摘要
采用二次回归正交设计，在移动旱棚水、肥精量控制条件下研究了土壤湿度和施氮量对春玉米产量、耗水量及水分利用效率的影响。结果表明：水氮耦合作用对玉米产量有显著的影响（P〈0．05）。产量随着土壤湿度和施氮量的升高呈先增大后减小的趋势。分析产量模型可知，当土壤湿度为田间持水量的65％～70％、施氮量为462kg·hm^-2时，玉米产量可达15142．5kg·hm^-2。玉米不同处理阶段耗水量均表现为生育前期少，中期缓慢增加，到灌浆期迅速增加的趋势。全生育期耗水量和耗水强度均随土壤湿度的升高而增大，土壤湿度是影响耗水量、耗水强度及水分利用效率的主要因素，而施氮量的影响作用较弱。
To explore the effect of soil moisture and nitrogen application rate on yield, water con- sumption amount and water use efficiency of spring maize, an experiment was conducted by using second-order regression orthogonal design. Precision irrigation and fertilization was adopted in a mobile shed. The results showed that water and nitrogen coupling had a significant effect on maize yield （P〈0.05）. The yield increased firstly and decreased subsequently with increasing the soil moisture and the nitrogen application rate. The yield model showed that the maximum yield reached 15142.5 kg ·hm^-2 when the soil moisture reached 65%-70% of field capacity and the nitrogen application rate was 462 kg ·hm^-2. During the whole growth period, the water consump- tion amount was lowest at the earlier stage, increased slowly at the middle stage and increased rapidly at the grain-filling stage. Overall, the water consumption amount and intensity in the whole growth period increased with the increase of soil moisture. Soil moisture was the main factor influencing water use efficiency, water consumption amount and intensity, while nitrogen applica- tion rate had a weak effect.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第12期3397-3401,共5页
Chinese Journal of Ecology
基金
国家公益性行业(农业)专项(201303125-9)
国家"十二五"科技支撑计划项目(2011BAD16B12
2013BAD07B03
2014213004)资助
关键词
膜下滴灌
春玉米
土壤湿度
施氮量
耦合效应
drip irrigation under film mulching
spring maize
soil moisture
nitrogen applica- tion rate
coupling effect.
