以香瓜茄(Solanum murcatum)主栽品种“阿斯卡”为材料,在日光温室条件下进行了不同生育时期和施肥处理下叶片气体交换特性及其日变化、光合速率对光强和CO_2响应的研究。结果表明:反季节生产条件下香瓜茄叶片光合色素含量在生育期内先升高后降低,于开花坐果期至果实膨大期达到峰值,有机肥处理的叶绿素含量显著高于不施肥处理,叶绿素a/b值约2.6,具有弱光适应特征。香瓜茄生育期中叶片气孔导度(Gs)、蒸腾速率(Tr)和净光合速率(Pn)均在果实膨大期达到峰值,有机肥处理的叶片Pn和Gs均值显著高于不施肥处理,但处理间Tr差异不显著。香瓜茄叶片Gs与Tr极显著正相关(r=0.816)、与Pn显著正相关(r=0.555),但Pn与Tr相关性不显著(r=0.415)。自开花坐果期至第一穗果实成熟期,日光温室香瓜茄叶片气体交换参数日变化均呈单峰型,无光合午休现象,Pn、Gs(果实膨大期例外)和Tr均于正午前后达到峰值,施肥处理叶片的Gs和Pn显著高于不施肥处理,但Tr差异不显著。香瓜茄叶片光合速率的光响应特征可以用直角双曲线修正模型模拟、CO_2响应特性可用直角双曲线模型模拟,果实成熟期叶片初始量子效率显著高于、但羧化效率显著低于开花坐果期和果实膨大期,有机肥处理的平均初始量子效率显著低于、但羧化效率显著高于不施肥处理,有机肥处理的叶片补偿光强小于不施肥处理、但饱和光强差异不显著,叶片CO_2补偿点和CO_2饱和点显著低于不施肥处理,但两施肥处理间叶片光呼吸和暗呼吸速率、饱和光强或CO_2条件下的最大净光合速率无显著差异。香瓜茄叶片光合作用可利用光强较高,对弱光利用能力较差,但也有一定弱光适应性,施肥对香瓜茄弱光利用和碳同化能力具有一定调节作用。 Taking the main cultivars of “Solanum murcatum” “Aska ” as materials, the leaf gas exchange characteristics and its diurnal changes under different growth stages and fertilization treatments under sunlight greenhouse conditions were studied. The effects of photosynthesis on the light intensity and CO2 Responsive research. The results showed that the content of photosynthetic pigment in the leaves of Muskmelon rose first and then decreased in the anthesis under antiseptic conditions and peaked during flowering and fruit setting to fruit enlargement. The content of chlorophyll in the organic fertilizer was significantly higher than that in the non-fertilization treatments, and chlorophyll a / b value of about 2.6, with low light adaptation characteristics. The stomatal conductance (Gs), transpiration rate (Tr) and net photosynthetic rate (Pn) of melon leaves reached the peak value during the fruit enlargement period, while the average values ​​of Pn and Gs in organic fertilizer treatments were significantly higher than those without fertilization treatments Tr between the difference was not significant. There was a significant positive correlation between Gs and Tr (r = 0.816) and Pn (r = 0.555), but the correlation between Pn and Tr was not significant (r = 0.415). The diurnal changes of gas exchange parameters of melon leaves in greenhouse were single peak type and no-lunch break phenomenon from the flowering and setting stage to the first ripening stage of fruit. Pn and Gs (Except fruit enlargement period) and Tr peaked at noon , Gs and Pn of fertilization leaves were significantly higher than those without fertilization, but the Tr difference was not significant. The photoresponse characteristics of photosynthetic rate in melon leaves can be simulated by rectangular hyperbolic model. The response characteristics of CO_2 can be simulated by rectangular hyperbolic model. The initial quantum yield of fruit in ripening stage was significantly higher than that of fruit, but the carboxylation efficiency was significantly lower than that of flowering stage In the period of fruit enlargement, the average initial quantum yield of organic fertilizer treatment was significantly lower than that of no fertilizer treatment, but the carboxylation efficiency was significantly higher than that of non-fertilization treatment. The compensation light intensity of organic fertilizer treatment was less than that of no fertilizer treatment, but the difference of saturated light intensity was not significant. The compensation point and CO_2 saturation point were significantly lower than those without fertilization, but there was no significant difference in maximum photosynthetic rate between light and dark respiration rate, saturated light intensity or CO 2 under the two treatments. The photosynthesis of melon leaves can be used with higher light intensity and poor light utilization ability, but also has some weak light adaptability. Fertilization has a certain regulating effect on the light utilization and carbon assimilation ability of melon.