Fires produce an aromatic particulate residue commonly referred to as pyrogenic carbon (PyC). Particulate PyC is low density, high porosity, and is predominantly deposited on the soil surface in post‐fire landscapes. These characteristics create a material that is prone to mobility, both vertically down the soil profile and laterally across the landscape even in low‐relief landforms. Because of its tendency for lateral mobilization, we argue here that PyC's first interaction with water determines its environmental fate and persistence, not its interactions with soil minerals or microbes. PyC's first interactions with water determine: the amount of PyC that will enter the soil profile and experience microbial and geochemical alterations, whether it will be buried in depositional environments and stored on the landscape, or if it will be transported to streams and eventually to the ocean. Here we posit that this crucial first interaction with the hydrologic cycle occurs on the timescale of days to weeks, and therefore supersedes microbial decomposition as the primary control on PyC's environmental persistence. © 2020 John Wiley & Sons, Ltd.

中文翻译：

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与水文循环的首次相互作用决定了地球系统中热解碳的命运

火灾会产生芳香颗粒残留物，通常称为热解碳（PyC）。颗粒状PyC是低密度，高孔隙率的，主要沉积在火灾后景观的土壤表面。这些特征创造了一种易于移动的材料，既在垂直于土壤剖面的方向上，又在横向横跨景观的方向上，即使在低起伏的地貌中也是如此。由于其横向移动的趋势，我们在这里认为PyC与水的首次相互作用决定了其环境命运和持久性，而不是其与土壤矿物质或微生物的相互作用。PyC与水的首次相互作用决定了：PyC进入土壤剖面并经历微生物和地球化学变化的量，是否将其埋在沉积环境中并存储在景观中，或者将其运输到溪流，最终到海洋。在这里，我们假定与水文循环的这种关键的首次相互作用发生在数天至数周的时间范围内，因此取代了微生物分解作为对PyC环境持久性的主要控制。分级为4 +©2020 John Wiley＆Sons，Ltd.