不同耕作方式下稻草分解与养分释放特点与对水稻氮素利用的影响

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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