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时间:2020-04-17
《玉米株型和幅宽对套作大豆碳氮代谢及产量的影响-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、中国油料作物学报2014,36(2):206—212ChineseJournalofOilCropSciencesdoi:10.7505/j.issn.1007—9084.2014.02.010玉米株型和幅宽对套作大豆碳氮代谢及产量的影响王竹,杨文钰(1.成都农业科技职业学院,四JiI成都,611130;2.四川农业大学农学院,四川雅安,625014)摘要:在玉米/大豆套作模式下,采用玉米株型与种植幅宽二因素裂区设计,研究了不同田间配置对套作大豆碳氮代谢与产量的影响。结果表明,较大幅宽和紧凑型玉米下,大豆被荫蔽的程度有所减缓,碳氮代谢变化趋势朝着利于产量形成的方向发展。主要表现为,
2、茎叶中的碳氮含量和关健酶在各时期保持在较高的水平;R4期后叶片中的淀粉迅速降解为糖运至籽粒,而氮的下降速率缓慢。结合前期的研究,我们得出,R2是大豆经历光照转换的重要时期,该时期植株的碳氮代谢能力对大豆后期产量的形成起着重要的作用。而R6期大豆表现出来的碳、氮代谢水平,又能一定程度反映产量水平。本试验条件下,对玉米、大豆两季作物的经济效益进行分析后得出,利于大豆生长,且保证全年高产、高效的最优组合为:与紧凑型玉米套作,大豆幅宽1.17m,玉米幅宽0.83m。关键词:套作大豆;玉米株型;幅宽;碳氮代谢;产量中图分类号:$565.1,$344.3文献标识码:A文章编号:1007—908
3、4(2014)02—0206—07Efectsofplant——typesofmaizeandplantingwidthoncarbon——nitrogenmetabolismandyieldofrelay——croppingsoybeanWANGZhu.YANGWen—yu(1.ChengduVocationalCollegeofAgriculturalScienceandTechnology,Chengdu611130,China;2.CollegeofAgronomy,SichuanAgriculturalUniversity,Ya’an625014,China)Abstra
4、ct:Fieldexperimentswereconductedtodeterminetheoptimalfieldcombinationthatbenefitedsoybeancarbon—nitrogenmetabolismandyieldin“maize/soybean”relay—croppingsystem.Splitplotdesignwasadopt—ed,withdifferentplant—typesofmaizeasmainplots,plantingwidthassub—plots.Theresultsshowedthatunderlargewidthandr
5、elaycroppingwitherectmaize,shadedamagetosoybeanwasreduced.Thetrendofsoybeancar—bon—nitrogenmetabolismwasbeneficialtohighyield.ThecontentofcarbonandnitrogenandtheactivityofSPSandGSkeptatahighlevelateverygrowingstage.AfterR4,thestarchinleafdegradedintosugarquicklyandtransferredtograin,andthedecr
6、easingrateofnitrogensloweddown.Basisonourpreviousresearchwork,there—sultsuggustedthatR2wasthecrucialstageforsoybeantoexperiencelightchange(maizeharvesttimewasaroundR2),SOthecarbon—nitrogenmetabolismabilityofsoybeanatR2hadastrongimpactforyield.Andthecarbon—nitrogenmetabolismlevelsofsoybeanatR6c
7、ouldpartlyreflectyield.Inconclusion,relay—croppingsoybeanwitherectmaizeinplantingwidth1.17m/0.83m(soybean/maize)wasthebestfieldcombinationthatcouldensurehighyieldandeficiencyallyearround.Keywords:Relay—croppingsoybean;Maizeplant—type;Pl
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