Turnover of recently assimilated carbon in arctic bryophytes.
Turnover of recently assimilated carbon in arctic bryophytes.
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北极苔藓植物中最近同化的碳的周转。
DOI：
10.1007/s00442-011-1988-y
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发表时间：
2011
期刊：
影响因子：
2.7
通讯作者：
Street LE
中科院分区：
文献类型：
--
作者：
Street LE
碳在北极的分配和周转在很大程度上是未知的，但它们对气候变化的反应对北极生态系统的碳收支有潜在的重大影响。结合脉冲追踪实验和新开发的碳周转模型，我们发现两种对比的北极苔藓物种之间的碳周转存在显着差异苔藓组织中的~（13）C丰度（测量时间长达1年）和呼吸的CO2（追踪超过5天）被用于参数化具有代表光合和茎组织中的不稳定和结构C的四个池的britte C模型。该模型使用EnergyKalman滤波器进行优化，以确保重点估计模型参数和输出的置信区间（CI）。毛状金发藓地上部分NPP：GPP的比值为23%（CI 9-35%），平均周转时间为1.7 d（CI 1.1-2.5 d）。泥炭藓地上部分NPP/GPP比值为43%（CI 19-65%），平均周转时间为3.1 d（CI 1.6-6.1 d）。这些结果是第一次显示在北极brituete物种在原地之间的C分区的差异，并强调了建模C动力学的重要性，这组分别从维管植物在北极C模型中的植被的一个现实的代表。
Carbon (C) allocation and turnover in arctic bryophytes is largely unknown, but their response to climatic change has potentially significant impacts on arctic ecosystem C budgets. Using a combination of pulse-chase experiments and a newly developed model of C turnover in bryophytes, we show significant differences in C turnover between two contrasting arctic moss species (Polytrichum piliferumandSphagnum fuscum).13C abundance in moss tissues (measured up to 1 year) and respired CO2(traced over 5 days) were used to parameterise the bryophyte C model with four pools representing labile and structural C in photosynthetic and stem tissue. The model was optimised using an Ensemble Kalman Filter to ensure a focus on estimating the confidence intervals (CI) on model parameters and outputs. The ratio of aboveground NPP:GPP inPolytrichum piliferumwas 23% (CI 9–35%), with an average turnover time of 1.7 days (CI 1.1–2.5 days). The aboveground NPP:GPP ratio inSphagnum fuscumwas 43% (CI 19–65%) with an average turnover time of 3.1 days (CI 1.6–6.1 days). These results are the first to show differences in C partitioning between arctic bryophyte species in situ and highlight the importance of modelling C dynamics of this group separately from vascular plants for a realistic representation of vegetation in arctic C models.