摘要
试验主要研究了华北半湿润地区微咸水滴灌条件下,滴头正下方0.2 m深度土壤基质势分别控制在-10^-50kPa时,不同盐分浓度微咸水(2.2~4.9 dS/m)对黄瓜产量、灌水量及灌溉水利用效率(IWUE)的影响。研究发现当灌溉水电导率(EC)大于1.1 dS/m时,黄瓜的产量随着EC的增大而降低。当滴头下0.2 m深度土壤基质势控制在-25^-35kPa时,黄瓜表现出来的耐盐性最强,EC每升高1 dS/m产量大约降低3%。总的趋势是土壤基质势控制越高(-10 kPa)处理的灌溉量越多,IWUE越低,而土壤基质势控制越低(-50 kPa)处理的灌溉量越少,IWUE越高。通过研究,在年降雨量大约为600 mm的半湿润地区,当没有足够的淡水用于作物灌溉时,可以在采用一系列灌溉与栽培管理措施条件下,利用2.2~4.9 dS/m的微咸水来灌溉黄瓜等对盐分中等敏感的作物。
The experiment was corducted to investigate mainly the effects of saline water （EC =2.2-4.9 dS/m） on cucumber yield, irrigation quantity and irrigation water use efficiency （IWUE） under drip irrigation in North China Plain, when the soil matric potential（SMP） at 0.2 m depth immediately under drip emitter was controlled from -10 to -50 kPa. The experiment results indicated when irrigation water salinity （ECi） was greater than 1.1 dS/m, cucumber yield decreased with the increasing of ECi. When the SMP at 0. 2 m depth immediately under drip emitter was controlled between -25 and -35 kPa, cucumber showed the most resistant to salinity, and cucumber yield decreased about 3%/ for 1 dS/m increase of ECi. When the treatment with a higher SMP （-10 kPa）, the irrigation quantity was more, and the IWUE was lower; whereas the treatment with a lower SMP（-50 kPa）, the irrigation quantity was less, and the IWUE was higher. As can be known from this study, in the semi-humid regions with annual precipitation about 600 mm where no enough fresh water is available for irrigation, 2.2-4.9 dS/m saline water can be used by drip irrigation to irrigate crops such as cucumber, the moderate salinity susceptible crop, after several proper agronomic practices and water management strategies are taken.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第3期30-35,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院知识创新工程项目(KSCX2-YW-N-003)
中国科学院百人计划
天津市科技发展计划项目(05YFGZNC01000与06YFGZNC00100)
关键词
微咸水
滴灌
黄瓜
产量
灌溉水利用效率
saline water
drip irrigation
cucumber
yield
irrigation water use efficiency
作者简介
万书勤（1978-），女，江西南昌人，助理研究员，主要从事农田水循环与农业水资源高效利用方面的研究。北京朝阳区安外大屯路甲11号中科院地理科学与资源研究所，100101。Email：wansq@igsnrr．ac．cn
