河套灌区地下水埋深与总氮浓度交互效应分析
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2020-01-22 13:38:32
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文章编号:1007-4929(2014)07-0042-04河套灌区地下水埋深与总氮浓度交互效应分析孙玲玉,杨树青,李凤军,刘德平,常春龙(内蒙古农业大学水利与土木建筑工程学院,呼和浩特010018)摘要:为了深入了解河套灌区地下水埋深与TN浓度的空间分布规律及相互作用关系,以内蒙古河套灌区乌拉特前旗北场试验区为研究对象,运用GIS软件中反距离加权差值模块对地下水埋深及TN浓度进行插值,绘制并分析了地下水埋深与TN浓度的空间分布图。结果表明,秋浇前地下水埋深达到最大值,平均埋深为2.38m。秋浇后由于大量水渗到地下,地下水埋深达到年内最小值,平均地下水埋深为0.64m;地下水TN浓度总体分布较分散,五水前与秋浇前地下水总氮浓度均值相近,秋浇后略小。秋浇后期试验区西南部的总氮浓度明显偏低,东北部总氮浓度相对较高;试验区地下水埋深与TN浓度相性关系不明显,但地下水埋深的变化可以定性的表征地下水TN浓度的变化。关键词:河套灌区;地下水埋深;总氮;反距离加权插值中图分类号:TV93文献标识码:AAnalysisofInteractionsbetweenGroundwaterDepthandTotalNitrogenConcentrationinHetaoIrrigationDistrictSUNLing-yu,YANGShu-qing,LIFeng-jun,LIUDe-ping,CHANGChun-long(CollegeofWaterConservancyandCivilEngineering,InnerMongoliaAgriculturalUniversity,Huhhot010018,China)Abstract:Inordertohaveadeeperunderstandingaboutthespatialdistributionpatternsandinteractionsbetweengroundwaterdepthandtotalnitrogen(TN)concentrationinHetaoIrrigationDistrict,thispapertookthenorthfieldtestareaofUradFrontBannerinHetaoIrrigationDistrictasanillustrationexample,alongwiththeapplicationofInverseDistanceWeightingmodelinGIStoconductainterpolationcalculationofthegroundwaterdepthandtotalnitrogen(TN)concentration.Besides,thespatialdistributionfiguresofgroundwaterdepthandtotalnitrogen(TN)concentrationweredrewandanalyzed.Theresultsindicatedthatthegroundwaterlevelreachedtothemaximumvalueof2.38mbeforetheautumnirrigation.Whilethelevelturnedouttobetheannualminimumnumberof0.64mbecauseoftheinfluenceofmassiveinfiltrationafterautumnirrigation.However,theoveralldistributionofTNconcentra-tioningroundwatertendedtobedecentralized.ThemeanTNconcentrationingroundwaterpriortothefifthirrigationandautumnirrigationwereclosetoeachother,whichwassmalleraftertheautumnirrigation.TheTNconcentrationinthesouthwestpartoftestareawassignificantlylowerthanotherplacesaftertheautumnirrigation.Onthecontrary,ittendedtobelargerinthenortheastpart.Finally,therelationshipbetweengroundwaterdepthandtotalnitrogen(TN)concentrationinthetestareawasnotobvious,whilethetotalnitrogen(TN)concentrationingroundwaterco
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