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《不同耕作方式下稻草分解與養(yǎng)分釋放特點(diǎn)與對(duì)水稻氮素利用的影響》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、DecompositionandReleaseCharacteristicsofIncorporatedRiceStrawandInfluenceonNitrogenUseinRiceunderDifferentTillagePatternsLiuKaiqiang(CollegeofAgriculture，GuangxiUniversity，Nanning530005，China)AbstractTherewouldbeabigdifferenceofstrawdecompositionandn
2、utritionreleasebetweenno—tillageandconventionaltillage．ThereforefieldandspotexperimentswereconductedtostudythedecompositionandreleasecharactersofincorporatedstrawunderdifferenttillagepatterswithJinyou253in2006and2007．Atthesametime，15Ntracermethodwasu
3、sedtoquantifythefateofnitrogenfromincorporatedstraw．Theresultswereshowedbelow：Themaincomponentsofstrawaresemi—cellulose，cellulose，andlignin，withthecontentsof41．42％，31．28％and6．20％respectively．Theresidueofsemi-celluloseandcellulosewitlltheaveragedecomp
4、ositionratesofO．35g。d-1andO．27g．d-1，decreasedsharplyfrom0to10days，andbecamegentlyfrom25to40daysafterreturning．Theaveragedecompositionrateofligninwas0．034g。d-1，whichlessthansemi-celluloseandcellulose．TillagepaRemsplayeddifferentpartsonthedecomposition
5、ofdifferentstrawcomponents．Ithadhighdecompositionratesandlowerresidueofsemi-celluloseandIVcelluloseunderno·tillage，butitwasnottrueforlignin．Potassiumreleasedquicklyinthefirst10daysafterreturning，andthenbecamegently．Nitrogenshowedahigherdecompositionr
6、ateduring0tol0or40to70daysafterreturningand0to10daysforphosphorus，25to40daysforSi．Ithadhigherdecompositionratesofnitrogen，phosphorusandSiO一100daysafterreturningunderno—tillagepatterns，exceptpotassium．Leafofricestrawcontainsmorenitrogen，Si，ligninandle
7、sscellulose，potassiumthanstem．Sotheremustbegreatdifferencebetweendecompositionratesofleafandstem．Resultsindicatedthatleafhadhighdecompositionratesofsemi-cellulose，lignin，andlowerdecompositionrateofcellulose，potassiumthanstem．Alsoithadhigherdecomposit
8、ionratesofsemi—cellulose，cellulose，ligninfrom0to15daysafterreturningand0to15，30t045daysfornitrogenandphosphorus，45to60daysforSi．Theresidueofsemi—cellulose，cellulose，ligninandnitrogeninleafwerelowerthanstemby41．43％，84．66％，23．26％and17．71％respectively．I
