Chinese Journal of Agrometeorology ›› 2016, Vol. 37 ›› Issue (04): 400-407.doi: 10.3969/j.issn.1000-6362.2016.04.003

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Dynamic Change of Evapotranspiration and Influenced Factors in the Spring Maize Field in Northeast China

GUO Chun-ming, REN Jing-quan, ZHANG Tie-lin, YU Hai   

  1. 1.Institute of Meteorological Science of Jilin Province, Changchun 130062, China;2.Yushu Agrometeorological Station of Jilin Province, Yushu 130400
  • Received:2015-11-24 Online:2016-08-20 Published:2016-08-10

Abstract:

Using the observed data of large-scale weighing lysimeter, the distribution characteristics and influenced factors of evapotranspiration(ETc) in the spring maize field were analyzed. The results showed that the total ETc was 362.3mm and the mean diurnal evapotranspiration was 2.6mm·d-1 during the whole growth period. From the distribution of the growth period, ETc was low during the sowing to seven leaves stage, which the mean diurnal evapotranspiration was 1.4mm·d-1 and accounted for 11.7% of the whole growth period. It rose rapidly since the seven leaves stage, reached the maximum from big flare to heading stage(4.3mm·d-1). The ETc from heading to milk maturity was 97.2mm and the percentage was 26.8% of the whole growth period. From the distribution of the month, the ETc from July to August was 207.0mm which accounted for 54.5% from May to September, but the ETc of May, June and September were low, and the percentage was 11.6%, 19.6% and 14.3%, respectively. From hourly change of the evapotranspiration, it could be graphed as a line with a single-peak which occurred around noon with lower evapotranspiration observed in the morning and evening. The ETc increased significant linearly with increases in leaf area index, solar radiation, 5cm soil temperature, mean air temperature, maximum air temperature and minimum air temperature, while it responded to changes in relative humidity and vapor deficit in a quadratic curve manner with a pattern of first increased and then decreased. Leaf area index was the major biological factors and the 5cm soil temperature and solar radiation were the major environmental factors for evapotranspiration.

Key words: Spring maize, Evapotranspiration, FAO, Large-scale weighing lysimeter, Northeast China