摘要
利用Wp4水势仪对桃、杏、樱桃幼树日间叶水势的测定,在此基础上对叶水势日间变化规律及气象因子对叶水势的影响进行了研究。结果表明:两年生幼树春季(5月)晴朗天气条件下叶水势日间变化为单谷曲线,最低值出现在14:00,桃、杏、樱桃分别为-20.5bar、-23bar、-20bar,持续到15:00,之后逐步回升;叶水势随光量子密度、土壤温度、气温增大而下降,随空气相对湿度增大而上升。
Three two-year-old fruit seedling's leaf water potential measured by WP4 water potential guage. The daytime varieties of the leaf water potential and the influence of metrological factors to the leaf water potential were studied. The results showed that the curve of diurnal variation of leaf water potential was demonstrated one peak in clear day, which minimum value of leaf water potential appeared at 14:00, which reached -20.5bar (Amygdalus persica Linn), -23bar (Armeniaca vulgaris Lam), -20bar (Cerasus maximowiczii),and it were high sunrise than sunset.The leaf water potential rose with relative humidity.By contraries,the leaf water potential got down when solar radiation, air temperature, soil temperature rose.
出处
《河南林业科技》
2005年第2期6-8,共3页
Journal of Henan Forestry Science and Technology
基金
国家林业局科技公关项目(99-34-1)
关键词
叶水势
气象因子
日间变化
幼树
<Keyword>Leaf water potential
Metrological factors
Daytime varieties
Seedlings
