凋落叶分解--基于 Yasso07型

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摘要翻译：
凋落物分解是全球碳循环中的一个重要过程。它占土壤异养呼吸的大部分，并导致土壤有机碳(SOC)的形成，这是陆地上最大的碳储量。凋落物分解可能会对气候变化产生显著的反馈，因为它是一个依赖于气候的过程。为了研究凋落物分解的全球模式，我们对这一过程进行了描述，并使用大量的叶面凋落物质量损失测量（来自大约70,000个凋落物袋的近10,000个数据点）检验了这一描述的有效性。我们应用马尔可夫链蒙特卡罗方法来估计我们的模型YASSO07的参数值和结果的不确定度。该模型似乎适用于全球。它仅以凋落物化学、气温和降水作为输入变量，以很小的系统误差估算了凋落物类型（植物种类）和气候对前10个分解年质量损失的影响。为了说明凋落物质量损失率的全球变异性，我们的实例计算表明，典型的针叶树凋落物在冻土带分解两年后仍有68%的初始质量，而在热带落叶凋落物仅有15%的初始质量。这些估计数的不确定性是模型参数值不确定性的直接结果，根据垃圾袋数据在气候条件之间的分布而变化，从冻土带的2%到热带的4%不等。这种可靠性足以使用该模型，并将凋落物质量或气候条件的微小差异对凋落物分解的影响区分为统计显著。
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英文标题：
《Leaf litter decomposition -- Estimates of global variability based on
  Yasso07 model》
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作者：
M. Tuomi, T. Thum, H. J\"arvinen, S. Fronzek, B. Berg, M. Harmon, J.
  A. Trofymow, S. Sevanto, J. Liski
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最新提交年份：
2009
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分类信息：

一级分类：Quantitative Biology        数量生物学
二级分类：Other Quantitative Biology        其他定量生物学
分类描述：Work in quantitative biology that does not fit into the other q-bio classifications
不适合其他q-bio分类的定量生物学工作
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英文摘要：
  Litter decomposition is an important process in the global carbon cycle. It accounts for most of the heterotrophic soil respiration and results in formation of more stable soil organic carbon (SOC) which is the largest terrestrial carbon stock. Litter decomposition may induce remarkable feedbacks to climate change because it is a climate-dependent process. To investigate the global patterns of litter decomposition, we developed a description of this process and tested the validity of this description using a large set of foliar litter mass loss measurements (nearly 10 000 data points derived from approximately 70 000 litter bags). We applied the Markov chain Monte Carlo method to estimate uncertainty in the parameter values and results of our model called Yasso07. The model appeared globally applicable. It estimated the effects of litter type (plant species) and climate on mass loss with little systematic error over the first 10 decomposition years, using only initial litter chemistry, air temperature and precipitation as input variables. Illustrative of the global variability in litter mass loss rates, our example calculations showed that a typical conifer litter had 68% of its initial mass still remaining after two decomposition years in tundra while a deciduous litter had only 15% remaining in the tropics. Uncertainty in these estimates, a direct result of the uncertainty of the parameter values of the model, varied according to the distribution of the litter bag data among climate conditions and ranged from 2% in tundra to 4% in the tropics. This reliability was adequate to use the model and distinguish the effects of even small differences in litter quality or climate conditions on litter decomposition as statistically significant.
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PDF链接：
https://arxiv.org/pdf/0906.0886

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关键词：Quantitative Illustrative Calculations distribution Measurements 分解 物质量 mass decomposition 凋落