CO<sub>2</sub>加富处理甜瓜幼苗光合特性的研究

CO₂加富处理甜瓜幼苗光合特性的研究

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800，1000，1200，1400 μL/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1200 μL/L左右。

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.