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ID:34023894
大小:6.64 MB
页数:93页
时间:2019-03-03
《不同因素对微咸水膜孔灌水氮盐运移影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据河北工程大学硕士学位论文肥液浓度越大,相同时间下的累积入渗量和湿润锋运移距离越大;入渗结束后,不同肥液浓度的土壤含水量和硝态氮含量均随着距膜孔距离的增大而减小,在相同入渗时间下,随着肥液浓度的增大,相同位置上的土壤含水量先减小后增大再减小,相同位置上的土壤硝态氮含量越大;不同肥液浓度的土壤含盐量均随着距膜孔距离的增大而逐渐增大,在相同入渗时间下,随着肥液浓度的增大,相同位置上的土壤含盐量先先增大后减小。微咸水矿化度越大,相同时间下的累积入渗量和湿润锋运移距离越大;入渗结束后,不同微咸水矿化度的土壤含水量和硝态氮含量均随着距膜
2、孔距离的增大而逐渐减小,在相同灌水时间下,微成水矿化度越大,楣同位置上的土壤含水量和硝态氮含量越大,不同微咸水矿化度的土壤含盐量均随着距膜孔距离的增大而逐渐增大,在相同入渗时间下,随着微成水矿化度的增大,相同位置上的土壤含盐量先增大后减小再增大。以上研究成果可为开展利用微咸水通过膜孔灌的灌溉方式对农田进行灌溉提供理论依据,为进一步开展农田高效灌溉、节水施肥奠定科学基础。关键字:微咸水膜孔灌;土壤初始含水量;土壤容重;膜孔直径;钠吸附比:肥液浓度;微威水矿化度万方数据AbstractBasedonsummarizingandanaly
3、zingthedomesticandfilmholeirrigationandmicroirrigationwithbrackishwatertheoryandtechnologyresearch,technicalroutebyindoorexperimentsandtheoreticalanalysisofthecombination,mainlystudiedtheeffectsofsoil,filmholediameter,brackishwatersolutionandotherfactors。nfilmholeirrig
4、ation,nitrogen,soilwatersalttransportcharacteristics.Themainresearchresultsareasfollows:1,tostudysoilfactorsfreeintotheeffectsofwaterandnitrogensaltmigrationanddistributionaftertheinfiltrationoffilmholeirrigationofbrackishwater.Thesoilfactorsinclude:thetwofactorsofinit
5、ialsoilwatercontentandsoilbulkdensity.Theinitialsoilmoistureincreased,atthesametimethecumulativeinfiltrationandwettingfronttransportdistancelarger;afterinfiltration,differentinitialwatercontentofsoilmoistureandnitratenitrogencontentwereincreasedwiththedistancefromthefi
6、lmholedecreasesgradually,inthesameinfiltrationtime.initialsoilwarercontentthegreaterthesamelocation,soilmoistureincreased,thenitrogencontentinthesamepositionofsoilnitratedecreasedfirstandthenincreased;soilsaltcontentofdifferentinitialmoisturecontentdecreasedwiththeincr
7、easeofthedistancefromthemembraneporesandincreasegradually,inthesameinfiltrationtime,alongwiththeincreaseofinitialsoilwatercontent,thesamepositionthesoilsaltcontentdecreasesfirstandthenincreases.Soilbulkdensityisbigger,atthesametimethecumulativeinfiltrationandwettingfro
8、nttransportdistanceissmall;afterinfiltrationofdifferentsoilbulkdensity,soilmoistureandnitratenitrogencontentdecreased
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