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ID:34046749
大小:1.81 MB
页数:7页
时间:2019-03-03
《双点源滴灌条件下的土壤水分运移特征》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、万方数据第12卷第4期中国水土保持科学V01.12No.42014年8月ScienceofSoilandWaterConservationAug·2014:=:=::=:===========================================双点源滴灌条件下的土壤水分运移特征侯立柱1’2,赵航1(1.中国地质大学(北京)水资源与环境学院,100083,北京;2.中国地质大学(北京)地下水循环与环境演化教育部重点实验室,100083,北京)摘要:通过室内模拟试验,在土槽中埋设TDRl00时域反射仪传感器自动检测土壤含水率、埋设负压计
2、陶土头测定基质势,分析土壤水分运移特征,研究双点源滴灌条件下土壤水分运移规律。结果表明,滴灌点源水分渗入土壤之后,随着距滴头距离的增加,入渗湿润体内的土壤含水率降低,湿润锋交汇界附近的土壤含水率一般均不小于相同土壤深度的含水率;5~35cnl土壤含水率迅速增大到0.315cm3/cm3左右。供水停止后,上层的水分逐渐递减,而下层土壤的水分逐渐增加,且随着时间的延长,水分变化的速率越来越慢。因此,适当灌水量条件下滴灌交汇不会产生深层渗漏,且使用滴灌时作物根系层蓄水保墒效果良好。研究结果可为滴灌方式的适用性、植物选栽提供参考。关键词:滴灌;土壤水分
3、;交汇;湿润锋中图分类号:S152.7;$275.6文献标志码:A文章编号:1672-3007(2014)04-0067-06SoilwatermovementunderinfiltrationofdoublepointsourcedripirrigationHouLizhul一,ZhaoHan91(1.SchoolofWaterResourcesandEnvironment,ChinaUniversityofGeosciences,100083,Beijing,China;2.KeyLaboratoryofGroundwaterCircula
4、tionandEvolution(ChinaUniversityofGeosciences,Beijing),MinistryofEducation,100083,Beijing,China)Abstract:Surfacedripirrigationisthemostadvancedmethodofirrigationtodate,whichenablestheapplicationofappropriateamountsofwatertothesoilthroughdrippers.Studyofsoilwatermovementunder
5、infiltrationofpointsourcedripirrigationplaysanimportantroleinthepromotionofdripirrigationtechnology.Anindoorsoilbinwasdesignedinthisstudy.Timedomainreflectometry(TDRl00)probesandtensiometerswereadoptedtomeasuresoilwatercontentsandsoilwaterpotential,respectively.Theinfiltrati
6、onratesandwettingfrontinterferenceunderdoublepointsourcedripirrigationemitterswereanalyzed.Withthedistanceapartfromdripincreasing,thesoilmoistureofwettedvolumefromdripirrigationwasreduced,andthesoilmoistureofwettedfrontontheintersectionsidewasnotsmallerthanthesoilmoistureofs
7、imilarwetteddepth.Thesoilwatercontent(SWC)of5—35cmlayerreached0.315em3/cm3rapidlyduringtheirrigationphase.Thesoilmoistureofthetoplayergraduallydecreased,thesoilmoistureofsublayersgraduallyincreased,andtherateofchangeofsoilmoisturesloweddownintheredistributionphase.Ourstudywo
8、uldhelpindesigningsurfacedripsystemsforefficientwaterusewithminimumdrainage
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