日光温室与露地红玛瑙甜樱桃光合特性比较

以甜樱桃品种红玛瑙为试材,在日光温室内和露地条件下对其光合特性进行研究。结果表明,日光温室与露地栽培红玛瑙的光补偿点分别为29.6,32.97μmol(/m2.s),光饱和点分别为2 200,2 283.3μmol(/m2.s),说明温室红玛瑙对光强的适应范围变小了,但对弱光的光能利用率却增强了;日光温室与露地栽培红玛瑙的CO2补偿点分别为51.88,60.61μmol/mol,饱和点分别为1 933,1 822μmol/mol;这说明温室与大田比较,红玛瑙光合利用CO2浓度的范围较大,较高浓度CO2有利于温室红玛瑙的光合作用;日光温室与露地栽培红玛瑙樱桃净光合速率日变化均呈双峰曲线,但峰值出现的时间略有不同,且温室红玛瑙日变化2次高峰值均低于露地栽培。

Studies on Photosynthetic Characteristics of Sweet Cherry Hongmanao in Greenhouses and Open Field

Photosynthetic characteristics of Hongmanao sweet cherry cultivated both in greenhouses and in open field were studied using Li-6400 portable photosynthesis system.Results showed that the light compensation points of Hongmanao in green houses and in open field were 29.6 and 32.97 μmol/(m2·s)respectively,while the light saturation points were 2 200 and 2 283.3 μmol/(m2·s) respectively,which indicated that the adaptive range of Hongmanao to light intensity was diminished,and utilization efficiency of dim solar energy increased.The CO2 compensation points of Hongmanao in greenhouses and in open field were 51.88 and 60.61 μmol/mol respectively,while the CO2 saturation points were 1 933 and 1 822 μmol/mol respectively,which indicated that photosynthetic CO2 concentration of Hongmanao in greenhouses had a wider range than that cultivated in open field,and high concentrations of CO2 was beneficial to photosynthesis of Hongmanao in greenhouses.The diurnal variation of net photosynthetic rate of Hongmanao in both greenhouses and open field presented a double-peak curve,but emergence time of the peak value showed a little difference.Besides,the two peak values of Hongmanao in greenhouses were lower than those in open field.