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时间:2020-03-27
《北方滨海盐碱地冬季咸水结冰灌溉对菊芋生长及离子分布的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2012,31(1):161—165JournalofAgro—EnvironmentScience北方滨海盐碱地冬季咸水结冰灌溉对菊芋生长及离子分布的影响隆小华,倪妮,金善钊,刘兆普+(南京农业大学资源与环境科学学院,南京210095)摘要:为探讨冬季咸水结冰灌溉对河北省滨海平原区盐碱土的土壤盐分变化以及对菊芋生长的影响,在冬季利用地下苦咸水对河北海兴盐碱地进行咸水结冰灌溉试验,设冬灌覆膜处理,其中包括膜上挖孔直接播种处理(T1)和揭膜播种再覆膜处理(T2),以无冬灌+覆膜处理作为第一对照(CKl),不冰灌和不覆膜的小区作为第二对照(CK2o结果表
2、明,冬季灌溉咸水结冰、春季咸水冰融化入渗后土壤各层次脱盐效果明显,播种期T1和12处理的0-5cm、5-20cm表层土壤含盐量较CKI和CK2分别降低了41.9%、65.0%、46.5%、67.7%、29.9%、47.1%,40.8%和55.3%,在菊芋播种期耕层土壤含盐量降低到0.6%左右,T1和他单位产量分别较CKI和CK2高54%、115%、97%和175%,T1和他处理下Na+和cl一含量较CKl和CK2显著降低,而K+含量和K悄a弋皎CKI和CK2显著增高。通过冬季咸水结冰灌溉和覆膜措施可以确保土壤盐分下降,从而降低了盐分对菊芋生长的毒害作用,使菊芋产量得
3、到显著提高。关键词:滨海盐土;土壤盐渍化;咸水结冰灌溉;菊芋中图分类号:S156.4文献标志码:A文章编号:1672—2043(2012)01-0161-05EffectofFreezingSalineWaterIrrigationinWinteronGrowthandIonDistributionofHe//anthUStuberosusL.inNorthCoastalSalineSoilLONGXiao--hua,NINi,JINShan-zhao,LIUZhao-pu+(CollegeofResourcesandEnvironmentalSciencesofN
4、AU,Nanjing210095,China)Abstract:SoilsalinizationandfreshwatershortagesaremajorlimitingfactorsforcropproductionsandenvironmentalrehabilitationincoastalplainsaroundtheBohaiSea.Improvingsalinesoilsinsuchareascangreatlybenefitagriculturalproductionsandenvironmentalpm.teetioninthecontextoff
5、asteconomicdevelopmentacrossthecoastalzonesoftheBohaiSea.Basedonthemechanismofwaterdesalinizationbyfreezingandthawingprocesses,afieldexperimentWasdesignedandconductedtoinvestigatethewaterandsaltdynamicofcoastalsMinesoilwithfreezingsalinewaterirrigationinwinterovercoastalsalinesoilsinHa
6、ixingCounty,HebeiProvince.Atotalof160tonisalinewaterWasappliedtoexperimentalplotsinJanuaryinyear2010,whichWasfrozenwellafterirrigationundertheconditionofalowertemperatureof一9.5℃.Thesoilsurfacewasmulchedwithplasticfilmaftertheinfiltrationofmeltedsalineicewaterinordertopreventsaltaccumul
7、ationin-dueedbyhishevaporationinspring.-11leplotsweredesignedasfollows:irrigationandplantdirectlywithdi鹊ingintoplasticfilmmulchingplotsasT1,irrigationandplasticfilmmulchingplotsasT2,noirrigationandmulchingplotsasCKI,noirrigationandnomulchingplotsasCK2.Inthisexperimentthe皿TuberosusWas
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