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青海-西藏高原的全方位土壤有机碳储量远大于此前报告的

Jiajun Mao^1,2,3, Shuai Zhang^1,2,3, Mingming Wang^1,2,3

¹State Key Laboratory of Soil Pollution Control and Safety, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China.

Global change biology

|March 16, 2026

概括

青海-西藏高原拥有庞大的土壤有机碳 (SOC) 库存,超过60%的深度低于0.3米. 这种新的高分辨率地图改进了这个快速变暖的地区的碳气候反评估.

科学领域:

地球和环境科学地球和环境科学
土壤科学土壤科学
气候科学气候科学

背景情况:

青海-西藏高原 (QTP),地球的"第三极",正在以全球平均水平的近两倍的速度变暖.
关于QTP的土壤有机碳 (SOC) 库存的数量,分布和控制存在重大不确定性.
准确的SOC测绘对于理解这个脆弱地区的碳气候反至关重要.

研究的目的:

为QTP生成高分辨率,空间显式和深度分辨率的SOC库存估计.
与现有的全球和区域产品相比,提高SOC库存评估的准确性.
确定控制SOC分布在高原上的关键环境因素.

主要方法:

编制了整个QTP的2442个土壤配置文件的综合数据集.
集成的土壤数据与高分辨率 (90m) 的环境共变量.
采用机器学习模型进行SOC库存估计,并通过独立测量 (n=53) 进行验证.

主要成果:

据估计,SOC总储量在顶部2米内为62.0 Pg C,深度在0.3米以下>60%,深度在0.3米以下.
实现了高预测准确度 (R2=0.63对于表层土壤,R2=0.49对于地下土壤),显著优于现有产品.
确定气候 (当代和古气候) 作为影响SOC分布的主要因素 (>50%的差异).

结论:

该QTP储存了大量的SOC,主要是在更深层的土壤层中,超过了之前的估计.
这张高分辨率的SOC地图为评估QTP的碳气候反提供了关键的基线.
这些发现凸显了QTP因其大量的碳储量而对气候变暖的脆弱性.

关键词:

青海 - 西藏高原青海 - 西藏高原气候变化气候变化气候变化深层土壤深层土壤绘制地图,绘制地图.永久土 (Permafrost) 是一个永久土.土壤有机碳土壤有机碳空间模式的空间模式

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相关概念视频

The Carbon Cycle

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.

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: