[Objective]To expand the research on physiological and ecological characteristics of seed melon and watermelon and enhance the cultivation techniques for growing the two types of melon in sandy land.[Method]Two main cultivars,seed watermelon'Jingyuan Daban'and watermelon'Jinhua',were se-lected to measure 7 photosynthetic indexes.[Result]The net photosynthetic rate of 'Jinhua'was 2.97 μmol/(m2·s)higher than 'Jingyuan Daban'.Rather than 'JinHua',the midday depression of photosyn-thesis was observed in 'Jingyuan Daban'.The light saturation point and light compensation point of 'Jin-hua'were 242.43 μmol/(m2·s)and 14.45 μmol/(m2·s)higher than 'Jingyuan Daban'respectively. The Tr and Ci were the key factors affecting the photosynthetic capacity of two cultivars.[Conclusion]The photosynthetic capacity of 'Jinhua'was higher than 'Jingyuan Daban',but its transpiration and water de-mand were also higher.Compared with 'Jinhua','Jingyuan Daban'although performed lower photosyn-thetic ability,its drought resistance and water retention performance were better and was more suitable for arid environment.%[目的]为丰富旱砂籽瓜及西瓜生理生态方面的研究,探索 2 种瓜类的栽培技术措施及旱砂地种植模式.[方法]以靖远旱砂地主栽籽瓜品种'靖远大板'和主栽西瓜品种'金花'为试材,测定分析了 2 种瓜类光合速率日变化的 7 项指标、光响应曲线、光饱和点及光补偿点等光合生理特征.[结果]'金花'净光合速率日变化均值大于'靖远大板'2 .9 7 μmol/(m2·s),无明显光合"午休"现象,而'靖远大板'则有明显的光合午休;'金花'的光饱和点及光补偿点较'靖远大板'高 242.43 μmol/(m 2·s)、14.45 μmol/(m 2·s);蒸腾速率和胞间 CO2浓度是决定 2 种瓜类光合能力的关键因子.[结论]'金花'在光合能力优于'靖远大板',但其蒸腾作用也更强烈,对水分的需求更大,相较之下'靖远大板'虽光合能力较弱但抗旱保水性能更好,更适于干旱少雨的环境.
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