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有机种植是在生态学理论指导下的一种重要的种植体系,但是缺乏对其深入的机理研究。该试验以结果时期的黄瓜、豇豆和番茄为研究对象,测定其在有机种植条件下叶片的光合特性、叶绿素荧光参数和叶绿素相对含量等指标,研究三者叶片光合特性的特点与差异。结果表明:3种有机蔬菜叶片的叶绿素含量大小为豇豆>黄瓜>番茄;3种有机蔬菜的净光合速率Pn、蒸腾速率Tr和气孔导度Gs对光强的响应为:豇豆>黄瓜>番茄,拟合的最大净光合速率Pnmax和光饱和点LSP的大小为:黄瓜>豇豆>番茄,表观量子效率AQE、光补偿点LCP和暗呼吸速率Rd的大小为豇豆>黄瓜>番茄;PSⅡ光化学效率(Fv/Fm)和PSⅡ潜在活性(Fv/Fo)大小均为黄瓜>豇豆>番茄。综合以上结果得出,有机黄瓜和豇豆的叶片的光合固碳能力较强,番茄弱之。
Organic planting is an important planting system under the guidance of ecological theory, but it lacks deep research on its mechanism. In the experiment, cucumber, cowpea and tomato were used as the research objects to measure their leaf photosynthetic characteristics, chlorophyll fluorescence parameters and chlorophyll relative content under organic cultivation conditions, and to study the characteristics and differences of photosynthetic characteristics of the three leaves. The results showed that the chlorophyll content of three kinds of organic vegetables was cowpea> cucumber> tomato. The net photosynthetic rate Pn, transpiration rate Tr and stomatal conductance Gs of three organic vegetables responded to light intensity: cowpea> cucumber> tomato, The maximum net photosynthetic rate (Pnmax) and light saturation point (LSP) of cucumber> cowpea> tomato were AQE, light compensation point LCP and dark respiration rate Rd were cowpea> cucumber> tomato; PSⅡ photochemical efficiency Fv / Fm) and PSⅡ potential activity (Fv / Fo) were cucumber> cowpea> tomato. Based on the above results, the photosynthetic carbon fixation ability of organic cucumber and cowpea leaves is strong, and the tomato is weak.