Effects of Soil Fertility and Atmospheric CO2 Enrichment on Leaf,Stem and Root Dark Respiration of Populus tremuloides

编号 zgly0000246556

文献类型 期刊论文

文献题名 Effects of Soil Fertility and Atmospheric CO2 Enrichment on Leaf,Stem and Root Dark Respiration of Populus tremuloides

学科分类 220.99;林学其他学科

作者 X.Z.WANG  P.S.CURTIS 

作者单位 ColumbiaUniversity 

母体文献 PEDOSPHERE;土壤圈: 英文版 

年卷期 2001,11(3)

页码 199-208

年份 2001 

分类号 S792.119  S718.512.1 

关键词 树叶  暗呼吸作用  大气  二氧化碳  土壤肥力  根  茎  杨树 

文摘内容 An open-top chamber experiment was conducted at the University of Michigan Biological Station near Pellston,Michigan,USA,to study the effects of soil fertility and CO2 on leaf,sdtem and root dark respiration (Rd) of Populus tremuloides.Overall,area-based daytime leaf Rd(Rda) was significantly greater at elevated than at ambient CO2 in high-fertility soil,but not in low-fertility soil.Mass-based leaf Rd(Rdm) was overall greater for high-than for low-fertility soil grown trees at elevated,but not at ambient CO2 .Nighttime leaf Rda and Rdm were unaffected by soil fertility or CO2,nor was stem Rda ,which ranged from 1.0 to 1.4μmol m^-2s^-1 in the spring and 3.5 to 4.5μmol m^-2s^-1 in the summer.Root Rda was significantly higher in high-than in low-fertiliy soil,but was unaffected by CO2.Since biomass production of P.tremuloides will be significantly greater at elevated CO2 while specific Rd will either increase or remain unchanged,we predict that carbon loss to the atmosphere through respiration from this ecologically important species would increase at higher CO2.Soil fertility would also interact with elevated CO2 in affecting the carbon flow in the plant-soil-air system。