Evapotranspiration of Maize Field in Irrigation Area in Heihe Middle Reaches Using the Penman-Monteith Method

doi:10.7668/hbnxb.2015.S1.025

Abstract

Abstract: To study the evapotranspiration (ET) of maize field in irrigation area in Heihe Middle Resches,an ecological experimental station of eco-hydrology research on maize field was established in Zhangye Oasis in irrigation in Heihe Middle Reaches.The meteorological data provided by this station were used to calculate evapotranspiration by the Penman-Monteith equation (P-M).Compared to ET measured by eddy covariance system (EC),It draw a conclusion that two results had a good linear correlation in the whole growing period and that the Penman-Monteith method could response farmland quantity of actual evapotranspiration accurately.Results gotten from P-M showed that the diurnal variation of ET in this agroecosystem could be graphed as a line with a single-peak which occurred high in the noon and low in the morning and evening as following the growing stage;while ET declined slightly and a plateau in the evapotranspiration occurred during the middle part in the day affected by local climate. Seasonal ET highest peaks in bell-mouthed stage (0.39 mm/h) and lowest peaks in maturity period (0.19 mm/h). ET changed as the seasons changed obviously and it was closely related to irrigation,precipitation seasonal distribution and maize leaf area index.The solar radiation,air temperature,relative humidity and wind speed affected the ET together.In May,ET maintained a lower level with the percentage of total ET of 5.0%.In June,ET increased sharply and then up to the maximal value in July and maintains the higher level the whole August.It accounted for 82.0% of the total during June to August.ET decreased rapidly in September,accounted for only 13.0% of the total evapotranspiration in maize growth season.

Key words: Evapotranspiration, Penman-monteith method, Eddy covariance, Irrigation area in Heihe Middle Reaches

CLC Number:

YOU De-bao, WANG Jian-lin, LÜ Ming-qiang, QI Hua. Evapotranspiration of Maize Field in Irrigation Area in Heihe Middle Reaches Using the Penman-Monteith Method[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(S1): 139-145. doi: 10.7668/hbnxb.2015.S1.025.

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