利用作物冠气温差估算农田蒸散量  

Estimating Daily Evapotranspiration Based on Crop Canopy Temperature and Meteorology Factors in Field

作　　者：黄凌旭 蔡甲冰[1,2] 白亮亮[1,2] 张宝忠[1,2] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [2]国家节水灌溉北京工程技术研究中心,北京100048

出　　处：《中国农村水利水电》2016年第8期76-82,共7页China Rural Water and Hydropower

基　　金："十二五"国家科技支撑计划资助项目(2012BAD08B01;2012BAD08B04);水利部公益性行业科研专项经费项目(201501031)

摘　　要：准确估算农田蒸散量,对于促进节水型农业和旱地农业的发展、科学管理有限的水资源、评估环境变化对农业生态系统的影响等具有重要意义。利用河套灌区解放闸灌域农田连续观测的玉米、向日葵的冠层温度和田间气象要素等数据,采集并计算出Seguin和Itier简化模型中日蒸散量ETd、日净辐射Rnd和冠气温差(Ts-Ta),并对模型中参数a、b进行了回归和拟合,检验其在当地的适用性。结果表明,该简化模型可以用于估算玉米和向日葵的日蒸散量,以每日13∶00时数据拟合效果最优,决定系数R2分别为0.690和0.864;日蒸散量估算模型中玉米田块参数a和b分别为-0.859和-0.116,向日葵田块参数a和b分别为0.548和-0.343。研究结果可为大面积遥感反演区域农田耗水提供参考依据。The accurate estimation of crop evapotranspiration, for the promotion of water-saving agriculture and dryland farming, sci- entific management of limited water resources, assessment of environmental change impact on the agricultural ecosystem has impor- tant significance. The Seguin and Itier simplified model, which relates the daily evapotranspiration （ETd） to daily net radiation （Rnd） with measurements of surface and air temperature was used for the calculation. Using continuous observation of maize and sunflower canopy temperature and meteorological data in Jiefangzha Irrigation Scheme of Hetao Irrigation District, calculated ET, Rnd and canopy-air temperature difference （Ts-Ta ）. The applicability of the model was analyzed by linear regression. The results show that the simplified model can be used to estimate the daily evapotranspiration of maize and sunflower. Moreover 13：00 daily of data provide a better fit to the real data, coefficient of determination R2 respectively is 0. 690 and 0. 864. Daily evapotranspiration es- timation models maize plot parameters a ＆ b are --0. 859 and --0. 116, sunflower plot parameters a ＆ b are 0. 548 and --0. 343. Results for Remote Sensing large area of farmland water to provide a reference.

关 键 词：冠气温差 日蒸散量 玉米 向日葵 估算模型 

分 类 号：S274.1[农业科学—农业水土工程] TV93[农业科学—农业工程]