不受保护的碳占主导地位 十年来土壤碳增加
Minglong Liu1, Shilu Zheng1, Elise Pendall2
1State Key Laboratory of Wetland Conservation and Restoration, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China.
Nature communications
|February 26, 2025
概括
全球土壤有机碳 (SOC) 储存量从2000年至2022年增加,主要是有机碳颗粒 (POC). 然而,由于气候变化和人类活动导致SOC稳定性下降,需要针对性战略,重点关注POC.
科学领域:
- 土壤科学 土壤科学
- 环境科学 环境科学
- 生态生态学 生态生态学
背景情况:
- 土壤有机碳 (SOC) 分数,有机颗粒碳 (POC) 和与矿物相关的有机碳 (MAOC),影响SOC的储存和稳定性.
- 了解这些分量的变化对于土壤碳捕获和气候变化缓解至关重要.
研究的目的:
- 分析2000年至2022年SOC分数 (POC和MAOC) 的全球趋势.
- 评估土地管理实践对 SOC 分数和整体 SOC 储存的影响.
- 确定推动SOC稳定性变化的关键因素.
主要方法:
- 来自六大洲7219个土壤样本的全球SOC分数数据集的编制.
- 统计分析了POC和MAOC随着时间的推移而发生的变化及其与土地利用和管理的关系.
主要成果:
- 在2000年至2022年期间,全球SOC储存增加了11.0%,主要是由于POC增加了21.8%.
- MAOC下降了5.3%,导致POC/MAOC比率上升了29.1%,表明SOC稳定性降低.
- 在密集管理下的种植森林,牧草草地和耕地中,SOC下降,主要是由于POC损失.
结论:
- 虽然全球SOC储存量正在增加,但这主要是由于不稳定的POC,它更容易受到环境变化的影响.
- 越来越少的SOC稳定性,由不断上升的POC/MAOC比率证明,在气候变化和密集土地利用下带来风险.
- 专注于保护和增强POC的有针对性的战略对于保持土壤碳汇是必不可少的.
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