Linking Soil Structure, Hydraulic Properties, and Organic Carbon Dynamics: A Holistic Framework to Study the Impact of Climate Change and Land Management
Linking Soil Structure, Hydraulic Properties, and Organic Carbon Dynamics: A Holistic Framework to Study the Impact of Climate Change and Land Management
复制标题
DOI：
10.1029/2023jg007389
复制
发表时间：
2023-07
期刊：
影响因子：
--
通讯作者：
Achla Jha;S. Bonetti;A. P. Smith;R. Souza;S. Calabrese
中科院分区：
文献类型：
--
作者：
Achla Jha;S. Bonetti;A. P. Smith;R. Souza;S. Calabrese
气候变化和不可持续的土地管理做法导致了广泛的土壤退化，包括土壤结构的改变（即，团聚体和孔径分布），土壤有机碳的损失，以及水和养分保持能力的降低。尽管土壤结构、水文过程和生态地球化学通量紧密相连，但在当前的生态水文学、水文学和陆地生物圈模型中，它们之间的相互作用往往没有得到考虑。为了更全面地预测土壤水文和土壤地球化学循环，无论是在自然生态系统还是农业生态系统中，模型都需要考虑土壤结构和大孔隙动态。在这里，我们提出了一个理论框架，耦合土壤水文过程和土壤微生物活性的土壤有机碳动态，通过土壤结构的动态。特别是，我们链接的千禧年土壤碳动力学模型，明确模拟土壤团聚体的形成和分解，最近参数化的土壤持水和水力传导率曲线和溶质和O2扩散率的基础上土壤微孔隙度。为了说明将土壤结构的动态的意义，我们应用的框架，土壤和植被恢复随着时间的推移，从农业实践的案例研究。新的框架能够更全面地预测气候变化和土地管理做法对土壤水文和地球化学循环的影响。
Climate change and unsustainable land management practices have resulted in extensive soil degradation, including alteration of soil structure (i.e., aggregate and pore size distributions), loss of soil organic carbon, and reduction of water and nutrient holding capacities. Although soil structure, hydrologic processes, and biogeochemical fluxes are tightly linked, their interaction is often unaccounted for in current ecohydrological, hydrological and terrestrial biosphere models. For more holistic predictions of soil hydrological and biogeochemical cycles, models need to incorporate soil structure and macroporosity dynamics, whether in a natural or agricultural ecosystem. Here, we present a theoretical framework that couples soil hydrologic processes and soil microbial activity to soil organic carbon dynamics through the dynamics of soil structure. In particular, we link the Millennial model for soil carbon dynamics, which explicitly models the formation and breakdown of soil aggregates, to a recent parameterization of the soil water retention and hydraulic conductivity curves and to solute and O2 diffusivities to soil microsites based on soil macroporosity. To illustrate the significance of incorporating the dynamics of soil structure, we apply the framework to a case study in which soil and vegetation recover over time from agricultural practices. The new framework enables more holistic predictions of the effects of climate change and land management practices on coupled soil hydrological and biogeochemical cycles.