Eddy covariance CO2 flux above a Gmelin larch forest on continuous permafrost in Central Siberia during a growing season
Eddy covariance CO2 flux above a Gmelin larch forest on continuous permafrost in Central Siberia during a growing season
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DOI：
10.1007/s00704-007-0337-x
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发表时间：
2008-01
影响因子：
3.4
通讯作者：
Y. Nakai;Y. Matsuura;T. Kajimoto;A. P. Abaimov;S. Yamamoto;O. Zyryanova
中科院分区：
文献类型：
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作者：
Y. Nakai;Y. Matsuura;T. Kajimoto;A. P. Abaimov;S. Yamamoto;O. Zyryanova
落叶松(Larix Gmelinii)林是西伯利亚中部连续多年冻土区的典型植被。与其他地区的北方森林相比，这种西伯利亚落叶松针叶林的碳收支信息仍然有限，而落叶松森林由于广泛分布在欧亚大陆东北部，预计将在全球碳平衡中发挥关键作用。本文报道了俄罗斯西伯利亚中部(°16‘N，东经100°12’，250 m a.s.l)落叶松成熟林的涡动协方差CO_2通量测量结果。这些测量是在一个生长季节(2004年6月至9月初)进行的。落叶松对CO2的吸收从6月上旬开始，到6月下旬急剧增加，这与落叶松的物候期(即抽芽和针叶冲刷)密切相关。最大半小时净CO2吸收是∼6 m−2s−1。∼2 g C m−2day−1的最大日净吸收出现在6月底和7月中旬。累积净吸收为76-78 g C m−2，表明成熟落叶松林在整个生长季节(91天)是CO2的净汇。然而，与其他北方森林相比，该森林的净CO2吸收和夜间释放的幅度以及累积净CO2吸收的幅度都较低。我们认为，研究林分较低的净生态系统CO2吸收主要与较低的叶面积指数有关。
Gmelin larch (Larix gmelinii) forests are representative vegetation in the continuous permafrost region of Central Siberia. Information on the carbon budget is still limited for this Siberian larch taiga in comparison to boreal forests in other regions, while the larch forests are expected to play a key role in the global carbon balance due to their wide distribution over North–East Eurasia. The authors reported results of eddy covariance CO2flux measurements at a mature Gmelin larch stand in Central Siberia, Russia (64°16′N, 100°12′E, 250 m a.s.l.). The measurements were conducted during one growing season (June-early September in 2004). CO2uptake was initiated in early June and increased sharply until late June, which was closely related to the phenology of the larch trees (i.e., bud-break and needle flush). Maximum half-hourly net CO2uptake was ∼6 µmol m−2s−1. Maximum daily net uptake of ∼2 g C m−2day−1occurred at the end of June and in mid-July. Cumulative net uptake was 76–78 g C m−2, indicating that the mature larch forest acted as a net sink for CO2during the growing season (91 days). In comparison with other boreal forests, however, the magnitude of net CO2uptake and night-time release of the forest, and cumulative net CO2uptake were lower. We suggest that lower net ecosystem CO2uptake of the study stand was primarily associated with low leaf area index.