Migration of dissolved organic carbon in the hydrological processes and driving factors on the Loess Plateau

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Catena Pub Date : 2025-03-16 DOI:10.1016/j.catena.2025.108937
Libo Ge , Zixin Zhan , Xuemei Mei , Jiawei Xie , He Li
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Abstract

Dissolved organic carbon (DOC) plays a key role in the forest carbon cycle. However, the interplay between rainfall and biotic factors in regulating the vertical and horizontal transport of DOC under long-term ecological restoration remains unclear. We selected four vegetation restoration types (P. tabulaeformis, P. orientalis, R. pseudoacacia, and mixed forest of P. orientalis and R. pseudoacacia) and one nested watershed (including six sub-watersheds) on the Loess Plateau as the focus of this research. We monitored the DOC concentrations in rainfall (BP), throughfall (TF), stemflow (SF), litter leachate (LL), and surface runoff (SR) during 12 rainfall events and quantified the input and output fluxes of DOC. In the rainy season of a dry year, the net fluxes of DOC into the soil were higher for P. tabulaeformis and mixed forests than for other vegetation types, and the values were 56.63 ± 15.46 kg ha−1 season-1 and 53.01 ± 9.11 kg ha−1 season-1, respectively. In contrast, the net DOC flux into the soil was relatively low for P. orientalis and R. pseudoacacia. The results showed that at the vertical interface, rainfall factors (rainfall amount and duration) and biotic factors (vegetation type, leaf area index, canopy density and litter decomposition layer thickness) had significant effects on the DOC migration of TF, SF and LL, and a combination of these factors explained 74 %, 87 % and 71 % of the total variance in TF, SF and LL, respectively. At the horizontal interface, the DOC concentration in runoff plots initially decreases and then increases as rainfall intensity augments, whereas in sub-watersheds, the DOC concentration exhibits an opposite trend, initially rising and subsequently decreasing. In addition, vegetation coverage was an important factor affecting the DOC migration of surface runoff. In the runoff plot, the lowest SR-output DOC flux was that of the mixed forest. Among the sub-watersheds, the lowest SR-output DOC flux occurred in the mixed forest watershed. This study is expected to provide a reference for further understanding the mechanism of DOC migration and transformation and evaluating the carbon sink effect in long-term vegetation restoration areas.
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溶解有机碳(DOC)在森林碳循环中发挥着关键作用。然而,在长期生态恢复过程中,降雨和生物因素在调节溶解有机碳垂直和水平迁移方面的相互作用仍不清楚。我们选择了黄土高原上的四种植被恢复类型(梭梭林、东方梭梭林、假梭梭林、东方梭梭林与假梭梭林混交林)和一个嵌套流域(包括六个子流域)作为研究重点。我们在 12 次降雨过程中监测了降雨(BP)、直流(TF)、干流(SF)、垃圾渗滤液(LL)和地表径流(SR)中的 DOC 浓度,并量化了 DOC 的输入和输出通量。在干旱年份的雨季,红豆杉和混交林进入土壤的 DOC 净通量高于其他植被类型,分别为 56.63 ± 15.46 kg ha-1 season-1 和 53.01 ± 9.11 kg ha-1 season-1。相比之下,东方红豆杉和红豆杉进入土壤的 DOC 净通量相对较低。结果表明,在垂直界面,降雨因子(降雨量和降雨持续时间)和生物因子(植被类型、叶面积指数、冠层密度和枯落物分解层厚度)对 TF、SF 和 LL 的 DOC 迁移有显著影响,这些因子的组合分别解释了 TF、SF 和 LL 总方差的 74%、87% 和 71%。在水平界面上,随着降雨强度的增加,径流地块中的 DOC 浓度先降低后升高,而在子流域中,DOC 浓度则呈现出相反的趋势,先升高后降低。此外,植被覆盖率也是影响地表径流 DOC 迁移的一个重要因素。在径流地块中,混交林的 SR 输出 DOC 通量最低。在各子流域中,混交林流域的 SR 输出 DOC 通量最低。本研究有望为进一步了解 DOC 迁移转化机制、评估长期植被恢复区的碳汇效应提供参考。
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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