耕作侵蚀是被低估的碳动态驱动因素

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE Soil & Tillage Research Pub Date : 2024-09-19 DOI:10.1016/j.still.2024.106287
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引用次数: 0

摘要

耕地土壤可在气候减缓行动中发挥重要作用,因为土壤管理会直接影响碳(C)的固存和矿化。要评估丘陵地形的固碳潜力,不仅要考虑垂直碳通量的变化(更多的碳输入和/或减少矿化),还要考虑侵蚀过程导致的横向土壤有机碳(SOC)再分布。耕作被认为是土壤易位过程的重要因素,也是 SOC 动态的调节器。然而,大多数关于 SOC 重新分布的研究重点仍然是水侵蚀。因此,本研究旨在评估耕作侵蚀对捷克共和国密集耕作黄土地区(200 公顷)C 通量的影响。研究使用水和耕作侵蚀及碳通量耦合模型 SPEROS-C 分析了六十年侵蚀/沉积对碳通量的影响,并特别关注了耕作侵蚀过程的重要性。结果表明,耕作侵蚀(TIL)是研究区域碳动态的一个重要驱动因素,尤其是在坡肩,根据模型计算,那里的 SOC 显著下降。水侵蚀(WAT)是该地区最主要的侵蚀过程。然而,模型结果显示,如果考虑到 TIL 的影响,经过 60 年的模拟,侵蚀引起的固碳潜力增加了 37%。此外,有趣的是,TIL 通过改变表土 SOC 模式,减少了监测点的总沉积量。换句话说,耕作减少了水侵蚀引起的沉积物迁移。总之,考虑到耕作侵蚀的影响被忽视,土壤侵蚀对 SOC 动态的作用发生了重大转变。基于调整农业管理以增加 SOC 固存的气候减缓措施通常与土壤保持措施相一致。我们的研究结果表明,随着侵蚀引起的碳汇效应的下降,这种适应措施的效果可能会降低。
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Tillage erosion as an underestimated driver of carbon dynamics

Arable soils may play an important role in climate mitigation actions as soil management directly affects carbon (C) sequestration and mineralisation. To evaluate the C sequestration potential in hilly terrain it is essential that not only changes in vertical C fluxes (more C input and/or reduced mineralisation), but also lateral soil organic carbon (SOC) redistribution due to erosion processes are considered. Tillage has been identified as an important contributor to soil translocation processes and a modulator of SOC dynamics. Nevertheless, the focus of most studies dealing with SOC redistribution still lies on water erosion. Therefore, the aim of this study is to assess the impact of tillage erosion on C fluxes in the intensively cultivated loess region (200 ha) in the Czech Republic. The coupled water and tillage erosion and C turnover model SPEROS-C was used to analyse the effect of six decades of erosion/deposition upon C fluxes, whereas a specific focus was set on the importance of tillage erosion processes. The results indicate that tillage erosion (TIL) is an important driver of C dynamics in the study area, especially at slope shoulders where a substantial decline in SOC was modelled. Water erosion (WAT) is the most dominant process in the region. However, the model results reveal an increase in erosion-induced C sequestration potential by 37 % after 60 years of simulation when effect of TIL is considered. Moreover, it is interesting that TIL reduced the total sediment delivery from the monitoring site via a change in topsoil SOC patterns. In other words, tillage lowered water erosion-induced sediment transport. Overall, considering the overlooked impact of tillage erosion led to a substantial shift in the role of soil erosion on SOC dynamics. The climate mitigation measures based on adapted agricultural management to increase SOC sequestration are often in-line with soil conservation measures. Our results indicate that such an adaptation might be less effective as the erosion-induced C sink effect declines.

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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
期刊最新文献
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