| 从树轮纤维素δ13C序列看树木生长对大气CO2浓度变化的响应 |
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| 引用本文： | 陈拓,秦大河,任贾文,孙维贞,李江风.从树轮纤维素δ13C序列看树木生长对大气CO2浓度变化的响应[J].冰川冻土,2001,23(1):41-45. |
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| 作者姓名： | 陈拓 秦大河 任贾文 孙维贞 李江风 |
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| 作者单位： | 1. 中国科学院寒区旱区环境与工程研究所冰芯与寒区环境开放研究实验室,
2. 新疆气象科学研究所, |
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| 基金项目： | 中国科学院科技攻关项目;KZ951-A1-205，KZ951-A1-402-03，KZ952-S1-216; |
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| 摘 要： | 在新疆昭苏树轮碳同位素组成研究的基础上，初步分析了近280a以来云杉内外CO2浓度比（Ci/Ca)，云杉内部CO2浓度（Ci)和水分利用效率（A／g)的变化，结果表明，在整个分析时段内Ci/Ca相对恒定在0．52左右，暗示树木生长对大气CO2浓度升高的基本响应策略；Ci和A/g都有较明显的升高趋势，说明可能有更多的碳被固定在树木之中，进一步分析表明，它们的这种趋势与大气CO2浓度变化有关，从另一个侧面证明了人类活动释放的碳有一部分被树木吸收。
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| 关 键 词： | 树轮 碳同位素 植物内外CO2浓度比 水分利用效率 纤维素 大气 |
| 文章编号： | 1000-0240(2001)01-0041-05 |
| 修稿时间： | 2000年2月29日 |
Response of CO2 Concentration Parameters and Water-Use Efficiency Derived from Tree-Ring δ13C Series to Atmospheric CO2 Increase |
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| CHEN Tuo,QIN Da-he,REN Jia-wen,SUN Wei-zhen,LI Jiang-feng.Response of CO2 Concentration Parameters and Water-Use Efficiency Derived from Tree-Ring δ13C Series to Atmospheric CO2 Increase[J].Journal of Glaciology and Geocryology,2001,23(1):41-45. |
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| Authors: | CHEN Tuo QIN Da-he REN Jia-wen SUN Wei-zhen LI Jiang-feng |
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| Abstract: | The well-documented increase in CO2 content of atmosphere since the beginning of industrialization has been variously attributed to the anthropogenic activities, such as agricultural explosion, global deforestation and enhanced fossil fuel combustion and so on. It was estimated that about one third of anthropogenic CO2 released to atmosphere was taken up by terrestrial plants. To evaluate how the land carbon reservoir has been acting as a sink to the anthropogenic CO2 input to atmosphere, it is important to study how plants in forests physiologically adjust to the changing atmospheric conditions. This has been studied intensively using controlled experiments, but it has been difficuh to scale short-term observations to long term ecosystem-level response. However, models of carbon discrimination during carbon fixation show that Cs plants are not passive recorders: carbon isotopic variations are subjected to strong physiological control through leaf gas exchange regulation. Therefore, records of carbon discrimination in tree-ring cellulose could be used to study past variations of the ecophysiology of trees in reaction to environmental variations, in addition to the reconstruction of past environments. In this paper, based on the tree-ring series from Zhaosu County of Xinjiang, the changes of the ratio of CO2 concentration in the intercellular space of leaves to that-on the atmosphere (Ci/Ca), CO2 concentration in the intercellular space of leaves (Ci) and plant water-use efficiency (A/g) derivec from carbon isotope chronology were analyzed for the past 240 a. The results show a relatively constant Ci/Ca value of 0. 52 during the whole period, suggesting a strategy of response of plants to increased atmospheric CO2 concentration. Significant increasing trends of Ci and A/g are also found, implying more carbon being fixed; Further analysis shows that their changes are related to atmospheric CO2 concentration, thus it is demonstrated that trees maybe take up the portion of anthropogenic CO2 from another aspect. |
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| Keywords: | tree ring carbon isotope ratio of CO 2 concentration in the intercellular space of leaves to that on the atmosphere water use efficiency |
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