Modelling multiseasonal preferential transport of dissolved organic carbon in a shallow forest soil: Equilibrium versus kinetic sorption
Modelling multiseasonal preferential transport of dissolved organic carbon in a shallow forest soil: Equilibrium versus kinetic sorption
复制标题
模拟浅层森林土壤中溶解有机碳的多季节优先输送：平衡与动力学吸附
作者：
J. Dusek;M. Dohnal;T. Vogel;A. Marx;J. Barth
土壤中溶解有机碳（DOC）转化和迁移过程的参数化是一个挑战，特别是在多变的水文条件下。在这项研究中，DOC浓度在暴雨流进行了分析与物理为基础的建模方法。应用一维双连续介质垂直流动和输运模型模拟了大孔森林山坡土壤在4.5年内的地下过程。微生物介导的DOC转化被认为主要取决于土壤水分和土壤温度。两个概念上不同的描述DOC吸附到土壤中进行了研究与平衡和动力学方法。为了量化与模型参数化相关的不确定性，进行了Monte Carlo分析与拉丁超立方体抽样。尽管微生物转化的复杂性，模拟的时间模式的DOC浓度在暴雨流中表现出类似的行为所反映的DOC通量。由于优先流，山坡DOC输出（5.0 ± 0.5 g C · m−2 ·年−1）高于文献中通常报道的量。整体DOC的运输在山坡的情况下，可以适当地使用平衡吸附假设。进行的分析表明，列入DOC吸附动力学描述只有轻微改善的DOC山坡出口的预测。此外，可以观察到季节性水文气候条件对山坡DOC输出的影响。减少DOC运输在一个极端温暖和干燥的夏季描述的准确性较低，从而表明在干燥条件下的DOC转化的代表性的困难。
Parameterization of transformation and transport processes of dissolved organic carbon (DOC) in soils is challenging especially under variable hydrological conditions. In this study, DOC concentrations in stormflow were analysed with a physically based modelling approach. A one‐dimensional dual‐continuum vertical flow and transport model was applied to simulate subsurface processes in a macroporous forest hillslope soil over a period of 4.5 years. Microbially mediated transformations of DOC were assumed to depend primarily on soil moisture and soil temperature. Two conceptually different descriptions of the sorption of DOC to soil were examined with equilibrium and kinetic approaches. In order to quantify the uncertainties associated with the model parameterization, Monte Carlo analyses in conjunction with Latin hypercube sampling was performed. Despite the complexity of microbial transformations, the simulated temporal patterns of DOC concentrations in stormflow showed similar behaviour to those reflected in the observed DOC fluxes. Due to preferential flow, the hillslope DOC export (5.0 ± 0.5 g C · m−2 · year−1) was higher than the amounts usually reported in the literature. Overall DOC transport in hillslope scenarios could be described appropriately using the equilibrium sorption assumption. The performed analyses showed that the inclusion of the kinetic description of DOC sorption only slightly improved the predictions of the DOC hillslope export. Moreover, influences of seasonal hydro‐climatological conditions on hillslope export of DOC could be observed. Reduced DOC transport during an extreme warm and dry summer was described with lower accuracy, thus indicating the difficulties in the representation of DOC transformations under dry conditions.
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影响因子：
4
作者：
E. Tipping;P. Chamberlain;M. Fröberg;P. Hanson;P. Jardine
通讯作者：
E. Tipping;P. Chamberlain;M. Fröberg;P. Hanson;P. Jardine
影响因子：
4
作者：
J. Dick;D. Tetzlaff;C. Birkel;C. Soulsby
通讯作者：
J. Dick;D. Tetzlaff;C. Birkel;C. Soulsby
影响因子：
6.4
作者：
J. Dusek;T. Vogel;M. Dohnal;J. Barth;M. Šanda;A. Marx;J. Jankovec
通讯作者：
J. Dusek;T. Vogel;M. Dohnal;J. Barth;M. Šanda;A. Marx;J. Jankovec
酸雨足迹高峰沉积后三十年：Uhlirska流域硫酸盐污染物的长期恢复（捷克共和国）
DOI：
10.1016/j.scitotenv.2017.04.109
发表时间：
2017
期刊：
The Science of the total environment
影响因子：
--
作者：
S. Hintze;M. Sanda;J. Jankovec;F. Oulehle;J. Dusek;T. Vogel;T. Vitvar;R. van Geldern;J. A. C. Barth
通讯作者：
J. A. C. Barth
影响因子：
11.6
作者：
Kindler, Reimo;Siemens, Jan;Kaupenjohann, Martin
通讯作者：
Kaupenjohann, Martin