基于叶片空气温差的温室黄瓜水分胁迫指数的应用分析  

Application Analysis of Water Stress Index of Greenhouse Cucumber Based on Leaf-Air Temperature Difference

作　　者：李国臣[1] 于海业[2] 赵红霞[1] 马成林[2] 

机构地区：[1]井冈山学院工学院,吉安343009 [2]吉林大学生物与农业工程学院,长春130022

出　　处：《吉林农业大学学报》2006年第4期469-472,共4页Journal of Jilin Agricultural University

基　　金：吉林省科技发展基金(20020657);井冈山学院校重点学科专项基金资助项目

摘　　要：针对温室的小气候条件，以生长期的黄瓜作为测试对象，分析了太阳净辐射（Rv）和水汽饱和差（VPD）对叶片温度的影响。结果表明：叶片空气温差（dT）与Rv，和VPD呈显著正相关，Pearson相关系数r=0．78—0．86。此外，在作物充分供水条件下，当Rv≥250—300w／m^2时，黄瓜叶片的温度通常大于空气温度，此时，Idso模型下基线的计算误差较大。因此，根据实验分析，建立了基于圮和VPD的温室作物水分胁迫指标下基线线性回归方程：dTt=0．2543—0．0046Rv-0．4887VPD，回归方程的计算值与测量值均方误差（MSE）为0．24，小于Idso经验模型中的下基线公式的计算误差。The influence of net radiation and VPD on leaf temperature of cucumber grown in greenhouse was studied. The results showed： there was a striking positive correlation between leaf temperature （LT） and net radiation （ Rv ）, the correlation coefficient r = 0.78 - 0.86, furthermore, under well-watered, when Rv≥250- 300 W/m^2, the LT of cucumber was higher than air temperature （AT）, there existed error in the result of the lower baseline equation dTl in measuring temperature difference between leaf and air. According to energy balance equation, a linear regression equation for calculating dT1 was established, and its equation basic model is： dTl = 0.254 3 - 0.004 6Rv - 0.488 7 VPD. The checkout indicated that the mean square error （MSE = 0.24） was smaller than the calculating error when the lower baseline equation dTl of Idso, S.B. was used.

关 键 词：作物水分胁迫指标 叶温 水分胁迫 温室 黄瓜 

分 类 号：S642.2[农业科学—蔬菜学]