锦州地区玉米农田生态系统水汽通量变化特征及其调控机制

doi:10.3969/j.issn.1673-503X.2016.06.021

Abstract

Abstract: Based on the observation data of eddy covariance over a rain-fed maize farmland ecosystem in Jinzhou in 2014,the water vapor flux characteristics were analyzed and regulation mechanisms of the vapor flux were determined using the microclimate observational data.The results show that a single-peak curve is presented for diurnal variation of water vapor flux for each month.The daily average water vapor flux during growing season is 10 times as large as that during non-growing season.The maximum value of 30-min averaged water vapor flux appears in July with the value of 0.1202 g·m^-2·s^-1.The annual evapotranspiration of maize farmland in 2014 was 417.37 mm,and the total evapotranspiration during non-growing season was 49.57 mm which slightly higher than the precipitation during the same period.The proportions of evapotranspiration to precipitation in May and June (i.e.,early stage of the growing season) are 52.0% and 71.0%,respectively.The amount of evapotranspiration during July-September is greater than that of rainfall,and in July the evapotranspiration is 3 times as large as precipitation.Because it is the period of corn pollination in July,severe water deficit during this period would affect maize yield.The water vapor flux during the growing season is significantly positively correlated with the net radiation and is controlled by air temperature and saturation vapor pressure difference to some extent.

Key words: Maize field, Water vapor flux, Eddy covariance, Evapotranspiration, Saturation vapor pressure difference, Net radiation

CLC Number:

S162.4

WAN Zhi-hong, LI Rong-ping, ZHOU Guang-sheng, WANG Ying, WANG Wan-zhao, ZHANG Xiao-yue. Variation characteristics and regulation mechanisms of water vapor flux over a rain-fed maize farmland ecosystem in Jinzhou[J]. Journal of Meteorology and Environment, 2016, 32(6): 155-159.

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http://www.jme1984.net.cn/EN/Y2016/V32/I6/155

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Variation characteristics and regulation mechanisms of water vapor flux over a rain-fed maize farmland ecosystem in Jinzhou

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