摘要
试验研究喷灌对农田小气候的影响结果表明 ,喷灌影响灌水当时冠层附近空气温度与湿度 ,且整个喷灌周期均对其产生影响。喷灌作物冠层上方出现的逆温时间较长 ,冠层附近温度较低且湿度较大。喷灌地表温度日变幅明显小于地面灌处理且随土层深度的增加 2种灌水处理地温日变幅迅速减小。喷灌和地面灌处理冬小麦全生育期总耗水量分别为 43 6.5mm和 459.4mm ,产量分别为 643 0kg/hm2 和 4455kg/hm2 ,水分利用效率分别为1.47kg/m3 和 0 .97kg/m3 ,喷灌比地面灌水分利用效率高 52 %。
The experiment of the effects of sprinkler irrigation on the field microclimate shows that sprinkler irrigation affects the air temperat ure and humidity near crop canopy not only at the sprinkler day but also during the whole sprinkler irrigation season. The air temperature inversion appears for a very long time, the air temperature is decreased sharply, and the vapor press ure within heights from 1m to 4m is significantly increased near canopy under s pr i nkler irrigation condition. Daily soil temperature amplitude under sprinkler irr igation condition is smaller than that under surface irrigation condition at gro und surface. The temperature amplitude decreases sharply as depth increases unde r both sprinkler irrigation and surface irrigation conditions. Total water uses during winter wheat growing period are 436.5mm and 459.4 mm under both sprinkle r irrigation and surface irrigation conditions, respectively. However, the winter wheat yield under sprinkler irrigation is 6430kg/hm 2, and 4455kg/hm 2 under s urface irrigation condition. The water use efficiency (WUE) of winter wheat on the field under sprinkler irrigation condition is 1.47kg/m 3 while it is 0. 97 kg/m 3 under surface irrigation condition. WUE under sprinkler irrigatio n condition is about 52% higher than that under surface irrigation condition.
出处
《中国生态农业学报》
CAS
CSCD
2003年第4期103-107,共5页
Chinese Journal of Eco-Agriculture
基金
国家杰出青年科学基金项目 ( 40 1 2 50 0 2 )部分研究内容
