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1、AnUncertainFutureforSoilCarbonSusanE.TrumboreandClaudiaI.CzimczikScience321,1455(2008);DOI:10.1126/science.1160232Thiscopyisforyourpersonal,non-commercialuseonly.Ifyouwishtodistributethisarticletoothers,youcanorderhigh-qualitycopiesforyourcolleagues,clients,orcust
2、omersbyclickinghere.Permissiontorepublishorrepurposearticlesorportionsofarticlescanbeobtainedbyfollowingtheguidelineshere.Thefollowingresourcesrelatedtothisarticleareavailableonlineatwww.sciencemag.org(thisinformationiscurrentasofJanuary1,2013):Updatedinformationa
3、ndservices,includinghigh-resolutionfigures,canbefoundintheonlineonJanuary1,2013versionofthisarticleat:http://www.sciencemag.org/content/321/5895/1455.full.htmlAlistofselectedadditionalarticlesontheScienceWebsitesrelatedtothisarticlecanbefoundat:http://www.sciencem
4、ag.org/content/321/5895/1455.full.html#relatedThisarticlecites16articles,2ofwhichcanbeaccessedfree:http://www.sciencemag.org/content/321/5895/1455.full.html#ref-list-1www.sciencemag.orgThisarticlehasbeencitedby5article(s)ontheISIWebofScienceThisarticlehasbeencited
5、by5articleshostedbyHighWirePress;see:http://www.sciencemag.org/content/321/5895/1455.full.html#related-urlsThisarticleappearsinthefollowingsubjectcollections:AtmosphericSciencehttp://www.sciencemag.org/cgi/collection/atmosDownloadedfromScience(printISSN0036-8075;o
6、nlineISSN1095-9203)ispublishedweekly,exceptthelastweekinDecember,bytheAmericanAssociationfortheAdvancementofScience,1200NewYorkAvenueNW,Washington,DC20005.Copyright2008bytheAmericanAssociationfortheAdvancementofScience;allrightsreserved.ThetitleScienceisaregistere
7、dtrademarkofAAAS.PERSPECTIVESReferencesneitherecosystemsnorregolithattainsteadyfixednitrogenintoterrestrialecosystems1.B.H.Wilkinson,B.J.McElroy,GSABull.119,140state;rather,theyvarytogetherasaresultofaboveprehumanvaluesglobally(16).The(2006).the30orsobioessentiale
8、lementsminedbyuseoffertilizersreplenishessoilsbut,given2.P.H.Bellamyetal.,Nature437,245(2005).biotafromrocks.Mostimportant,phospho-thetimescaleofsoilwat
