Lange O L, Schulze E -D, Evenari M, Kappen L, Buschbom U
Botanisches Institut II der Universität Würzburg, Wurzburg, Germany.
Avdat Farm and Desert Research Center of the Hebrew University, Jerusalem.
Oecologia. 1974 Jun;17(2):97-110. doi: 10.1007/BF00346273.
Temperature dependence of net photosynthesis under conditions of light saturation and maximum air humidity was measured throughout the season in the Central Negev Desert (Israel). Experimental plants were the wild growing Hammada scoparia and Prunus armeniaca cultivated in the runoff farm of Avdat.The optimum temperature for net photosynthesis and the upper temperature compensation point of CO exchange showed a characteristic seasonal variation with low values in spring and fall and high values in mid-summer. This shift was exhibited by plants growing under conditions of normal soil-water stress as well as by irrigated plants. There was no general correlation between the changes in temperature dependence of net photosynthesis of the plants, their maximum photosynthetic capacity under the experimental conditions, their daily photosynthesis maximum under natural conditions, and their rate of dark respiration. The seasonal shift of the photosynthetic response to temperature cannot be explained by changes in the temperature sensitivity of the stomata. It may be caused by seasonal changes of biochemical and/or biophysical properties.A number of observations made on other wild plants also showed, in all cases, seasonal shifts of the upper temperature compensation point, with an amplitude of 6.0°C-13.7°C.
在整个季节中，于以色列内盖夫沙漠中部，在光照饱和及空气湿度最大的条件下，对净光合作用的温度依赖性进行了测量。实验植物为野生的滨藜和种植在阿夫达特径流农场的杏树。净光合作用的最适温度以及二氧化碳交换的温度补偿上限呈现出典型的季节性变化，春季和秋季数值较低，仲夏时较高。正常土壤水分胁迫条件下生长的植物以及灌溉植物均表现出这种变化。植物净光合作用温度依赖性的变化、实验条件下它们的最大光合能力、自然条件下它们的每日最大光合作用以及它们的暗呼吸速率之间不存在普遍的相关性。光合作用对温度响应的季节性变化无法用气孔温度敏感性的变化来解释。它可能是由生化和/或生物物理特性的季节性变化引起的。对其他野生植物的一些观察在所有情况下也都显示，温度补偿上限存在季节性变化，幅度为6.0°C至13.7°C。
