不同氧浓度下灌溉系统中溶解氧变化规律  

Variation of dissolved oxygen concentration in drip irrigation system at different oxygation concentrations

作　　者：饶晓娟[1,2,3] 王治国 付彦博[2] 孟阿静[2] 冯耀祖[2] 蒋平安[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,新疆乌鲁木齐830052 [2]新疆农业科学院土壤肥料与农业节水研究所,新疆乌鲁木齐830091 [3]新疆农业职业技术学院生物科技学院,新疆昌吉831100

出　　处：《排灌机械工程学报》2017年第11期981-986,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(41261076;51169025);西部特色作物科技信息服务互动平台构建与示范项目(2014BAD10B01);新疆农业职业技术学院资助项目(XJNZYKJ2016025)

摘　　要：为研究不同浓度增氧灌溉水在灌溉系统中的衰变规律,设计4个氧气浓度,CK为常规井水不充气增氧、O_2(21%)为空气充气增氧、O_2(30%)为氧气浓度30%进行充气增氧和O2(50%)为氧气浓度50%进行充气增氧,通过微纳米气泡发生装置对灌溉水进行增氧,制备不同溶解氧浓度的灌溉水,进行加压注入灌溉系统中,研究增氧灌溉水在灌溉系统中的衰变规律.研究表明:随着充氧浓度的增加可以显著提高灌溉水溶解氧浓度,管道水溶解氧浓度随着距离的增加呈递减趋势,并随着灌溉水溶解氧浓度的增加衰减速率增加;滴头流量为1.38 L/h比3.20L/h的灌溉水溶解氧浓度低,并随着溶解氧浓度增加和滴灌带距离的延长这种降低趋势有所增加.综上表明:灌溉水在加压灌溉系统中溶解氧浓度都会降低,并且随着距离和时间的增加灌溉水溶解氧会逐渐降低,高溶解氧浓度的灌溉水溶解氧浓度降低幅度大于低溶解氧浓度的灌溉水,在管道系统和滴灌带中表现出相同的趋势;滴灌带滴头流量不同,对灌溉水溶解氧浓度影响不同,滴头流量为1.38 L/h比3.20 L/h灌溉水溶解氧浓度降低得多.To study decay rate of dissolved oxygen at different oxygen concentrations in an irrigation system and provide a guide for technology of oxygation in mulch drip irrigation,irrigation water was aerated by using micro-nano bubble generating device and then injected into the irrigation system at ahigher pressure. There were four oxygation concentrations,non O_2（ CK,no aeration）,21% O_2（ air aeration）,30% O_2（ oxygen aeration） and 50% O_2（ oxygen aeration）. The results show that the dissolved oxygen concentration in irrigation water rises significantly with increasing oxygation concentration,and decreases along the irrigation pipe,and the decay rate of dissolved oxygen increases with increasing oxygation concentration. The dissolved oxygen concentration in irrigation water at 1. 38 L/h flow rate is lower than that at 3. 20 L/h,the reduction in dissolved oxygen concentration gets large with increasing oxygation concentration and drip irrigation belt length. The lower the dripper flow rate,the more decreasing the dissolved oxygen concentration in irrigation water. A different dripper flow rate can result in a different dissolved oxygen concentration. The dissolved oxygen concentration in irrigation water at 1. 38 L/h flow rate is much lower than that at 3. 20 L/h.

关 键 词：灌溉系统 溶解氧衰变 增氧灌溉 滴头流量 管距 

分 类 号：S274.3[农业科学—农业水土工程]