【摘要】 以甜瓜幼苗为试材,研究不同浓度CO2对其光合特性的影响。结果表明:与对照相比,经800,1000,1200,1400μL/L加富的甜瓜幼苗的最大净光合速率的增幅分别为39.59%、70.52%、80.64%和131.21%。蒸腾速率分别下降:12.16%、27.18%、37.34%和54.65%,同时叶气温差也呈上升趋势。胞间CO2浓度上升12.04%~14.25%。高浓度CO2在降低甜瓜幼苗光补偿点的同时,还使光饱和点升高。甜瓜幼苗CO2加富的适宜浓度为1200μL/L左右。更多还原

【Abstract】 Effects of CO₂ enrichment on photosynthetic characteristics of melon seedlings were studied in the experiment.The results indicated that different concentrations of CO₂ enrichment（800,1000,1200,1400 μL/L） could obviously promote the maximum（photosynthetic） rates.Comparing with CK,the maximum photosynthetic rates increased by 9.59%,70.52%,80.64% and 131.21% respectively. Meanwhile,the transpiration rates descended respectively by12.16%,27.18%,37.34% and 54.65%.The difference between leaf and air temperature increased.Intercellular CO₂ concentration also increased by 12.04%¹4.25%.With increasing CO₂ concentration,the light compensation point（LCP） decreased,but the light saturation point（LSP） increased.The optimal concentration of CO₂ enrichment in melon seedlings was about 1200 μL/L.更多还原