土壤水分连续变化过程对盆栽红叶石楠苗期蒸腾特性的影响  

Water potential and transpiration with decreasing soil moisture in Photinia frasery potted seedlings

作　　者：杨静[1] 王华田[1] 宋承东[2] 张培法 王迎[2] 谭秀梅[1] 董玉峰[1] 

机构地区：[1]山东农业大学林学院,山东泰安271018 [2]山东省泰安市泰山林业科学研究院,山东泰安271000

出　　处：《浙江林学院学报》2008年第5期670-674,共5页Journal of Zhejiang Forestry College

基　　金：山东省农业良种产业化项目(鲁农良种字[2005]10号)

摘　　要：研究了在连续土壤水分变化过程中盆栽红叶石楠Photinia frasery 2年生扦插苗的土壤水势、叶片水势和蒸腾速率的日周期变化和连日变化过程,以期找出土壤水分条件对红叶石楠的蒸腾特性的影响。结果表明:随干旱胁迫的加重和土壤水势的持续下降,土壤水势和叶片水势日变化过程均呈V字型,于10:00-14:00达全天最低值,且波动幅度随水分胁迫加剧而加大;日平均蒸腾速率随土壤水势下降逐渐下降,蒸腾速率日变化波动幅度逐渐减小,蒸腾速率高峰值出现时间逐渐提前,由开始胁迫的10:00(3.620 mmol.m-2.s-1)提前到最后的8:00(0.952 mmol.m-2.s-1)。相关性分析表明,红叶石楠的蒸腾速率与土壤水势和叶片水势呈极显著(r=0.804**)和显著(r=0.566*)正相关。Diurnal soil and leaf water potential as well as transpiration rate of 2-year-old potted seedlings of Photiniafrasery were studied with decreasing soil moisture conditions during the testing period. Also, a correlation analysis between the transpiration rate of the soil versus leaf water potential was conducted. Results indicated that the change of daily soil and leaf water potential was a ＇V＇ shape with daily fluctuation range increasing as drought stress rose during the testing period. As soil water potential decreased over the experimental period, the daily mean transpiration rate decreased with daily fluctuation range decreasing and the transpiration peak occurring sooner. The correlation analysis showed that the correlation between transpiration rate and soil water potential was extremely signifieant（r = 0.804, P〈0.01）, while that of transpiration rate and leaf water potential was significant（r = 0.566, P〈 0.05）. [Ch, 3 fig. 1 tab. 19 ref.]

关 键 词：植物学 红叶石楠 蒸腾特性 水势 

分 类 号：S718.3[农业科学—林学]