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The soil microbial carbon pump as a new concept for terrestrial carbon sequestration

Science China Earth Sciences 2021年第4期64卷 545-558页

作者： Chao LIANG Xuefeng ZHU Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

soil is a huge terrestrial carbon pool, which has higher carbon storage than the sum of atmospheric and terrestrial vegetation carbon. Small fluctuations in soil carbon pool can affect regional carbon flux and global climate change. As soil organic carbon plays key roles in soil carbon storage and sequestration, studying its composition, sources and stability mechanism is a key to deeply understand the functions of terrestrial ecosystem and how it will respond to climate changes. The recently-proposed concept of soil microbial carbon pump(MCP) emphasizes the importance of soil microbial anabolism and its contributions to soil carbon formation and stabilization, which can be applied for elucidating the source, formation and sequestration of soil organic carbon. This article elaborates MCP-mediated soil carbon sequestration mechanism and its influencing factors, as well as representative scientific questions we may explore with the soil MCP conceptual framework.

关键词： soil microbial carbon pump Entombing Effect carbon cycling soil microorganisms soil organic carbon microbial residues Amino sugars soil fauna

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Linking microbial carbon pump capacity and efficacy to soil organic carbon storage and stability under heavy metal pollution

引用

soil Ecology Letters 2023年第2期5卷 55-63页

作者： Xiao Liu Xia Xu Tian Ma Shiwei Zhou Xiaoli Bi Hongbo He Xudong Zhang Weihuan Li College of Agriculture Ludong UniversityYantai 264025China Department of Ecology Co-Innovation Center for Sustainable Forestry in Southern ChinaNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Grassland Agro-ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020China Yantai Institute of Coastal Zone Research Chinese Academy of SciencesYantai 264003China Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

Heavy metal pollution can lead to a great loss of soil organic carbon(SOC).However,the microbial mechanisms that link heavy metal pollution to SOC remain poorly understood.Here,we investigated five apple-orchard soils at different distances from a Pb-Zn smelter.After assessing the heavy metal pollution level based on Grade Ⅱ of the national soil environmental quality standard(China),we found SOC stocks and microbial carbon pump(MCP)capacity(i.e.,microbial residue carbon)under medium and heavy pollution levels were significantly lower than those under safe,cordon and light pollution levels.The structural equation model showed causality in the SOC variations linked to pollution level through MCP capacity,which could contribute 77.8% of the variance in SOC storage.This verified MCP capacity can serve as a key parameter for evaluation of SOC storage under heavy metal pollution.soil MCP efficacy,i.e.,the proportion of microbial residue carbon to SOC,also decreased under medium and heavy pollution.This suggested that,with a heavier pollution level,there was a higher rate of reduction of microbial residue carbon in soil than the rate of reduction of SOC.As MCP efficacy can be a useful assessment of SOC stability,the significantly positive relationship between MCP efficacy and clay content in correlation analysis implied that lower MCP efficacy was correlated with SOC stability under the heavier pollution level.Our study provides valuable insights to identify the mechanisms of microbially mediated C transformation processes that are influenced by heavy metal pollution in agroecosystems.

关键词： microbial residues soil microbial carbon pump carbonsequestration Heavy metals Agricultural soil

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