Pearcy R W, Harrison A T, Mooney H A, Björkman O
Department of Biology, State University of New York at Albany, 12222, Albany, New York.
Department of Botany, University of Wyoming, 82070, Laramie, Wyoming.
Oecologia. 1974 Jun;17(2):111-121. doi: 10.1007/BF00346274.
Field measurements of CO and water vapor exchange were made on Atriplex hymenelytra (Torr.) Wats. shrubs growing in Death Valley, California during March 1971 and July 1972. Rates of CO uptake and leaf conductances were substantially higher in March as compared to July. In spite of the large differences in ambient temperatures in March and July, no adaptive acclimation response was apparent in the temperature dependence of photosynthesis. Photosynthesis transpiration ratios at typical midday leaf temperatures were much higher in March than in July. High water use efficiency results from a combination of the C photosynthetic pathway, relatively low leaf conductances, and maximum growth and photosynthetic activity during the cooler months of the year.
1971年3月和1972年7月，在加利福尼亚州死亡谷生长的滨藜属灌木上进行了CO和水汽交换的实地测量。与7月相比，3月的CO吸收速率和叶片导度显著更高。尽管3月和7月的环境温度差异很大，但光合作用对温度的依赖性并未表现出明显的适应性驯化反应。典型午间叶片温度下的光合蒸腾比在3月比7月高得多。高水分利用效率源于C光合途径、相对较低的叶片导度以及一年中较凉爽月份的最大生长和光合活性的综合作用。
