Path analysis of sap flow of tomato under rain shelters in response to drought stress  

作　　者：Shao Guangcheng Huang Doudou Cheng Xi Cui Jingtao Zhang Zhenhua 

机构地区：[1]Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China,Ministry of Education,College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China

出　　处：《International Journal of Agricultural and Biological Engineering》2016年第2期54-62,共9页国际农业与生物工程学报（英文）

基　　金：the National Natural Science Foundation of China(No.51279059);supported by the program of“the Fundamental Research Funds for the Central Universities”(2015B14714);the project of“the Priority Academic Program Development of Jiangsu Higher Education Institutions”and“Jiang Su Qing Lan”.

摘　　要：The physiological characters and growth of tomato(Solanum lycopersicum L.)were recorded to be largely affected by different levels of irrigation.The objectives of this research were to determine the effects of deficit irrigation and rain shelters on sap flow,relative water content and the relationship between sap flow and environmental parameters.Experiments under rain shelters conditions were conducted in southern China during the growing seasons in 2012.The threshold of irrigation was designed at 80%field capacity during the whole period(T1,the control),and 30%,40%and 50%decreased water of T1 were applied as the treatments of T2,T3 and T4.The plants subjected to water stress exhibited a decrease in the values of sap flow rate and relative water content.Calculation of 95%confidence level revealed a significant difference of sap flow rate in T4 and T3 as well as the control on sunny and rainy days.The diurnal variation of the sap flow showed a single peak curve on sunny day,while it demonstrated irregular multi-peak variation on rainy days.The study also showed that the most sensitive environmental indicator affecting sap flow was solar radiation,followed by air temperature and vapour pressure deficit.Direct path coefficient was basically consistent with the coefficient of correlation,but there was slight difference between the total contribution R2 and that of variable factors.

关 键 词：drought stress TOMATO sap flow rain shelters deficit irrigation path analysis 

分 类 号：R57[医药卫生—消化系统]