A global meta‐analysis of cover crop response on soil carbon storage within a corn production system
A global meta‐analysis of cover crop response on soil carbon storage within a corn production system
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玉米生产系统内覆盖作物对土壤碳储存反应的全球荟萃分析
DOI：
10.1002/agj2.21340
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发表时间：
2023
期刊：
影响因子：
2.1
通讯作者：
Clay, David E.
中科院分区：
文献类型：
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作者：
Joshi, Deepak R.;Sieverding, Heidi L.;Xu, Hui;Kwon, Hoyoung;Wang, Michael;Clay, Sharon A;Johnson, Jane M.;Thapa, Resham;Westhoff, Shaina;Clay, David E.
通过影响土壤有机碳(SOC)，覆盖作物在塑造土壤健康以及系统的长期可持续性方面发挥了关键作用。然而，覆盖作物对土壤有机碳的影响程度取决于多种因素，包括土壤类型、气候、轮作、耕作类型、覆盖作物生长和管理年限。为了阐明这些多重因素如何影响覆盖作物对SOC的相对影响，我们对包括玉米(Zea maysL.)在内的轮作中覆盖作物的影响进行了荟萃分析。关于SOC的积累。提取了有关气候条件、土壤特性、管理和覆盖作物表现的信息，从61项同行评议研究中得出198对比较结果。在每个研究过程中，覆盖作物平均增加了7.3%的SOC(95%可信区间，4.9%-9.6%)。此外，还评估了覆盖作物引起的土壤有机碳百分比变化增加的影响，包括土壤质地、覆盖作物类型、轮作、生物量、覆盖作物持续时间、耕作措施和气候区域。我们的结果表明，目前覆盖作物的玉米生产系统每年在美国封存550万毫克有机碳，并有可能在全球范围内每年封存1.75亿毫克有机碳。这些发现可用于改进碳足迹计算，并制定以科学为基础的政策建议。总而言之，覆盖种植是一种很有希望的战略，可以固定大气中的碳，从而使玉米生产系统对不断变化的气候更具弹性。
By influencing soil organic carbon (SOC), cover crops play a key role in shaping soil health and hence the system's long‐term sustainability. However, the magnitude by which cover crops impacts SOC depends on multiple factors, including soil type, climate, crop rotation, tillage type, cover crop growth, and years under management. To elucidate how these multiple factors influence the relative impact of cover crops on SOC, we conducted a meta‐analysis on the impacts of cover crops within rotations that included corn (Zea maysL.) on SOC accumulation. Information on climatic conditions, soil characteristics, management, and cover crop performance was extracted, resulting in 198 paired comparisons from 61 peer‐reviewed studies. Over the course of each study, cover crops on average increased SOC by 7.3% (95% CI, 4.9%–9.6%). Furthermore, the impact of cover crop–induced increases in percent change SOC was evaluated across soil textures, cover crop types, crop rotations, biomass amounts, cover crop durations, tillage practices, and climatic zones. Our results suggest that current cover crop–based corn production systems are sequestering 5.5 million Mg of SOC per year in the United States and have the potential to sequester 175 million Mg SOC per year globally. These findings can be used to improve carbon footprint calculations and develop science‐based policy recommendations. Taken altogether, cover cropping is a promising strategy to sequester atmospheric C and hence make corn production systems more resilient to changing climates.