Greenhouse Gas Budget of a Cool-Temperate Deciduous Broad-Leaved Forest in Japan Estimated Using a Process-Based Model
Greenhouse Gas Budget of a Cool-Temperate Deciduous Broad-Leaved Forest in Japan Estimated Using a Process-Based Model
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DOI：
10.1007/s10021-010-9332-7
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发表时间：
2010-04
期刊：
影响因子：
3.7
通讯作者：
M. Inatomi;A. Ito;K. Ishijima;S. Murayama
中科院分区：
文献类型：
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作者：
M. Inatomi;A. Ito;K. Ishijima;S. Murayama
为了模拟温室气体（CO2、CH4和N2O）在大气与生态系统之间的交换，并考虑每种气体的辐射强迫效应，建立了一个全面整合生物地球化学碳和氮循环的陆地生态系统模式，即植被痕量气体综合模拟模型（VISIT）。然后将该模型应用于日本中部高山（36°08′n, 137°25′e，海拔1420 m）的寒温带落叶阔叶林。利用时间序列气象和氮沉降数据，在1948 ~ 2008年逐日时间步长进行了模拟。VISIT准确地捕获了这片典型日本森林的碳和氮循环，并通过塔和室通量测量得到了验证。在模拟的最后10年中，该模型估计森林是一个净温室气体汇，其全球变暖潜能值相当于1025.7 g CO2m - 2y - 1，其中大部分（1016.9 g CO2m - 2y - 1）是由森林生物量再生的净二氧化碳吸收所贡献的。森林土壤的ch4氧化对净汇的贡献较小（11.9 g co2当量）。m−2y−1)，而N2O排放是一个非常小的来源（3.2 g co2当量）。M−2y−1)，与湿润气候下的火山土一致。全球升温潜能值对温度、降水和氮沉降变化的敏感性分析表明，温度升高会导致碳汇大小减小，这主要是由于生态系统呼吸增加导致co2释放增加。
A terrestrial ecosystem model, called the Vegetation Integrative Simulator for Trace gases model (VISIT), which fully integrates biogeochemical carbon and nitrogen cycles, was developed to simulate atmosphere–ecosystem exchanges of greenhouse gases (CO2, CH4, and N2O), and to determine the global warming potential (GWP) taking into account the radiative forcing effect of each gas. The model was then applied to a cool-temperate deciduous broad-leaved forest in Takayama, central Japan (36°08′N, 137°25′E, 1420 m above sea level). Simulations were conducted at a daily time step from 1948 to 2008, using time-series meteorological and nitrogen deposition data. VISIT accurately captured the carbon and nitrogen cycles of this typical Japanese forest, as validated by tower and chamber flux measurements. During the last 10 years of the simulation, the model estimated that the forest was a net greenhouse gas sink, having a GWP equivalent of 1025.7 g CO2m−2y−1, most of which (1016.9 g CO2m−2y−1) was accounted for by net CO2sequestration into forest biomass regrowth. CH4oxidation by the forest soil made a small contribution to the net sink (11.9 g CO2-eq. m−2y−1), whereas N2O emissions were a very small source (3.2 g CO2-eq. m−2y−1), as expected for a volcanic soil in a humid climate. Analysis of the sensitivity of GWP to changes in temperature, precipitation, and nitrogen deposition indicated that warming temperatures would decrease the size of the sink, mainly as a result of increased CO2release due to increased ecosystem respiration.