Interactive Impacts of Fire and Vegetation Dynamics on Global Carbon and Water Budgets using Community Land Model version 4.5
Interactive Impacts of Fire and Vegetation Dynamics on Global Carbon and Water Budgets using Community Land Model version 4.5
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使用社区土地模型 4.5 版研究火灾和植被动态对全球碳和水预算的交互影响
DOI：
10.5194/gmd-2018-231
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Yeonjoo Kim
中科院分区：
文献类型：
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作者：
H. Seo;Yeonjoo Kim
抽象的。火在陆地生态系统中发挥着重要作用。生物质的燃烧影响碳和水通量以及植被的分布。为了了解火灾和生态演替的相互作用过程对地表碳和水通量的影响，本研究利用社区土地模型4.5版进行了一系列包括和排除火灾和动态植被过程的实验。排除动态植被的实验结果显示，火灾后地区的净生态系统生产（NEP）在全球范围内有所增加，这在之前的类似建模实践研究中已得到证明。然而，纳入动态植被揭示了一些地区火灾引起的 NEP 下降。此外，当主要植被类型从树木变为草地时，火灾后地区的碳汇减少。这项研究表明，纳入动态植被可以通过减少陆地碳汇来增加火灾造成的碳排放；然而，当不使用动态植被时，陆地碳汇的增加会在一定程度上减轻这种影响。结果还表明，火灾引起的植被变化改变了土壤湿度分布，因为草原在火灾后地区更为占主导地位；与未燃烧区域相比，这导致表层土壤中的水分较少，尽管蒸腾作用总体减少。这些发现与以前的火灾模型评估不同，以前的火灾模型评估忽略了植被动态，因此强调了火灾和植被动态之间相互作用过程的重要性，特别是在评估火灾和植被动态方面的最新模型开发时。
Abstract. Fire plays an important role in terrestrial ecosystems. The burning of biomass affects carbon and water fluxes and the distribution of vegetation. To understand the effect of the interactive processes of fire and ecological succession on land surface carbon and water fluxes, this study utilized the Community Land Model version 4.5 to conduct a series of experiments that included and excluded fire and dynamic vegetation processes. Results of the experiments that excluded dynamic vegetation showed a global increase in net ecosystem production (NEP) in post-fire regions, which has been shown in previous studies with the similar modeling practices. However, inclusion of dynamic vegetation revealed a fire-induced decrease in NEP in some regions. Additionally, the carbon sink in post-fire regions reduced when the dominant vegetation type was changed from trees to grasses. This study shows that inclusion of dynamic vegetation enhances carbon emissions from fire by reducing terrestrial carbon sinks; however, this effect is somewhat mitigated by the increase in terrestrial carbon sinks when dynamic vegetation is not used. Results also show that fire-induced changes in vegetation modify the soil moisture profile because grasslands are more dominant in post-fire regions; this results in less moisture within top soil layers compared to non-burned regions, even though transpiration is reduced overall. These findings are different from those of previous fire model evaluations, that ignore vegetation dynamics, and thus highlight the importance of interactive processes between fire and vegetation dynamics, particularly when evaluating recent model developments with respect to fire and vegetation dynamics.