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1、Plant,CellandEnvironment(2011)doi:10.1111/j.1365-3040.2011.02403.xDinitrogen-fixingAcaciaspeciesfromphosphorus-impoverishedsoilsresorbleafphosphorusefficientlypce_24031..HONGHUAHE,TIMM.BLEBY,ERIKJ.VENEKLAAS&HANSLAMBERSSchoolofPlantBiology,TheUniversityofWesternAustralia,Crawley,WA6009,Austr
2、aliaKeywords:·desertshrub;·legume;·N2-fixation;·N:Pratio;·soilnutrientpatchinessABSTRACTNitrogen(N)andphosphorus(P)resorptionfromsenescingleaveswerestudied,andthecontributionofNandPcyclingthroughlitterfalltosoilnutrientpatchinesswasinvestigatedforfourAcaciaspeciesintheGreatSandyDesertinnort
3、h-westernAustralia.NandPconcentrationsofmatureandrecentlyshedleaveswereanalysedandcompared;soilsunderthecanopiesoftheshrubsandsoilsingaps(openareas)betweentheshrubswerealsoanalysedandcomparedforNandPconcentrations.MatureleafPconcentrationsoftheplantswereconsiderablylowerthantheglobalaverage
4、values,andN:Pratiosofmatureleaveswerehigh.Plantsderived0–75%oftheirleafNfromsymbioticN2-fixation.N-resorptionefficiencywasbetween0and43%,andP-resorptionefficiencywasbetween32and79%;allplantsweremoreefficientatPresorptionthanatNresorption,andlitterN:Pratiosweresignificantlyhigherthanmaturele
5、afN:Pratios.SoilsofthestudysiteswereP-impoverished.TotalsoilNandPconcentrationswerehigherunderthecanopythaningaps,butbicarbonate-extractablePconcentrationwashigheringaps.Nutrientcyclingthroughlitterfallresultsinsoilnutrientpatchinessandforms‘islandsoffertility’underthecanopiesoftheshrubs.
