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中国土壤有机碳分量:空间分布,驱动因素和未来变化

Shihang Zhang¹, Xiaobing Zhou², Yusen Chen²

¹Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 610041 Chengdu, China; University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the total environment

|February 12, 2024

概括

土壤有机碳 (SOC) 分数,有机颗粒碳 (POC) 和矿物相关有机碳 (MAOC) 在中国显示出不同的空间分布和驱动因素. 气候显著影响POC密度,而土壤特性控制MAOC密度,这对气候变化下的全球碳循环产生影响.

科学领域:

土壤科学土壤科学
生态生态学生态生态学
环境科学环境科学

背景情况:

土壤有机碳 (SOC) 是一个主要的陆地碳池,对全球碳循环至关重要.
了解SOC分数,微粒有机碳 (POC) 和矿物相关有机碳 (MAOC) 是预测碳循环变化的关键.
大规模的空间分布和SOC分量的驱动因素仍未得到充分探索,特别是使用元分析和机器学习.

研究的目的:

探索中国陆地生态系统中土壤POC密度 (POCD) 和MAOCD密度 (MAOCD) 的空间分布.
确定影响POCD和MAOCD变异的主要驱动因素.
评估气候变化场景对 SOC 分数的影响.

主要方法:

对中国陆地生态系统的356项研究进行了元分析.
结合元分析和机器学习模型来分析空间分布和驱动因素.
提取和测量POCD和MAOCD的数据,以及气候,土壤和植被特性.

主要成果:

中国的POCD和MAOCD分别为3.24和2.61公斤,总库存分别为31.10和25.06公斤.
气候,土壤和植被特性解释了44.9%的POCD变化和27.2%的MAOCD变化.
年平均温度是POCD的主要驱动因素,而土壤粘土含量是MAOCD的关键.

结论:

气候变化,特别是温度上升1.5°C,显著影响POCD和MAOCD的发病率.
未来的研究应该集中在气候变化对POCD的影响上,以支持"双碳"目标.
结果为了解全球变化下的SOC分数动态和改进预测模型提供了理论基础.

关键词:

气候变化气候变化气候变化机器学习机器学习与矿物相关的有机碳有机碳颗粒物有机碳颗粒物空间分布的空间分布

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The Soil Ecosystem

The Soil Ecosystem

Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:

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The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.