agroecosyst Fengqiu Nanjing 210008 Peoples R China;

Hydrol &

Water Resources Survey Bur Xinxiang 453000 Henan Peoples R China;

Chinese Acad Sci Inst Soil Sci State Key Lab Soil &

Sustainable Agr State Expt Stn Agroecosyst Fengqiu Nanjing 210008 Peoples R China;

Chinese Acad Sci Inst Soil Sci State Key Lab Soil &

Sustainable Agr State Expt Stn Agroecosyst Fengqiu Nanjing 210008 Peoples R China;

Chinese Acad Sci Inst Soil Sci State Key Lab Soil &

Sustainable Agr State Expt Stn Agroecosyst Fengqiu Nanjing 210008 Peoples R China;

Chinese Acad Sci Inst Soil Sci State Key Lab Soil &

Sustainable Agr State Expt Stn Agroecosyst Fengqiu Nanjing 210008 Peoples R China;

Chinese Acad Sci Chongqing Inst Green &

Intelligent Technol Key Lab Reservoir Aquat Environm Chongqing 400714 Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类土壤学;
关键词
energy balance; flux measurement; wheat (winter); maize (summer); field-scale measurement;

机译：能量平衡;助焊剂测量;小麦（冬季）;玉米（夏季）;现场规模测量;

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A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain

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