摘要
本试验实地测量分析了美国8号苹果树水分指标的日变化。结果表明:茎干和叶片的水势早晨较大,中午前后较小,茎水势变化显著滞后于叶水势的变化;茎流量日变化呈"单峰"曲线,最高值出现在午后;蒸腾速率日变化为"双峰"曲线,有明显的"午休"现象;水分利用效率在一天中呈下降趋势,上午下降幅度较大,下午较小;茎流量与水势、蒸腾速率与温度、水分利用效率与光强等不同生理生态指标之间均存在极显著的相关性。
It was investigated and analyzed that the diurnal variation of water indices of American 8 apple trees in this experiment.The results showed that the water potential of stem and leaf were higher in the morning and lower around noon; the water potential change of stem lagged significantly behind that of leaf. The diurnal variation of stem flow showed a single - peak curve whose highest value appeared in the afternoon. But the diurnal variation of transpiration rate presented a double - peak curve with typical ＂lunch break＂ phenomenon. The water use efficiency showed decreasing trend all the day, and the decrease was larger in the morning than that in the afternoon. There were significant relativities between stem flow and water potential, transpiration rate and air temperature, water use efficiency and solar radiation density and so on.
出处
《山东农业科学》
2009年第4期45-48,共4页
Shandong Agricultural Sciences
基金
国家"863"计划项目(2008AA10Z219)
国家现代苹果产业技术体系功能岗位专家项目[2008-01(02)]
关键词
苹果树
水势
蒸腾速率
茎流量
水分利用效率
AppLe tree
Water potential
Transpiration rate
Stem flow
Water use efficiency
