排灌机械工程学报
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排灌机械工程学报  2018, Vol. 36 Issue (11): 1081-1086    DOI: 10.3969/j.issn.1674-8530.18.1225
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河套灌区玉米农田蒸散动态变化及其影响因子的通径分析
刘美含, 史海滨*, 李仙岳, 闫建文, 孙伟, 窦旭
内蒙古农业大学水利与土木建筑工程学院, 内蒙古 呼和浩特 010018
Dynamic variation of evapotranspiration of maize field in Hetao Irrigation District and path analysis of affecting factors
LIU Meihan, SHI Haibin*, LI Xianyue, YAN Jianwen, SUN Wei, DOU Xu
Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China
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摘要 采用大型称重式蒸渗仪研究了内蒙古河套灌区玉米蒸散动态规律,并运用通径分析法探讨了玉米蒸散量ET与各影响因子间的相关关系.结果表明:充分灌溉处理下玉米生育期(播前-收获)累积蒸散量为593.72 mm,亏缺灌溉处理下为395.21 mm,日平均蒸散量分别为4.24和2.82 mm/d.由各生育期的分布情况可知苗期蒸散量最小,分别占全生育期的3.7%和5.8%;拔节期开始,蒸散量逐渐增大,在抽雄期达到峰值,2种处理总蒸散量分别为279.38和166.76 mm,日平均蒸散量分别为8.47和5.05 mm/d,分别占整个生育期蒸散总量的47.1%和42.2%.由小时尺度蒸散量变化规律可知,玉米日蒸散量变化规律表现为早晚低、中午高的“单峰型”曲线特征.通径分析表明:2种灌溉处理下,饱和水气压和平均气温对ET的综合决定能力较大,是2个主要的环境驱动因子;2种灌溉处理下对蒸散作用最小的因子均为风速,且风速对ET的影响以间接作用为主.影响河套灌区玉米蒸散的主要气象因子为饱和水气压与气温.
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刘美含
史海滨*
李仙岳
闫建文
孙伟
窦旭
关键词玉米   蒸散量   河套灌区   蒸渗仪   通径分析     
Abstract: The dynamic distribution characteristics of evapotranspiration(ET)of maize in the Hetao Irrigation District were clarified by using a large-scale weighing lysimeter, the correlations between ET and each influencing factor were explored with path analysis method. The results indicated that the cumulative ET of maize were 593.72 mm and 395.21 mm during the whole growth period in full and deficit irrigation treatments, respectively, and the corresponding average daily ET were 4.24 mm/d and 2.82 mm/d. Based on ET profiles in various growth stages, the ET was relatively minimal in sowing stage, just accounting for 3.7% and 5.8% of the whole growth period in full and deficit irrigation treatments. ET rose rapidly from jointing stage, and reached the maximum in tasseling stage with the total ET of 279.38 mm and 166.76 mm, accounting for 47.1% and 42.2% of the whole period in full and deficit irrigation treatments, respectively, and the average daily ET were 8.47 mm/d and 5.05 mm/d. For hourly ET profiles, a peak ET occurred at around noon but low ones were observed in the morning and evening. The path analysis showed that the decision coefficients of saturated water vapor pressure and average temperature were the largest, demonstrating two factors are the most important environmental driving factors for ET. Wind speed had the minimum effect on ET variation in two irrigation treatments, exhibiting an indirect effect on ET mainly. The main meteorological factors affecting ET of maize in Hetao Irrigated District were saturated vapor pressure and ambient temperature.
Key wordsmaize   evapotranspiration   Hetao Irrigation District   large-scale weighing lysimeter   path analysis   
收稿日期: 2018-05-16;
基金资助:

“十三五”国家重点研发计划项目(2016YFC0400205);国家自然科学基金重点资助项目(51539005);国家自然科学基金资助项目(51769024)

引用本文:   
刘美含,史海滨*,李仙岳等. 河套灌区玉米农田蒸散动态变化及其影响因子的通径分析[J]. 排灌机械工程学报, 2018, 36(11): 1081-1086.
LIU Mei-Han,SHI Hai-Bin-*,LI Xian-Yue et al. Dynamic variation of evapotranspiration of maize field in Hetao Irrigation District and path analysis of affecting factors[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(11): 1081-1086.
 
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