成龄枣树光合特性与光响应曲线模型

【目的】 不同灌溉定额条件下,研究红枣光合特性变化规律及适用于滴灌模式下红枣的光响应曲线模型,为红枣滴灌决策提供数据支撑和理论依据。【方法】 以新疆南疆阿克苏地区进行地表滴灌的6年生红枣树为研究对象,通过田间试验测定不同水分处理条件下的光合-光响应曲线。【结果】 6年生红枣在20、30 m³667 m²灌溉水量区间内,最大净光合速率呈递减趋势。拟合模型针对新疆南疆成龄枣树叶片适用性排序为直角双曲线修正模型＞非直角双曲线模型＞指数模型＞直角双曲线模型。通过对比分析4种不同模拟机制的模型。【结论】 在轻度水分胁迫条件下有利于提高净光合速率及水分利用效率;直角双曲线修正模型对于南疆成龄枣树叶片的适用性最好。

Photosynthetic Characteristics and Light Response Curve Model of Mature Jujube in Southern Xinjiang

【Objective】 To explore the variation of photosynthetic characteristics of jujube under different irrigation quota conditions and the light response curve model suitable for drip irrigation mode in the hope of providing data support and theoretical basis for accurate drip irrigation decision of jujube (Zizyphus jujuba Mill.) 【Methods】 The photosynthetic photosynthetic response curve under different water treatment conditions was determined by field test with 6-year red jujube tree for surface drip irrigation in Aksu area. 【Result】 The maximum net photosynthetic rate of 6-year-old jujube showed a decreasing trend in the irrigation water amount range of 20 m³/667 m², 30 m³/667 m²]. The order of fitting effects of the four models on photosynthetic response of jujube leaves was: rectangular hyperbola modified model > non-rectangular hyperbola model > exponential model > rectangular hyperbola model. 【Conclusion】 The analysis of photosynthetic properties of jujube trees in southern Xinjiang showed that in the condition of mild water stress, the net photosynthetic rate and the water use efficiency were improved; in the model fitting aspect, the right-angle hyperbola modified model had the best applicability to the leaf of the date-growing jujube in the southern Xinjiang.