Preliminary Study on Evapotranspiration of Winter Wheat and Summer Maize Cropping System

doi:10.7668/hbnxb.2014.02.041

Abstract

Abstract: A large-scale weighting lysimeter has been used for systematically exploring annual variation, period- ic variation and daily variation of field evapotranspiration of winter wheat-summer maize cropping system. The rela- tionship between evapotranspiration and the net radiation and other meteorological factors has been investigated by regression analysis. The results showed that, annual evapotranspiration distributed asymmetrically in four seasons and shaped M annually. Spring, summer, autumn, winter accounted for 44%,32%,17%,7%, respectively. Evapotrans- piration peaked at jointing stage to heading stage of winter wheat and jointing stage to tasseling stage of summer maize. Those were water critical period of crop growth and supplementary irrigation critical periods. Daily evapo- transpiration showed parabolic trends. Solar net radiation, air temperature and rainfall influenced evapotranspiration and followed by the same order as above, and solar net radiation and air temperature significantly affected evapo- transpiration.

Key words: Winter wheat, Summer maize, Weighting lysimeter, Evapotranspiration, Variation regularity

CLC Number:

S314

WANG Tong-chao, LI Xiao-yan, LI Qian, WANG He-zhou, GUAN Xiao-kang. Preliminary Study on Evapotranspiration of Winter Wheat and Summer Maize Cropping System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(2): 218-222. doi: 10.7668/hbnxb.2014.02.041.

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