Long-term farmland abandonments remarkably increased the phytolith carbon sequestration in soil.

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Linjiao Wang, Xiang Gao, Maoyin Sheng
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引用次数: 0

Abstract

Background: Phytolith-occluded organic carbon (PhytOC) is an important mechanism of long-term stable carbon sinks in terrestrial ecosystems. Farmland abandonment is a widespread land use change in the process of urbanization and industrialization and is still ongoing. Farmland abandonment can significantly affect soil carbon cycling. To elucidate the effects of farmland abandonment on soil PhytOC accumulation, in the present study, corn fields abandoned for 0 to 30 years ago in the mountainous areas of southern China were selected as the research objects. The change trends, influencing factors, and driving mechanisms of soil PhytOC accumulation during the abandonment process were studied.

Results: The following results were obtained: (1) The range of PhytOC content and storage of the 0-15 cm soil profile for both active and abandoned corn fields was 0.39-1.49 g·kg- 1 and 0.27-0.83 t·hm- 2, respectively. (2) There was a notable enhancement in soil PhytOC accumulation as the duration of abandonment lengthened. In particular, after 30 years of abandonment, soil PhytOC accumulation rose significantly. (3) Abandonment noticeably altered the contents and ratios of soil nutrients of C, N, P and Si, along with key soil enzyme activities such as urease, sucrase, alkaline phosphatase, and catalase. (4) In the context of corn field abandonment, increase in soil PhytOC was primarily attributed to modifications in PhytOC inputs due to variations in surface vegetation cover. The impact of soil environment alterations resulting from abandonment on PhytOC decomposition was less pronounced.

Conclusions: These findings are instrumental for accurately assessing the carbon sequestration potential of farmland abandonment and for developing regional carbon management strategies based on such practices.

长期撂荒显著提高了土壤植物体固碳能力。
背景:植物岩封闭有机碳(PhytOC)是陆地生态系统长期稳定碳汇的重要机制。撂荒是城市化和工业化进程中普遍存在的土地利用变化,并仍在继续。撂荒对土壤碳循环有显著影响。为了阐明撂荒对土壤植物碳积累的影响,本研究以南方山区撂荒0 ~ 30年的玉米田为研究对象。研究了废弃过程中土壤植物碳积累的变化趋势、影响因素及驱动机制。结果:(1)耕作玉米田和废弃玉米田0 ~ 15 cm土层植物碳含量和库存量分别为0.39 ~ 1.49 g·kg- 1和0.27 ~ 0.83 t·hm- 2。(2)随着撂荒时间的延长,土壤植物碳积累显著增加。特别是在废弃30年后,土壤PhytOC积累显著增加。(3)遗弃显著改变了土壤C、N、P、Si等养分的含量和比例,影响了土壤脲酶、蔗糖酶、碱性磷酸酶和过氧化氢酶等关键酶的活性。(4)在玉米退耕的背景下,土壤PhytOC的增加主要归因于地表植被覆盖变化导致的PhytOC投入的改变。撂荒导致的土壤环境变化对植物碳分解的影响不明显。结论:这些发现有助于准确评估耕地撂荒的固碳潜力,并有助于制定基于此类实践的区域碳管理策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Carbon Balance and Management
Carbon Balance and Management Environmental Science-Management, Monitoring, Policy and Law
CiteScore
7.60
自引率
0.00%
发文量
17
审稿时长
14 weeks
期刊介绍: Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle. The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community. This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system. Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.
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