据了解，人们对土壤无机碳(SIC)的规模、分布和脆弱性的全球估计在很大程度上仍未被量化。
研究通过编译223,593个实地测量数据，以开发机器学习模型，结果显示，全球土壤在地表2米深度上以SIC形式储存了2305±636(±1SD)亿吨碳。在未来的情景中，与陆地生态系统氮添加相关的土壤酸化，将在未来30年内减少全球SIC(0.3米)高达230亿吨的碳，其中印度和中国受影响最大。
研究人员对现今陆地-水碳存量和内陆水碳酸盐化学的综合研究表明，每年至少有1.13±3.3亿吨无机碳通过土壤流失到内陆水域中，对大气和水圈碳动态产生了巨大但被忽略的影响。
附：英文原文
Title: Size, distribution, and vulnerability of the global soil inorganic carbon
Author: Yuanyuan Huang, Xiaodong Song, Ying-Ping Wang, Josep G. Canadell, Yiqi Luo, Philippe Ciais, Anping Chen, Songbai Hong, Yugang Wang, Feng Tao, Wei Li, Yiming Xu, Reza Mirzaeitalarposhti, Heba Elbasiouny, Igor Savin, Dmitry Shchepashchenko, Raphael A. Viscarra Rossel, Daniel S. Goll, Jinfeng Chang, Benjamin Z. Houlton, Huayong Wu, Fei Yang, Xiaoming Feng, Yongzhe Chen, Yu Liu, Shuli Niu, Gan-Lin Zhang
Issue&Volume: 2024-04-12
Abstract: Global estimates of the size, distribution, and vulnerability of soil inorganic carbon (SIC) remain largely unquantified. By compiling 223,593 field-based measurements and developing machine-learning models, we report that global soils store 2305 ± 636 (±1 SD) billion tonnes of carbon as SIC over the top 2-meter depth. Under future scenarios, soil acidification associated with nitrogen additions to terrestrial ecosystems will reduce global SIC (0.3 meters) up to 23 billion tonnes of carbon over the next 30 years, with India and China being the most affected. Our synthesis of present-day land-water carbon inventories and inland-water carbonate chemistry reveals that at least 1.13 ± 0.33 billion tonnes of inorganic carbon is lost to inland-waters through soils annually, resulting in large but overlooked impacts on atmospheric and hydrospheric carbon dynamics.
DOI: adi7918
Source: https://www.science.org/doi/10.1126/science.adi7918