Land use drives the distribution of free, physically protected, and chemically protected soil organic carbon storage at a global scale

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Global Change Biology Pub Date : 2024-09-18 DOI:10.1111/gcb.17507
Samuel J. Willard, Guopeng Liang, Savannah Adkins, Karen Foley, Jessica Murray, Bonnie Waring
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Abstract

Soil organic carbon (SOC) sequestration is increasingly emphasized as a climate mitigation solution, as scientists, policy makers, and land managers prioritize enhancing belowground C storage. To identify key underlying drivers of total SOC distributions, we compiled a global dataset of soil C stocks held in three chemical forms, reflecting different mechanisms of organic C protection: free particulate organic C (fPOC), physically protected particulate organic C (oPOC), and mineral-protected soil organic C (mSOC). In our dataset, these three SOC pools were differentially sensitive to the effects of climate, soil mineralogy, and ecosystem type, emphasizing the importance of distinguishing between physical and chemical C protection mechanisms. C stocks in all three pools varied among ecosystems: cropland soils stored the least amount in each pool, with forest and grassland soils both containing significantly more fPOC (40%–60% greater in each ecosystem) than croplands. oPOC stocks did not significantly differ from zero in croplands but were substantial in forest and grassland soils. Meanwhile, mSOC stocks were the greatest in grasslands and shrublands (90%–100% greater than croplands). In cropland soils, there were no major effects of tillage on C storage in any of the three pools, while manure addition enhanced mSOC stocks, especially when added with inorganic N. Thus, the human land use intensity in croplands appears to reduce SOC storage in all major pools, depending upon management; retaining native vegetation should be emphasized to maintain current global SOC stocks.

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土地利用在全球范围内驱动自由、物理保护和化学保护土壤有机碳储存的分布
随着科学家、政策制定者和土地管理者将加强地下碳储存作为优先事项,土壤有机碳(SOC)固存作为一种气候减缓解决方案日益受到重视。为了确定总 SOC 分布的主要基本驱动因素,我们编制了一个全球土壤碳储量数据集,该数据集反映了三种化学形式的有机碳保护机制:游离颗粒有机碳(fPOC)、物理保护颗粒有机碳(oPOC)和矿物保护土壤有机碳(mSOC)。在我们的数据集中,这三种有机碳库对气候、土壤矿物学和生态系统类型的影响具有不同的敏感性,这强调了区分物理和化学有机碳保护机制的重要性。这三个库中的碳储量因生态系统而异:耕地土壤在每个库中的储量最少,森林和草地土壤的 fPOC 储量(在每个生态系统中都比耕地高出 40%-60% )显著高于耕地。同时,草地和灌木地的 mSOC 储量最大(比耕地高出 90%-100% )。在耕地土壤中,耕作对三个碳库中任何一个的碳储量都没有重大影响,而添加粪肥则会增加 mSOC 储量,尤其是在添加无机氮时。因此,耕地中的人类土地利用强度似乎会减少所有主要碳库中的 SOC 储量,具体取决于管理情况;应强调保留本地植被,以维持当前的全球 SOC 储量。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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