干旱区生态环境知识资源中心(Arid): 干旱内陆区玉米田水热通量特征及主控因子研究

Arid

	干旱内陆区玉米田水热通量特征及主控因子研究
其他题名	Characteristics of water vapor and heat fluxes and the controlling factors over an maize field in the arid inland region
	丁日升 1; 康绍忠 1; 张彦群 2; 佟玲 1; 李思恩 1
来源期刊	水利学报
ISSN	0559-9350
出版年	2014
卷号	45 期号:3 页码:312-319
中文摘要	研究农田水热通量特征对于理解变化环境下农田水循环和提高农业水管理极为重要。本文分析了涡度相关系统测定的干旱内陆区两年(2009和2010年)两种水分(充分和亏缺)条件下玉米田水热通量,以揭示不同气象和水分环境下水热通量特征及主控因子。结果表明潜热通量(lambdaET)是玉米田能量的主要消耗项。2年的半小时尺度平均lambdaET差别较大,最大值分别为318.9和279.1W/m~2;夜间lambdaET占每日值的比例分别为1.7%和16.6%。lambdaET季节变化与叶面积指数同步,但干旱感热平流会增大2009年中期lambdaET。lambdaET年际变化主要由均衡蒸发(lambdaET_(eq))决定。标准化lambdaET(lambdaET/lambdaET_(eq))对冠层导度(G_c)响应关系为指数增长到最大值函数;两年lambdaET/lambdaET_(eq)对G_c响应阈值不同, 2009年为20mm/s,2010年为15mm/s。另外,G_c对lambdaET季节变化的控制是动态变化的,生育前期和后期lambdaET受G_c控制较强,而中期受Gc控制较弱;2010年G_c对lambdaET控制程度比2009年强。
英文摘要	Studying the characteristics of water vapor and heat fluxes over cropland is of great importance for understanding water cycle in cropland and improving agricultural water management under changing environment. The fluxes over a maize field in the arid inland region were measured by eddy covariance technique under two soil water regimes (well-watered and deficit) for two years (2009 and 2010). The objective is to explore the variations of fluxes and the controlling factors under different meteorological and water regimes. The results show that latent heat flux (lambdaET) is a major consumption component of available energy. The difference was greater for the averaged half-hourly lambdaET of the two years,with maximum values of 318.9 and 279.1W/m~2,respectively. Night time lambdaET accounted for 1.7% and 16.6% of daily values for the two years,respectively. Seasonal variations of lambdaET were synchronic with leaf area index,but advection of arid sensible heat would enhance lambdaET at the mid-season in 2009. Inter-annual variations of lambdaET were determined by equilibrium evaporation (lambdaET_(eq)). The response of standardized lambdaET to canopy conductance (G_c) was the function of exponential rise to maximum. However,the response thresholds were different for the two years,with 20mm/s for 2009 and 15mm/s for 2010,respectively. Moreover,the seasonal variations of lambdaET controlled by G_c was dynamic,i.e.,G_c had stronger control on lambdaET at the early and later stages than at the middle stage. The degree of variations of lambdaET controlled by G_c in 2010 was greater than that in 2009. These quantitative results can be directly used to the model of water and heat fluxes,and also improve crop water use efficiency.
中文关键词	潜热通量 ; 均衡蒸发 ; 冠层导度 ; 玉米田 ; 涡度相关系统
英文关键词	latent heat flux equilibrium evaporation canopy conductance maize field eddy covariance
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:5103299
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/2XILL650/231709
作者单位	1.中国农业大学中国农业水问题研究中心, 北京 100083, 中国; 2.国家节水灌溉北京工程技术研究中心, 国家节水灌溉北京工程技术研究中心, 北京 100048, 中国
推荐引用方式 GB/T 7714	丁日升,康绍忠,张彦群,等. 干旱内陆区玉米田水热通量特征及主控因子研究[J]. 中国农业大学,2014,45(3):312-319.
APA	丁日升,康绍忠,张彦群,佟玲,&李思恩.(2014).干旱内陆区玉米田水热通量特征及主控因子研究.水利学报,45(3),312-319.
MLA	丁日升,et al."干旱内陆区玉米田水热通量特征及主控因子研究".水利学报 45.3(2014):312-319.