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时间:2020-05-20
《连续免耕对不同质地稻田土壤理化性质的影响-论文.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、第34卷第2期生态学报Vo1.34,No.22014年1月ACTAECOLOGICASINICAJan.,2014DOI:10.5846/stxb201303190451龚冬琴,吕军.连续免耕对不同质地稻田土壤理化性质的影响.生态学报,2014,34(2):239.246.GongDQ,LtiJ.Effectsofs。iItextureonvariationsofpaddys。ilphysicalandchemicalpropertiesundercontinuousDOtillage.ActaEcologicaSinion201434(2):239—
2、246.连续免耕对不同质地稻田土壤理化性质的影响龚冬琴,吕军,。,(1.浙江大学环境与资源学院,杭州310058;2.浙江大学教育部污染环境修复与生态健康重点实验室,杭州3100583.浙江省亚热带土壤与植物营养重点实验室,杭州310058)摘要:以我国南方地区典型的单季水稻生产大田为研究对象,按土壤质地分为壤质和粘质两个系列,探讨不同质地稻田土壤理化性质变化对连续免耕的响应规律。结果表明,在无秸秆覆盖条件下,随着免耕年限的增加,壤质和粘质稻田土壤的耕层均有紧实度提高的趋势,特别是粘质土壤,导致耕层变浅。与常年翻耕土壤相比,免耕6a后壤质水稻土0—20
3、cm土层的紧实度值平均增加了32%,而粘质的平均增加了90%。在相同免耕年限条件下粘质稻田土壤容重的增加也比壤质土壤的明显。壤质土壤0—10cm土层有机质和碱解氮含量随免耕年限延长而提高,而在粘质土壤则显著降低。无论是壤质还是粘质土壤,连续免耕多年后土壤速效磷均在耕层(0—20cm)富集,而速效钾则相反。总体而言,壤质水稻土对免耕的适宜性要优于粘质土壤;应根据土壤质地的不同选择性地实施免耕技术,并结合秸秆覆盖,以实现免耕稻田土壤的可持续利用。关键词:土壤质地;免耕;土壤理化性质;稻田Efectsofsoiltextureonvariationsofpa
4、ddysoilphysicalandchemicalpropertiesundercontinuousnotillageGONGDongqin一.L0Jun,,1CollegeofEnvironmentalScienceandNaturalResources,Zh~iangUniversity,Hangzhou310058,China2KeyLaboratoryofEnvironmentalRemediationandEcologicalHealth,Min~tryofEducation,ZhejiangUniversity,Hangzhou31005
5、8,China3ZhqiangProvincialKeyLaboratoryofSubtropicalSoiandPlantNutrition,ZhefiangUnivemi~,Hangzhou310058.c矗n0Abstract:Asoneofsoilconservationtillagemethods,notillage(NT)hasbeenwidelyappliedinfarmlandsworldwide.Duetothecombinedeffectofsoiltype,croplandecologicalconditionandcroppin
6、gsystemtype,thereisstillongoingdebateconcerningthepositiveversusnegativeeffectofNTonpaddysoilproperties.Althoughsoiltexturehasbeenrecognizedasoneofimportantfactorsincharacterizingsoilpropertyvariationinresponsetodifferentmanagementpractices,fewattemptshavebeenperformedtoaddresse
7、ffectsoftillagemethodonsoilpropertyconsideringthedifferenceinsoiltextures.SucheffortwillbebeneficialtoexplaintheongoingdebateandimproveourknowledgeontheeffectofNTonsoilproperty.Inthisstudy,effectsofsoiltexture(i.e.,loamandclay)onthevariationsofsoilphysicalandchemicalpropertiesin
8、responsetocontinuousNTwereaddressedforthesingle
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