干旱区生态环境知识资源中心(Arid): 干旱区两种微气象学法测定农田蒸散发的比较研究

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	干旱区两种微气象学法测定农田蒸散发的比较研究
其他题名	Comparison of two micrometeorological methods for evaluating field evapotranspiration in the oasis of Northwest China
	张鑫; 佟玲; 李思恩; 康绍忠
来源期刊	水利学报
ISSN	0559-9350
出版年	2011
卷号	42 期号:12 页码:1470-1478
中文摘要	利用涡度相关系统(EC)和波文比系统(BREB)监测干旱区农田蒸散发变化,从时间步长、天气条件、生育期以及灌溉的影响四方面入手,对比研究了两种方法在测定农田蒸散发方面的差异,并从仪器测量精度以及大气湍流稳定状况两个方面着重分析了引起这两种观测方法产生差异的原因。结果表明:Rn-G测定的不确定性及温湿度探头精度是引起两种方法测定差异的主要原因。受BREB传感器精度的限制,灌水后该法测定农田蒸散发偏低。受大气湍流稳定度的影响,晴天条件下两种方法测定蒸散发差异较小,阴天条件下差异较大。相对于EC而言,全生育期BREB高估总蒸散发约6.1%;在生育前期BREB测定蒸散发偏高,生育后期测定蒸散发偏低。
英文摘要	Measuring field evapotranspiration(ET) accurately is of great importance in investigating the hydrologic process,developing hydrological models and improving the water use efficiency. Bowen ratio-energy balance method(BREB) and Eddy covariance method(EC) were used to monitor the process of field evapotranspiration in the oasis of Northwest China. Probably there is discrepancy between ET value evaluated by these two methods when time scale,weather condition and growth stages are different. This paper examined the effects of equipment resolution and atmospheric stability on the discrepancy. The results show that the uncertainty of Rn-G and the resolution of sensors have a strong effect on the discrepancy. Due to the limited resolution,BREB underestimated ET after irrigation. The discrepancy is higher during the cloudy days under stable atmospheric conditions than that during the sunny days under unstable atmospheric conditions. Compared with EC,the total ET estimated by BREB was 6.1% higher. BREB overestimated daily ET during the early growth stage,while underestimated it during the late growth stage.
中文关键词	波文比法 ; 涡度相关法 ; 蒸散发 ; 大气稳定度
英文关键词	Bowen ratio-energy balance method Eddy covariance method evapotranspiration atmospheric stability
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4429677
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227042
作者单位	中国农业大学中国农业水问题研究中心, 北京 100083, 中国
推荐引用方式 GB/T 7714	张鑫,佟玲,李思恩,等. 干旱区两种微气象学法测定农田蒸散发的比较研究[J]. 中国农业大学,2011,42(12):1470-1478.
APA	张鑫,佟玲,李思恩,&康绍忠.(2011).干旱区两种微气象学法测定农田蒸散发的比较研究.水利学报,42(12),1470-1478.
MLA	张鑫,et al."干旱区两种微气象学法测定农田蒸散发的比较研究".水利学报 42.12(2011):1470-1478.