农田不同尺度蒸散量的尺度效应与气象因子的关系  

Study on scale effect of farmland evapotranspiration and relationship with meteorological factors

作　　者：刘国水[1] 刘钰[1] 蔡甲冰[1] 许迪[1] 

机构地区：[1]中国水利水电科学研究院水利研究所,北京100048

出　　处：《水利学报》2011年第3期284-289,共6页Journal of Hydraulic Engineering

基　　金：国家973计划项目课题(2006CB403405);水利部公益行业专项项目(201010068-2);中国水科院博士生学位论文创新研究支助课题

摘　　要：本文以田间实测数据为基础,对比了大型称重式蒸渗仪和涡度相关仪测定的夏玉米生育期蒸散量的变化规律,用回归分析的方法研究了蒸散量的尺度效应与气象因子(净辐射、空气湿度、温度和风速)的关系。研究表明:(1)大型称重式蒸渗仪和涡度相关仪的测量数据变化规律一致,相关性较好,但由于二者的测量空间尺度不同,导致称重式蒸渗仪的测量值明显高于涡度相关仪;(2)不同时间和空间尺度的蒸散量与净辐射的相关关系均较好,但与空气湿度、温度和风速的相关关系随尺度变化而变化。This article compared the evapotranspiration values of summer maize measured by lysimeter and eddy covariance,and also analyzed the correlation between meteorological factors and evapotranspiration values of two spatial scales.The evapotranspirations measured by lysimeter and eddy covariance represent observation results in different farmland scales.Study results show that（1） good correlation can be found between the measurement results of lysimeter and eddy covariance,but the daily values measured by lysimeterate significantly higher than that by eddy covariance due to different spatial scales;（2） good correlation can also be found between the evapotranspiration and the net radiation,but the correlations between evapotranspiration and other meteorological factors are dependent on temporal and spatial scales.

关 键 词：蒸散量 大型称重式蒸渗仪 涡度相关仪 气象因子 

分 类 号：S161.4[农业科学—农业气象学]