Chen Ying, Qin Wenkuan, Zhang Qiufang, Wang Xudong, Feng Jiguang, Han Mengguang, Hou Yanhui, Zhao Hongyang, Zhang Zhenhua, He Jin-Sheng, Torn Margaret S, Zhu Biao
Institute of Ecology and Ministry of Education Key Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.
Qinghai Haibei National Field Research Station of Alpine Grassland Ecosystem and Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810008, China.
Nat Commun. 2024 May 27;15(1):4489. doi: 10.1038/s41467-024-48736-w.
The sensitivity of soil organic carbon (SOC) decomposition in seasonally frozen soils, such as alpine ecosystems, to climate warming is a major uncertainty in global carbon cycling. Here we measure soil CO emission during four years (2018-2021) from the whole-soil warming experiment (4 °C for the top 1 m) in an alpine grassland ecosystem. We find that whole-soil warming stimulates total and SOC-derived CO efflux by 26% and 37%, respectively, but has a minor effect on root-derived CO efflux. Moreover, experimental warming only promotes total soil CO efflux by 7-8% on average in the meta-analysis across all grasslands or alpine grasslands globally (none of these experiments were whole-soil warming). We show that whole-soil warming has a much stronger effect on soil carbon emission in the alpine grassland ecosystem than what was reported in previous warming experiments, most of which only heat surface soils.
在季节性冻土（如高山生态系统）中，土壤有机碳（SOC）分解对气候变暖的敏感性是全球碳循环中的一个主要不确定因素。在此，我们测量了一个高山草原生态系统中全土层变暖实验（表层1米土壤温度升高4°C）在四年（2018 - 2021年）期间的土壤CO排放情况。我们发现，全土层变暖分别使总CO排放通量和源自SOC的CO排放通量增加了26%和37%，但对源自根系的CO排放通量影响较小。此外，在全球所有草原或高山草原的荟萃分析中，实验性变暖平均仅使土壤总CO排放通量增加7 - 8%（这些实验均不是全土层变暖实验）。我们表明，全土层变暖对高山草原生态系统土壤碳排放的影响比以往大多数仅加热表层土壤的变暖实验所报告的要强得多。
