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我们用密闭系统红外线气体分析仪,研究花旗松(Pseudotsuga menziesii[Mirb]Franco)的气体交换作用。根据最低点CO_2浓度时的表观光合作用外推,估测表观光呼吸作用;由停止光照后突然释放出的CO_2,得出依光呼吸作用量。表观光合作用随着辐射度、CO_2浓度的增加而增加,表观光合作用的最适温度是10—15℃。表观光呼吸作用随辐射度的增加、温度的升高而增加。依光呼吸作用随辐射度的增加而增加,随温度的升高而增加,但随CO_2浓度的阵低而增加,表观光呼吸作用和依光呼吸作用之差值,说明由光呼吸作用呼出CO_2促成的光合作用随着温度的增高而增加,光照条件下,5℃时暗呼吸作用放出大量的CO_2,但是暗呼吸作用放出的CO_2量在温度较高时减少。
We studied the gas exchange of Pseudotsuga menziesii (Mirb) Franco with a confined system infrared gas analyzer. Based on the extrapolation of apparent photosynthesis at the CO 2 concentration at the lowest point, the apparent photorespiration was estimated; the amount of CO 2 released by the discontinuation of illumination was determined by the amount of photorespiration. Apparent photosynthesis increased with the increase of radiance and CO2 concentration. The optimum temperature of photosynthesis was 10-15 ℃. The apparent light respiration increases with increasing radiation temperature and temperature. The photo-respiration increased with the increase of irradiance and increased with the increase of temperature, but increased with the increase of CO_2 concentration. The difference of apparent photorespiration and photorespiration indicated that exhaled CO 2 The photosynthesis contributed to the increase of temperature. Under light conditions, dark respiration at 5 ℃ released a large amount of CO_2, but the amount of CO_2 released by dark respiration decreased at higher temperatures.