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为研究水分亏缺对旱区压砂瓜光合特性及产量的影响,以“金城5号”西瓜嫁接苗为试材,设3个灌水水平,分别为667m2灌溉0(T1)、1.5(T2)、3.0(T3)m~3。结果表明:压砂瓜坐果期净光合速率和气孔导度日变化规律均表现为双峰曲线,蒸腾速率日变化规律表现为单峰曲线,与灌水定额呈正相关;胞间CO_2浓度变化规律与净光合速率相反,与灌水定额呈负相关。综合分析得出,在当地水资源缺乏情况下,旱区压砂瓜人工穴灌较适宜的灌水定额为667m~2灌溉3.0m~3。
In order to study the effect of water deficit on photosynthetic characteristics and yield of sand mulching in arid region, three irrigation levels of 667m2 irrigation 0 (T1), 1.5 ( T2), 3.0 (T3) m ~ 3. The results showed that the diurnal variation of net photosynthetic rate and stomatal conductance of squash during the fruit setting showed a bimodal curve. The diurnal variation of transpiration rate showed a unimodal curve, which was positively correlated with the irrigation quota. The variation of intracellular CO 2 concentration was similar to net On the contrary, photosynthetic rate was negatively correlated with irrigation quota. Comprehensive analysis shows that under the condition of a lack of local water resources, the suitable irrigation quota of artificial sand irrigation for dry sand is 667m2-2.0m3.