Long-term ci/ca response of trees in western North America to atmospheric CO2 concentration derived from carbon isotope chronologies
Long-term ci/ca response of trees in western North America to atmospheric CO2 concentration derived from carbon isotope chronologies
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DOI：
10.1007/s004420050626
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发表时间：
1998-01-01
期刊：
影响因子：
2.7
通讯作者：
Feng, XH
中科院分区：
文献类型：
--
作者：
Feng, XH
为了评估陆地碳库如何应对大气中二氧化碳浓度上升，研究天然林中的植物如何对不断变化的大气条件进行生理调整非常重要。许多实验研究已经解决了这个问题，但很难将短期实验观察扩展到长期生态系统层面的响应。本文通过对天然林树木的测量得出了过去 100-200 年与碳同位素相关的变量。计算表明，树木的c(i)/c(a)比值[c(i)/c(a)是叶片细胞间隙中CO2浓度(μ mol mol(-1))与大气中CO2浓度的比值]在20世纪以前保持不变或略有增加，但在20世纪变化较快；有的增加，有的减少，有的保持不变。相比之下，所有树木植物叶子内的二氧化碳浓度均单调增加。
To evaluate how the land carbon reservoir has been responding to the rising CO2 concentration of the atmosphere, it is important to study how plants in natural forests adjust physiologically to the changing atmospheric conditions. Many experimental studies have addressed this issue, but it has been difficult to scale short-term experimental observations to long-term ecosystem-level responses. This paper derives carbon-isotope-related variables for the past 100-200 years from measurements on trees from natural forests. Calculations show that the c(i)/c(a) ratios [c(i)/c(a) is the ratio of the CO2 concentration (mu mol mol(-1)) in the intercellular space of leaves to that in the atmosphere] of the trees were constant or increased slightly before the 20th century, but changed more rapidly in the 20th century; some increased, some decreased, and some stayed constant. In contrast, the CO2 concentration inside plant leaves increased monotonically for all trees.