NewPhytologist《新植物学家》Leafnitrogenandphosphorusstoichiometryacross753terrestrialplantspeciesinChina中国753种陆生植物叶片中N和P的化学计量学WenxuanHan,激ngyunFang,DaliGuoandYanZhangDepartmentofEcology,CollegeofEnvironmentalSciencesandKeyLaboratoryforEarthSurfaceProcessesoftheMinistryofEducation,PekingUniversity,100871,Bei激ng,China韩文轩Summary（摘要）•LeafnitrogenandphosphorusstoichiometryofChineseterrestrialplantswasstudiedbasedonanationaldatasetincluding753speciesacrossthecountry.中国陆生植物叶片中N和P化学计量学研究基于全国性的数据收集，包括全国753种植物种。•Geometricmeanswerecalculatedforfunctionalgroupsbasedonlifeform,phylogenyandphotosyntheticpathway,aswellasforall753species.TherelationshipsbetweenleafNandPstoichiometrictraitsandlatitude(andtemperature)wereanalysed.本文计算了所有753个物种基于生活型功能组的几何平均数，发展史和光合途径，并且分析了叶片中N和P的化学计量特征与纬度（温度）之间的关系。•ThegeometricmeansofleafN,P,andN:Pratioforthe753specieswere18.6and1.21mgg−1and14.4,respectively.Withincreasinglatitude(decreasingmeanannualtemperature,MAT),leafNandPincreased,buttheN:Pratiodidnotshowsignificantchanges.这753个物种的叶片N,P以及N:P比率的几何平均数分别为18.6mg/g,12.2mg/g和14.4.随着纬度的增加（意味着平均年均温的减少），叶片中N和P的量随之增加，但是N:P比率却没有显著地变化。•AlthoughpatternsofleafN,PandN:Pratiosacrossthefunctionalgroupsweregenerallyconsistentwiththosereportedpreviously,theoverallN:PratioofChina’sflorawasconsiderablyhigherthantheglobalaverages,probablycausedbyagreatershortageofsoilPinChinathanelsewhere.TherelationshipsbetweenleafN,PandN:Pratioandlatitude(andMAT)alsosuggestedtheexistenceofbroadbiogeographicalpatternsoftheseleaftraitsinChineseflora.尽管这些跨功能组中叶片N,P和N:P比率的模式一般符合之前的文章，但是整个中国植物群落的N:P比率远远高于全球平均水平，由此可能导致相对于全球其他地方，中国土壤中严重缺乏P。叶片N,P,N:P比率与纬度（或年均温）之间的关系也表明：在中国植物的这些叶子中存在着广泛的生物地理学特征。Keywords:China,leafnitrogen(N)andphosphorus(P)contents,N:Pratio,plantfunctionalgroups,soilP.关键词：中国，叶片氮（N）和磷（P）含量，N:P比率，植物功能群，土壤磷NewPhytologist(2005)168:377–385©NewPhytologist(2005)doi:10.1111/j.1469-8137.2005.01530.xIntroduction（引言）Nitrogenandphosphorusplayvitalrolesinplantfunctioning,andareamongthemostimportantlimitingnutrientsinterrestrialecosystems(Chapin,1980;Reichetal.,1997).Accordingly,patternsofNandPstatusinplantbiomass,andespeciallyinleaves,havebeenstudiedintensely(Foulds,1993;KoerselmanMeuleman,1996;Nielsenetal.,1996;Reichetal.,---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---1997;Thompsonetal.,1997;Cunninghametal.,1999;Reichetal.,1999,2003;ReichOleksyn,2004).AnumberofstudieshaverevealedthatplantNandPconcentrationsareassociatedwithmanybioticandabioticfactors,includinghabitat(Hou,1982;Foulds,1993;KoerselmanMeuleman,1996;Thompsonetal.,1997;Cunninghametal.,1999);growthstages(Nielsenetal.,1996;Thompsonetal.,1997;Elseretal.,2000a;SternerElser,2002);andplantfunctionalgroups(Reichetal.,1999).PreviousstudieshavealsoshownthattheratioofleafNtoleafPcontentinplantbiomasscanbeanindicatorofvegetationcomposition,functioningandnutrientlimitationatthecommunitylevel(KoerselmanMeuleman,1996;Güsewell,2004).AnN:Pratio<14generallyindicatesNlimitation,whilearatio>16suggestsPlimitati...