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Soil properties rather than climate and ecosystem type control the vertical variations of soil organic carbon, microbial carbon, and microbial quotient
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.soilbio.2020.107905
Tingting Sun , Yugang Wang , Dafeng Hui , Xin Jing , Wenting Feng

Small changes in soil organic carbon (SOC) may have great influences on the climate-carbon (C) cycling feedback. However, there are large uncertainties in predicting the dynamics of SOC in soil profiles at the global scale, especially on the role of soil microbial biomass in regulating the vertical distribution of SOC. Here, we developed a database of soil microbial biomass carbon (SMBC), SOC, and soil microbial quotient (SMQ = SMBC/SOC) from 289 soil profiles globally, as well as climate, ecosystem types, and edaphic factors associated with these soil profiles. We assessed the vertical distribution patterns of SMBC and SMQ and the contributions of climate, ecosystem type, and edaphic condition to their vertical patterns. Our results showed that SMBC and SMQ decreased exponentially with soil depth, especially within the 0–40 cm soil depth. SOC also decreased exponentially with depth but in different magnitudes compared to SMBC and SMQ. Edaphic factors (e.g., soil clay content and C/N ratio) had the strongest control on the vertical distributions of SMBC and SMQ, probably by mediating substrate and nutrient supplies for microbial growth in soils. Mean annual temperature and ecosystem types (i.e., forests, grasslands, and croplands) had weak influences on SMBC and SMQ. In contrast, the vertical distribution of SOC was significantly affected by climate and edaphic factors. Climate and ecosystem types likely simultaneously affected multiple factors that control SMBC, such as the distribution of soil clay and nutrients along soil profiles. Overall, our data synthesis provides quantitative information of how SMBC, SMQ, and SOC changed along soil profiles at large spatial scales and identifies important factors that influence their vertical distributions. The findings can help improve the prediction of C cycling in terrestrial ecosystems by incorporating the contribution of soil microbes in Earth system models.



中文翻译:

土壤属性而非气候和生态系统类型控制着土壤有机碳,微生物碳和微生物商的垂直变化

土壤有机碳(SOC)的微小变化可能会对气候-碳(C)循环反馈产生重大影响。但是,在全球范围内预测土壤剖面中SOC的动态方面存在很大的不确定性,尤其是在土壤微生物量在调节SOC垂直分布中的作用方面。在这里,我们从全球289个土壤剖面中开发了土壤微生物生物量碳(SMBC),SOC和土壤微生物商(SMQ = SMBC / SOC)以及与这些土壤剖面相关的气候,生态系统类型和土壤因子的数据库。我们评估了SMBC和SMQ的垂直分布模式以及气候,生态系统类型和水生条件对其垂直模式的贡献。我们的结果表明,SMBC和SMQ随土壤深度呈指数下降,特别是在0-40 cm的土壤深度内。与SMBC和SMQ相比,SOC也随深度呈指数下降,但幅度不同。深度因素(例如,土壤黏土含量和碳氮比)对SMBC和SMQ的垂直分布的控制最强,可能是通过调节土壤微生物生长的基质和养分供应。年平均温度和生态系统类型((森林,草原和农田)对SMBC和SMQ的影响较弱。相比之下,SOC的垂直分布受到气候和水文因素的显着影响。气候和生态系统类型可能同时影响控制SMBC的多个因素,例如土壤黏土和养分在土壤剖面中的分布。总体而言,我们的数据综合提供了SMBC,SMQ和SOC在大空间范围内沿土壤剖面如何变化的定量信息,并确定了影响其垂直分布的重要因素。通过将土壤微生物的贡献纳入地球系统模型,这些发现可以帮助改善对陆地生态系统碳循环的预测。

更新日期:2020-06-26
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