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1、应用生态学报摇2011年9月摇第22卷摇第9期摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇ChineseJournalofAppliedEcology,Sep.2011,22(9):2227-2232*海拔梯度对长白山北坡岳桦水分利用效率的影响1,21,21,2111**1王庆伟摇齐摇麟摇田摇杰摇周旺明摇丁摇宏摇于大炮摇代力民12(中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室,沈阳110164;中国科学院研究生院,北京100049)摘摇要摇以分布于长白山北坡海拔1800~2050m的岳桦林为对象,以叶
2、片碳稳定同位素13(啄C)值作为岳桦长期水分利用效率指示值,探讨海拔梯度对岳桦林水分利用效率的影响.结果表明:随海拔升高,岳桦林土壤体积含水量、比叶质量极显著增加,而叶片含水量和土壤13-1温度显著降低;岳桦叶片啄C值与海拔呈极显著正相关,增幅为1.013译·(100m),与土壤体积含水量、比叶质量呈显著正相关,与生长季土壤平均温度、叶片含水量呈显著负相关.温度不是长白山林线的唯一限制性因子,海拔梯度上水热条件的差异及其交互作用可能造成岳桦生长期间的生理干旱.13关键词摇海拔摇水分胁迫摇林线摇碳稳定同位素(啄C)长白山文章编号
3、摇1001-9332(2011)09-2227-06摇中图分类号摇Q948摇文献标识码摇AEffectsofaltitudinalgradientonwateruseefficiencyofBetulaermaniionthenorthernslope1,21,21,2ofChangbaiMountains,NortheastChina.WANGQing鄄wei,QILin,TIANJie,ZHOU11111Wang鄄ming,DINGHong,YUDa鄄pao,DAILi鄄min(StateKeyLaboratoryofFo
4、restandSoilEcology,InstituteofAppliedEcology,ChineseAcademyofSciences,Shenyang110164,China;2GraduateUniversityofChineseAcademyofSciences,Beijing100049,China).鄄Chin.J.Appl.Ecol.,2011,22(9):2227-2232.Abstract:TakingBetulaermaniiforestsdistributedatthealtitudes1800-205
5、0monthenorthern13slopeofChangbaiMountainsastestobjects,andusingleafcarbonisotopecontent(啄C)asanin鄄dicatorofB.ermaniiwateruseefficiency(WUE),thispaperstudiedtheeffectsofaltitudinalgra鄄dientontheWUEofB.ermaniiforestsinthearea.Withtheincreaseofaltitude,thesoilvolumet鄄r
6、icwatercontent(VMC)andtheleafmassperarea(LMA)ofB.ermaniiincreasedsignificantly,whiletheleafwatercontent(LWC)andsoiltemperaturewereinadverse.Therewasasignificant1313positivecorrelationbetweenleaf啄Candaltitude,withtheincrementofleaf啄Cbeing1郾013-113译·(100m),andtheleaf啄
7、CwaspositivelycorrelatedwithsoilVWCandLMAbutnegativelycorrelatedwithsoiltemperatureandLWC.Temperaturewasnotthesolelimitingfactorforthedis鄄tributionoftreelineinChangbaiMountains,whereasthephysiologicaldroughtofB.ermaniiduringitsgrowingseasoncausedbythedifferentwatera
8、ndheatconditionsandtheirinteractionsalongthealtitudinalgradientcouldbetheotherlimitingfactors.13Keywords:altitude;waterstress;treeline;car
