Net ecosystem productivity and peat accumulation in a Siberian Aapa mire
Net ecosystem productivity and peat accumulation in a Siberian Aapa mire
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西伯利亚阿帕沼泽的净生态系统生产力和泥炭积累
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
E. Vaganov
中科院分区：
文献类型：
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作者：
E.;A. Prokuschkin;A. Arneth;N. Knorre;E. Vaganov
摘要采用两种方法研究了西伯利亚中部针叶林沼泽的净生态系统生产力（NEP），即松树下胚轴上方泥炭的积累和涡度相关通量方法。使用泥炭累积法计算的NEP为0.84 tC ha−1 yr−1;使用涡度相关法计算的NEP为0.43-0.62 tC ha−1 yr−1。将这些数据与周围森林的NEP（0.6 tC±1.1 ha−1 yr−1）进行了比较。当泥炭积累量达到0.5- 0.6m时，生长在沼泽上的树木总高约3 m，树龄80-120年。在那个阶段，最老的树木的生长速度下降了。这表明，根据条件的不同，在沙丘上生长的树木有一个最大年龄（<150年）。数据表明，在沼泽中的NEP的测定通过使用泥炭积累以上的下胚轴是一个有用的方法，可以应用于范围广泛的沼泽类型，但它可能会系统地高估NEP。沼泽的碳同化的总汇容量与森林相当，尽管在评估区域碳循环时必须考虑甲烷排放和溶解有机碳的损失。
Abstract Net ecosystem productivity (NEP) was studied in a bog located in the middle taiga of Siberia using two approaches, the accumulation of peat above the hypocotyl of pine trees, and the eddy covariance flux methodology. NEP was 0.84 tC ha−1 yr−1 using the peat accumulation method; it was 0.43–0.62 tC ha−1 yr−1 using eddy covariance over three growing seasons. These data were compared with NEP of the surrounding forest, which was 0.6 tC±1.1 ha−1 yr−1. The trees growing on the bog reached a total height of about 3 m and an age of 80–120 yr when peat accumulation reached 0.5–0.6 m. At that stage the growth rate of the oldest trees declined. This indicates that there is a maximum age that can be reached by trees growing on hummocks (<150 yr), depending on conditions. The data show that the determination of NEP in bogs by using the peat accumulation above the hypocotyl is a useful method which can be applied on a wide range of bog types, but it may systematically overestimate NEP. The total sink capacity for carbon assimilation of bogs is comparable to that of forest, although methane emissions and losses of dissolved organic carbon must be taken into account when assessing the regional carbon cycle.