Effect of Water Stress on Photosynthesis, Respiration, and Transpiration of Four Abies Species
Effect of Water Stress on Photosynthesis, Respiration, and Transpiration of Four Abies Species
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水分胁迫对四种冷杉物种光合作用、呼吸和蒸腾作用的影响
DOI：
10.1139/x73-040
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
G. S. Puritch
中科院分区：
文献类型：
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作者：
G. S. Puritch
对加拿大4种冷杉树种的净光合作用、呼吸速率和蒸腾速率与水分胁迫的关系进行了研究。净光合作用在最初的最适速率后，随着水分胁迫的加剧，分三个阶段下降。一个快速的线性下降速度，第二个更缓慢的下降，最后是一个稳定的零净光合作用速度。在4种树种中，沙打旺的光合作用受水分胁迫的影响最小，而木犀草的光合作用受水分胁迫的影响最大。呼吸作用在与光合作用大致相同的水分胁迫下下降，但仅减少到最大速率的40%-75%之间，具体取决于物种。蒸腾作用在与光合作用相似的水分胁迫下下降，在最初的下降之后，在水分胁迫达到35bar时继续保持在最大速率的10%-30%之间。
The relationship between water stress and rates of net photosynthesis, respiration, and transpiration was determined for four Abies species native to Canada. Net photosynthesis, after an initial optimum rate, declined in three phases as water stress increased, viz. a rapid linear rate of decline, a second more gradual reduction and, finally, a steady rate of zero net photosynthesis. Of the four species, photosynthesis of A. grandis was affected the least by water stress, whereas that of A. balsamea was affected the most. Respiration declined at about the same water stress as photosynthesis, but was only reduced to between 40–75% of the maximum rate, depending on the species. Transpiration declined at similar water stresses to those of photosynthesis and after an initial decline, continued at between 10–30% of the maximum rate at water stresses up to 35 bars.