氮肥对北疆滴灌复播青储玉米光合特性及养分利用的影响
Effects of nitrogen fertilizer on the photosynthetic characteristics and nutrient utilization of drip irrigated silage maize by sequential cropping in north Xinjiang

为了解氮肥对北疆滴灌复播青储玉米生理指标的影响，提高氮肥利用效率，通过田间小区试验，研究了一管一行毛管布置模式下，不同氮肥处理（100、170、240、310、380 kg·hm-2）对复播青储玉米光合特性、土壤铵态氮分布的影响。结果表明，不同氮肥处理条件下复播玉米叶片净光合速率、蒸腾速率日变化曲线均呈单峰型；土壤铵态氮含量总体上随施氮量的增加先减少后增加；产量随施氮量的增加先增加后减小。综合分析认为，一管一行毛管布置模式下，240 kg·hm-2的施氮量处理下水氮耦合效果最佳，土壤铵态氮含量总体最少，产量与叶片水分利用效率最高，净光合速率较高。
In order to investigate the effects of nitrogen (N) fertilizer on the physiological indexes of drip irrigated silage maize by sequential cropping in north Xinjiang, to increase N fertilizer utilization efficiency, through the field plot experiments have researched the effects of photosynthetic characteristics and soil NH4+-N distribution under the layout pattern of one row with one lateral pipe and different N fertilizer treatments (i.e., 100, 170, 240, 310 kg·hm-2 and 385 kg·hm-2). The results showed that: For different N fertilizer treatment condition, the daily change curves of the net photosynthetic rate of the leaves and transpiration rate of the sequential cropping maize displayed a single peak type. Holistically, soil total NH4+-N content decreased at first and then increased with increasing the N application. The yield increased at first and then decreased with increasing N application. Through the comprehensive analysis, we think under the layout pattern of one row with one lateral pipe, the N fertilizer application treatment of 240 kg·hm-2 was the best effect of water-N coupling with the lowest soil total NH4+-N content, highest yield and water use efficiency of the leaf, and a relatively high net photosynthetic rate.