木本植物水势的日变化模式。
Diurnal pattern of water potential in woody plants.
作者信息
Klepper B
机构信息
Commonwealth Scientific and Industrial Research Organization, Division of Irrigation Research, Griffith, N. S. W. 2680, Australia.
出版信息
Plant Physiol. 1968 Dec;43(12):1931-4. doi: 10.1104/pp.43.12.1931.
Abstract
The dynamic relationship between the rates of water loss and uptake controls plant water status. Marked diurnal variations in water potential of both leaves and fruit occurred in all plants studied. Variations in water status during the day were most clearly related to changes in evaporative demand of the air and were different for the east and west sides of a tree. At night, the plant water potential reflected the soil moisture status.Changes in the water potential of pear fruit were correlated with changes in fruit diameter. Since water loss from fruit occurred mostly through the pedicel into the xylem of the tree, the fruit could be used as a crude gauge of xylem water potential, which also showed dramatic changes during the day.
摘要
水分散失速率与吸收速率之间的动态关系控制着植物的水分状况。在所研究的所有植物中，叶片和果实的水势均出现明显的昼夜变化。白天水分状况的变化与空气蒸发需求的变化最为密切相关，且树木东西两侧有所不同。夜间，植物水势反映土壤水分状况。梨果实水势的变化与果实直径的变化相关。由于果实水分散失主要通过果柄进入树木木质部，果实可作为木质部水势的粗略指标，其在白天也呈现出显著变化。
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本文引用的文献
1
Leaf water potentials measured with a pressure chamber.用压力室测量叶片水势。
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