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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A dynamic organic soil biogeochemical model for simulating the effects of wildfire on soil environmental conditions and carbon dynamics of black spruce forests
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A dynamic organic soil biogeochemical model for simulating the effects of wildfire on soil environmental conditions and carbon dynamics of black spruce forests

机译：动态有机土壤生物地球化学模型，用于模拟野火对黑云杉林土壤环境条件和碳动态的影响

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摘要

Ecosystem models have not comprehensively considered how interactions among fire disturbance, soil environmental conditions, and biogeochemical processes affect ecosystem dynamics in boreal forest ecosystems. In this study, we implemented a dynamic organic soil structure in the Terrestrial Ecosystem Model (DOS-TEM) to investigate the effects of fire on soil temperature, moisture, and ecosystem carbon dynamics. DOS-TEM consists of environmental, ecological, disturbance effects, and dynamic organic soil modules. Changes in organic layer thickness are computed from calculated changes in carbon pools following fire and during stand succession. DOS-TEM was parameterized based on studies reported in the literature and evaluated independently at sites in interior Alaska. This evaluation reveals that (1) DOS-TEM is capable of accurately simulating the thickness and carbon content of organic soils; and (2) without the dynamic linkage between soil organic thickness and carbon content, the model overestimates soil carbon in deep mineral soil horizons of dry black spruce ecosystems of interior Alaska. Sensitivity tests were performed to investigate issues related to spatial heterogeneity of carbon dynamics including soil drainage and fire frequency. Results show that both soil drainage and fire frequency are important in the carbon dynamics simulated by DOS-TEM, and should be considered in spatial applications of the model.
机译：生态系统模型尚未全面考虑火灾干扰，土壤环境条件和生物地球化学过程之间的相互作用如何影响北方森林生态系统中的生态系统动态。在这项研究中，我们在陆地生态系统模型（DOS-TEM）中实现了动态有机土壤结构，以研究火灾对土壤温度，湿度和生态系统碳动态的影响。 DOS-TEM由环境，生态，干扰效应和动态有机土壤模块组成。有机层厚度的变化是根据火灾后和林分演替期间碳库的计算变化来计算的。根据文献报道的研究对DOS-TEM进行参数化，并在阿拉斯加内部站点进行独立评估。该评估结果表明：（1）DOS-TEM能够准确模拟有机土壤的厚度和碳含量; （2）在没有土壤有机厚度和碳含量之间存在动态联系的情况下，该模型高估了阿拉斯加内陆黑云杉生态系统深矿物土壤层中的土壤碳。进行了敏感性测试，以调查与碳动力学的空间异质性有关的问题，包括土壤排水和火灾频率。结果表明，土壤排水和火频在DOS-TEM模拟的碳动力学中都很重要，在模型的空间应用中应予以考虑。

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