滴灌条件下枣园蒸散量的不同时空尺度转换研究  

Study on different temporal and spatial scales of evapotranspiration in jujube orchard under drip irrigation

作　　者：郑明 赵经华[1] 马英杰[1] 洪明[1] Zheng Ming;Zhao Jinghua;Ma Yingjie;Hong Ming(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院

出　　处：《石河子大学学报（自然科学版）》2019年第2期162-169,共8页Journal of Shihezi University(Natural Science)

基　　金：新疆维吾尔自治区重大专项(201130103-1);新疆教育厅创新项目(XJEDU2017T004);中国农业大学—新疆农业大学联合基金项目(2015TC051)

摘　　要：为探究不同时间步长计算日蒸腾量及不同时空蒸散量的差异性,本文研究运用涡度相关系统、茎流仪及微型蒸发器对枣园蒸散量、枣树茎流量及土壤蒸发进行监测。结果表明:0 min、30 min及60 min步长下计算日蒸腾基本一致;枣园日蒸散量与日蒸腾量之间的线性回归方程为:y=1.1526x+0.0793,R^2=0.6648;涡度相关系统与茎流系统测定枣园蒸散量之间总差值为15.49 mm,差值占比为4.14%,两者线性回归结果为 y=0.9672x,R^2为0.94,两者之间NSE为0.93、 RSR 为0.26;将微型蒸发器数目进行缩减,缩减后仅保留2、4、6及11号;缩减前与缩减后测定土壤蒸发量之间的线性回归方程为:y=1.0246x,R^2=0.93。由此得出:10 min、30 min及60 min时间步长均可准确计算枣园日蒸腾量;涡度相关系统与茎流仪测定的数据具有较高一致性;茎流系统可以监测枣园尺度蒸散量;微型蒸发器数目可以进行缩减,缩减后不影响整体数据。本文研究结果可为蒸散量尺度转换以及微型蒸发器的合理布设提供可靠依据。To explore the difference of daily transpiration and evapotranspiration measured by different time and space in different time steps. The eddy correlation system, stem flow meter and miniature evaporator were used to monitor the evapotranspiration, stem flow rate and soil evaporation in jujube orchard. The results show that daily transpiration is basically consistent under 10 min, 30 min and 60 min steps, the linear regression equation between the daily transpiration and the daily transpiration of jujube orchard is y=1.1526x+0.0793, R^2 is 0.6648, and the total difference between the eddy correlation system and the stem flow system is 15.49 mm and the ratio of difference is 4.14%. The linear regression resultis y=0.9672x, R^2 was 0.94, the NSE is 0.93, RSR is 0.26;the number of micro evaporators is reduced, and only 2, 4, 6 and 11 are retained. The linear regression equation between the prereduction and the reduction of soil evaporation is y=1.0246x, R^2=0.93. The results showed that:10 min, 30 min and 60 min time step can accurately calculate the daily transpiration of jujube orchards;the data measured by eddy correlation system and stem flow meter have high consistency;stem flow system can monitor the scale evapotranspiration of jujube orchards;the number of micro evaporators can be reduced without affecting the overall data.

关 键 词：蒸散量 蒸腾量 土壤蒸发量 涡度相关性 茎流 

分 类 号：S163.5[农业科学—农业气象学]