Williams William E, Garbutt K, Bazzaz F A, Vitousek P M
Department of Organismic and Evolutionary Biology, Harvard University, 02138, Cambridge, MA, USA.
Department of Biological Sciences, Stanford University, 94305, Stanford, CA, USA.
Oecologia. 1986 Jun;69(3):454-459. doi: 10.1007/BF00377068.
Tree saplings, two groups of three species from each of two deciduous tree communities, were grown in competition at three CO concentrations and two light levels. After one growing season, biomass was measured to assess the effect of CO on community structure, and nitrogen and phosphorus concentrations were measured for leaves, stems, and roots of all trees. Gas-exchange measurements were made on the same species grown under the same CO concentrations.Photosynthetic capacity (rate of photosynthesis at saturating CO and light) tended to decline as CO concentration increased, but differences were not statistically significant. Stomatal conductance declined significantly as CO increased. Nitrogen and phosphorus concentrations generally declined as CO increased, but there were some unexpected patterns in roots and stems. CO concentration did not significantly affect the overall growth of either community after one season, but the relative biomass of each species changed in a complex way, depending on CO light level, and community.
树苗，来自两个落叶树群落中每组三种的两组树苗，在三种二氧化碳浓度和两种光照水平下进行竞争生长。经过一个生长季节后，测量生物量以评估二氧化碳对群落结构的影响，并测量所有树木的叶片、茎和根中的氮和磷浓度。对在相同二氧化碳浓度下生长的相同物种进行气体交换测量。光合能力（在饱和二氧化碳和光照下的光合作用速率）倾向于随着二氧化碳浓度的增加而下降，但差异无统计学意义。气孔导度随着二氧化碳浓度的增加而显著下降。氮和磷浓度通常随着二氧化碳浓度的增加而下降，但在根和茎中存在一些意外模式。经过一个季节，二氧化碳浓度对两个群落的总体生长均无显著影响，但每个物种的相对生物量以复杂的方式变化，这取决于二氧化碳、光照水平和群落。
