欢迎来到天天文库
浏览记录
ID:53568588
大小:770.46 KB
页数:11页
时间:2020-04-18
《甘薯套作对土壤氮素含量及氮素转移的影响-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、作物学报ACTAAGRONOMICASINICA2012,38(1):148—158http://www.chinacrops.org/zwxb/ISSNO496—3490;CODENTSHPA9E—mail:xbzw@chinajourna1.net.cnD0I:10.3724/SP.J.1006.2012.00148小麦/玉米/大豆和小麦/玉米/甘薯套作对土壤氮素含量及氮素转移的影响雍太文杨文钰向达兵万燕刘卫国王小春四jiI农业大学农学院,四川温江611130摘要:为探讨小麦/玉米/大豆套作对氮素营养的种间促进机制,采用叶片N富积标记法研究TsJ,麦
2、/玉米,大豆(A1)和小麦/玉米/甘薯(A2)2种套作系统中不同施氮水平下的土壤培肥效果和氮素转移规律。结果表明,施氮可以提高小麦、玉米的土壤总氮含量,以施纯氮150~300kghm_2处理最高;大豆较甘薯更有利于保持土壤肥力,施氮0、150、300和450kghm-水平下种植大豆后的土壤总氮含量比种植大豆前(小麦收获后)高38.6%、20.2%、9.4%和16.7%.而种植甘薯则降低总氮含量3.1%、1.8%、14.0%和3.8%。A1系统中小麦和玉米季土壤中NO3一N含量低于A2系统,且随施氮量的增加而增加;大豆季土壤中NO3N含量高于甘薯季。A1和
3、A2系统均存在N的双向转移,N转移量随施氮量的增加而降低,且A1的N净转移量和转移强度高于A2;A1系统中小麦、玉米和大豆的巧N净转移量比A2系统的N净转移量分别高3.3%~12.1%、27.0%一166.2%和26.2%一78.7%。玉米与小麦之间的N净转移方向为从玉米向小麦,玉米与大豆之间的N净转移方向为从大豆向玉米,玉米与甘薯之间的N净转移方向为从玉米向甘薯。关键词:小麦/玉米/大豆;套作;土壤氮素;氮素转移;N富积标记法EffectofWheat/Maize/SoybeanandWheat/Maize/SweetPotatoRelayStripI
4、ntercroppingonSoilNitrogenContentandNitrogenTransferY0NGTaiWen,YANGWen.Yu‘XIANGDa—Bing,WANYan,LIUWei—Gno,andWANGXiao—ChunCollegeofAgronomy,SichuanAgriculturalUniversity,Wenjiang61l130.ChinaAbstract:Theaimofthisstudywastocharacterizenitrogentransferintherelaystripintercroppingsyst
5、emofwheat/maize/soybean,andtoinvestigatetheNpromotionmechanism.ApotexperimentwasconductedtodeterminethesoilNcontentandtransferintherelaystripintercroppingofwheat/maize/soybeanandwheat/maize/sweetpotatousingthedirect”Nfoliarfeedingtechnique.TheNapplicationrateswere0,150,300,and450
6、h.T
7、leresultsshowedthatNapplicationincreasedthesoiltotalNcontentsinwheatandmaizeseasons.ThetotalNcontentofsoilreducedwhenNappliedinanexcessiverate,andthehighestvaluesofsoiltotalNcontentappearedattheNrateof150-300kgh.Moreover,thesoiltotalNcontentsinwheatandmaizeseasonsintherelayst
8、ripintercroppingofwheat/maize/soybeanwerehigherthanthoseinthewheat/maize/sweetpotatosystem.Aftersoybcanplantedintherelaystripintercropping,thesoiltotalNcontentsincreasedby38.6%,20.2%,9.4%,and16.7%atappliedNratesof0,150,300,and450ha一,respectively.Whereasaftersweetpotatoplanted,the
9、ywerereducedby3.1%,1.8%,l4.0%。and3.8%,re
此文档下载收益归作者所有