摘要
【目的】测试新研发的作物主动式土壤水分平稳供应装置性能。【方法】设置了不同控压水平的土槽试验,测定和分析了该装置的控制负压能力和土壤湿润锋运移特性。【结果】(1)该装置可通过调整负压控制装置的数量和控压粗管内水柱高度将土壤负压控制在目标值附近,在-15 k Pa以内的控制压力下,负压变幅极小。(2)该装置供水条件下,土壤水分的横向运移要强于垂向运移,但土壤湿润范围随负压控制装置数量的增多而减小;土壤湿润锋横向推进距离与灌水历时呈很好的幂函数关系,且随着负压控制装置数量的增多,土壤水分横向运移速度变慢。【结论】该装置可以实现对水分的连续自动获取,有望用于作物灌溉之中。
[Objective] Based on the soil suction, a new type of soil moisture supply device, in which crops play the active role, was developed and its performance need to be clear. [Method] In this paper, the soil-tank test with different control pressure levels was set up, and the control negative pressure and soil wetting front migration were measured. [Result] ①The device could control the soil pressure in the vicinity of the target value by adjusting the number of negative pressure control device and the water column height in the thick water pipe. The negative pressure amplitude was very small within the control pressure of- 15 kPa. ②Supplying water with this device, the lateral movement of soil moisture was stronger than that of vertical migration, but the soil wetting range decreased with the increase of the number of negative pressure control devices. The lateral wetting distance of soil had a good power function to irrigation duration, and with the increase of the number of negative pressure control device, the lateral migration speed of soil moisture slowed down. [Conclusion] The device can achieve continuous acquisition of moisture automatically, and may be expected to be used for crop irrigation.
出处
《灌溉排水学报》
CSCD
北大核心
2018年第3期84-89,共6页
Journal of Irrigation and Drainage
基金
国家863计划资助项目(2013AA102901)
中国农业科学院科技创新工程团队农田灌溉研究所"节水高效灌溉技术与装备"项目
关键词
土壤吸力
负压灌溉
负压控制装置
土壤湿润锋
soil suction
negative pressure irrigation
negative pressure control device
soil wetting front