模拟水旱轮作条件下土壤磷素含量对秸秆还田的响应及变化规律

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关键词：土壤磷素；有效磷；秸秆还田；水旱轮作；Hedley法

中图分类号： S151.9+3;S157.4+2 文献标识码：A

文章编号：0439-8114（2025）06-0039-06

DOI：10.14088/j.cnki.issn0439-8114.2025.06.008 开放科学（资源服务）标识码（OSID）：口

Response and dynamics of soil phosphorus to straw incorporation under simulated paddy-upland rotation conditions

ZHAO Xi-mei1，PEI Xiao-min 2 ，LIAo-ming-yang1，LIU Tian-ya1，ZHANG Zheng1，LIMeng-die 1 ，LI Ji-fu1 （1.Collegeflalstigtealdotsigu China；2.Jingzhou Agricultural Technology and Promotion Service Center，Jingzhou 43402O，Hubei， China）

Abstract：Toinvestigatetheefectsof traw incorporationonsoil phosphorus dynamicsunderpddy-uplandrotationsystems，soil samplesfromlong-termrice-rapesedrotationexperimentalfieldswerecollctedforidoorsimulationexperimentsFourreatments were established：uplandcropping（D），paddycropping（W），uplandcropping+straw incorporation（D+S），and paddycroppng+ strawincorporation（W+S）.Soilphosphorusfractions wereextractedandquantifiedusing the Hedleyphosphorus fractionationmethod，andthesoilavailablephosphorusvariations wereobservedTheresultsshowed thatunderuplandconditions，strawincorporation increased soil available phosphorus by 20.6% ，while under paddy conditions，it enhanced available phosphorus by 56.4%.Overall， available phosphorus contentimprovement was more pronouncedunderpaddycroppingthanunderupland cropping.Comprehensive analysisindicatedthatthe W+Streatment mostefectivelyenhancedsoilavailablephosphorus.Redundancyanalysis（RDA）revealed that water regime and straw incorporation contributed 73.2% and 26.8% ，respectively，to soil phosphorus variations.Straw incorporation notnlyelevatedavailablephosphorusbutalsoregulatedphosphorusspeciation，therebyenhancingsoilphosphorussupplycapacity. Key words：soil phosphorus；available phosphorus；straw incorporation；paddy-upland rotation； Hedley method

磷是作物生长的必需营养元素。（剩余10406字）