排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (2): 237-243    DOI: 10.3969/j.issn.1674-8530.2012.02.022
农业水土工程 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
多点源滴灌条件下土壤水分运移模拟试验研究
 张林, 吴普特, 朱德兰, 范兴科

(西北农林科技大学中国旱区节水农业研究院, 陕西 杨凌 712100)
Simulation experiments on soil water movement in multiple point sources drip irrigation
 ZHANG  Lin, WU  Pu-Te, ZHU  De-Lan, FAN  Xing-Ke

(Institute of Water Saving Agriculture in Arid Regions of China, Northwest A & F University, Yangling, Shaanxi 712100, China)
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摘要 为了指导密植作物的滴灌系统合理设计,通过室内物理试验模拟了多点源滴灌条件下土壤水分运移过程,重点研究了不同滴头流量下交汇湿润体内的土壤水分时空动态分布规律.多点源滴灌条件下土壤水分运动遵循先点源入渗、再湿润锋交汇和最后形成湿润带的规律.灌水结束时,土壤水分分布呈现湿润体上部复杂、下部相对简单的特征.湿润体上部,在滴头下方存在土壤含水率相对较高的区域,2个滴头之间近地表处存在土壤含水率相对较低的区域;湿润体下部同一深度土层上的含水率有趋于一致的趋势.灌水结束后,由于土壤水分再分布,同一深度土层上含水率差异逐渐减小.灌水量相同条件下,灌水结束时,滴头流量小的入渗深度较大,湿润体内土壤平均含水率较低;灌水结束后,受土壤水分再分配的作用,不同滴头流量下入渗深度的差异较灌水结束时有所减小.
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张林
吴普特
朱德兰
范兴科
关键词土壤水分运动   滴灌   滴头流量   土壤含水率   多点源     
Abstract: In order to provide a guide to reasonable design of drip irrigation system for closegrown crops, soil water movement in drip irrigation of multiple point sources was simulated by indoor physical experiment.The spatialtemporal dynamic distribution of soil water was mainly studied under different emitter discharge rates.There were three stages in the infiltration, namely, point source infiltration, overlapped wetting front and wetting belt.The characters of soil water distribution were complex in the upper zone and relatively simple in the lower zone in the wetted volume.In the upper zone of wetted volume, there was a region with higher soil water content under the emitter and a zone with lower water content near the surface between two emitters.The soil water content tended to be uniform on the same layer in the lower zone of wetted volume.After the end of irrigation,difference in water content on the same layer in the wetted soil was decreased due to soil water redistribution.Compared to a higher emitter discharge, the infiltration depth was deeper and the average soil water content was lower at a smaller discharge at the end of irrigation for the same irrigation amount.After the irrigation was completed, the difference in infiltration depth was slight for different emitter discharges due to soil water redistribution.
Key words soil water movement   drip irrigation   emitter discharge   soil water content   multiple point sources   
收稿日期: 2011-09-29; 出版日期: 2012-03-30
基金资助:

 “十二五”国家科技支撑计划项目(2011BAD29B02); 教育部、国家外国专家局“111”计划项目(B12007); 西北农林科技大学农业科技创新专项(CX200909)

通讯作者: 张林(1981—),男,湖北随州人,博士后(zl0211wy@163.com),主要从事节水灌溉理论与设备研究.   
作者简介: 吴普特(1963—),男,陕西武功人,研究员,博士生导师(通信作者,gjzwpt@vip.sina.com),主要从事水资源高效利用研究.
引用本文:   
张林,吴普特,朱德兰等. 多点源滴灌条件下土壤水分运移模拟试验研究[J]. 排灌机械工程学报, 2012, 30(2): 237-243.
ZHANG Lin,WU Pu-Te,ZHU De-Lan et al. Simulation experiments on soil water movement in multiple point sources drip irrigation[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(2): 237-243.
 
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