亚热带作物系统的农业集约化及其在土壤中固碳的潜力

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
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引用次数: 0

摘要

土壤是地球上第三大碳库。这凸显了土壤固碳作为减缓全球气候变化的一项重要战略的重要性,尤其是在农业基础雄厚的国家。大量研究证明了保护性农业在固碳方面的有效性。然而,人们对集约化和多样化作物系统如何影响 SOC 动态却知之甚少。作物集约化、多样化和碳储存之间的关系错综复杂,并取决于作物品种、管理方法、当地气候和土壤条件等因素。本研究在巴西东南部进行,调查了作物集约化和多样化系统对 SOC 固碳的影响,并评估了目前使用 Century 模型预测 SOC 增加的能力。我们发现,从 2020 年到 2022 年,作物系统集约化促进了 SOC 的增加,尤其是在冬季与包括豆科植物和黄铜茎植物在内的多样化作物相关联时(从 54.76 兆克/公顷增加到 56.66 兆克/公顷)。虽然各系统在统计上没有差异,但各系统之间的平均差异在逐年扩大(从较低强度到较高强度和多样化系统,从 0.7 兆克/公顷-1 到 4.1 兆克/公顷-1),实验周期短可能是造成这些结果的原因之一。预测结果高估了低强度系统的 SOC 增长率,低估了高强度系统的 SOC 增长率。在亚热带土壤矿物(如铁和铝氧化物)中稳定 SOC 的未来模型的调整可能会缩小这一预测差距。我们的研究也有助于当前关于土壤碳动态及其在减缓气候变化中的关键作用的讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Agriculture intensification in subtropical crop systems and its potential to sequester carbon in soils
Soils are the third largest carbon pool on Earth. This underscores the significance of soil carbon sequestration as a prominent strategy for global climate change mitigation, especially in countries with strong agricultural backgrounds. Numerous studies have demonstrated the effectiveness of conservation agriculture in SOC sequestration. However, little is known about how intensified and diversified crop systems affect SOC dynamics. The relationship between crop intensification, diversification and carbon storage is intricate and context-dependent, contingent upon factors such as crop varieties, management practices, local climate, and soil conditions. This study, conducted in Southeastern Brazil, investigates the impact of crop intensification and diversification systems on SOC sequestration and assesses the current capacity to predict SOC increase using Century model. We found that crop system intensification promoted SOC increase from 2020 to 2022, especially when associated with diversification including legumes and brassicas during the winter (from 54.76 to 56.66 Mg ha−1). Although the systems do not differ statistically, the difference average between systems is growing yearly (from 0.7 to 4.1 Mg ha−1 from less to more intensified and diversified system), the experiment’s short period can be a reason for these findings. The predications overestimated SOC increase rate for less intensified systems and underestimated SOC increase rates for more intensified systems. Adjustments in future models regarding SOC stabilization in subtropical soils minerals like Fe and Al oxides may reduce this prediction gap. Our study also contributes to the ongoing discussion on soil carbon dynamics and its pivotal role in mitigating climate change.
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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.
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