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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >On Upscaling of Soil Microbial Processes and Biogeochemical Fluxes From Aggregates to Landscapes
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On Upscaling of Soil Microbial Processes and Biogeochemical Fluxes From Aggregates to Landscapes

机译：综合从聚集体与园林中土壤微生物过程和生物地球化学通量的升高

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摘要

Soil microbial communities respond to spatial and temporal variations in environmental conditions (e.g., saturation and ambient temperatures) as reflected in the dynamics of microbially produced greenhouse gas (GHG) fluxes (primarily CO_2, N_2O, and CH_4) emitted from soil surfaces. Despite considerable progress in resolving key soil microbial processes, their quantification remains largely empirical with limited predictability. We report a mechanistic and analytical modeling framework for integrating local environmental effects on GHG-producing microbial processes primarily in soil aggregates (or other hot spots) and the upscaling of these to regional GHG fluxes. The mechanistic model enables systematic evaluation of how soil structural features (e.g., aggregation and layers), spatial variability, and dynamic ambient conditions (e.g., temperature and hydration) affect soil microbial functioning. The upscaling of microbial processes from aggregates of different sizes to soil profiles and landscapes implements mechanistically derived microbial response functions with spatial information on soil type, land cover, and resource distribution. The modeling framework was evaluated using reported field data for seasonal N_2O emissions from subarctic regions resulting in reasonable agreement. The proposed analytical framework offers a practical compromise balancing a simplified representation of dynamic microbial processes that respond to local conditions with an upscalable representation of soil GHG fluxes over landscapes under changing environmental conditions.
机译：土壤微生物社区对环境条件（例如，饱和度和环境温度）的空间和时间变化反应，如在从土壤表面发射的微生物生产的温室气体（GHG）助熔剂（主要CO_2，N_2O和CH_4）的微生物生产的温室气体（GHG）助熔剂（主要CO_2，N_2O和CH_4）中的动态。尽管解决了关键土壤微生物过程，但它们的定量在很大程度上仍然具有有限的可预测性。我们报告了一种机械和分析建模框架，用于将局部环境效应整合到主要在土壤聚集体（或其他热点）和区域温室气体助熔剂上的升高的产生的GHG产生的微生物过程。机械模型能够系统评估土壤结构特征（例如聚集和层），空间可变性和动态环境条件（例如，温度和水合）影响土壤微生物功能的影响。从不同尺寸的聚集体的微生物过程的上升与土壤剖面和景观实现机械源性衍生的微生物反应函数，具有关于土壤类型，陆地覆盖和资源分布的空间信息。使用报告的现场数据评估建模框架，以获得来自亚曲区域的季节性N_2O排放，从而产生合理的协议。所提出的分析框架提供了实际折衷的实际折衷，平衡了动态微生物过程的简化表示，这些过程响应了当地条件，在不断变化的环境条件下的景观中的土壤温室气体势态的上升表示。

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