Organo-organic interactions dominantly drive soil organic carbon accrual

Organo-mineral interactions have been regarded as the primary mechanism for the stabilization of soil organic carbon (SOC) over decadal to millennial timescales, and the capacity for soil carbon (C) storage has commonly been assessed based on soil mineralogical attributes, particularly mineral surface availability. However, it remains contentious whether soil C sequestration is exclusively governed by mineral vacancies, making it challenging to accurately predict SOC dynamics. Here, through a 400-day incubation experiment using 13C-labeled organic materials in two contrasting soils (i.e., Mollisol and Ultisol), we show that despite the unsaturation of mineral surfaces in both soils, the newly incorporated C predominantly adheres to \"dirty\" mineral surfaces coated with native organic matter (OM), demonstrating the crucial role of organo-organic interactions in exogenous C sequestration. Such interactions lead to multilayered C accumulation that is not constrained by mineral vacancies, a ..., , , # Organo-organic interactions dominantly drive soil organic carbon accrual This README file was generated on 2024-01-12 by Jie Kang. This dataset supports the findings reported in Kang, J., Qu, C., Chen, W., Cai, P.,Chen, C., & Huang, Q. (2024). Organo–organic interactions dominantly drive soil organic carbon accrual. Global Change Biology, 30, e17147. . ## Data descriptions by sheet: #### Sheet1 - General description #### MAOC - Mineral-associated organic carbon 1. Unit: g kg-1. 2. *MAOC source* -- MAOC fraction derived from exogenous carbon (new) or endogenous carbon (native). While the total MAOC is the sum of new MAOC and native-MAOC. 3. *Soil type* -- Mollisol and Ultisol used in the study. 4. *Treatment* -- Whether the soil sample is unamended (control) or amended with straw or glucose. 5. *Mean & SD* -- Mean values and standard deviation (n = 3). #### MNC - Microbial necromass carbon 1. Unit: g kg-1. 2. *MNC source* -- MNC fraction derived from fungal nec...矿质-有机相互作用被认为是百年至千年尺度下土壤有机碳（Soil Organic Carbon, SOC）稳定的核心机制，而土壤碳（C）固存能力通常基于土壤矿物学属性，尤其是矿物表面可及性进行评估。然而，土壤碳固存是否仅由矿物空位调控，这一问题仍存在争议，这也给精准预测土壤有机碳动态带来了挑战。本研究通过在两种不同类型土壤（即软土（Mollisol）和老成土（Ultisol））中开展为期400天的¹³C标记有机物料培养试验，结果表明：尽管两种土壤的矿物表面均未达到饱和状态，但新输入的碳主要优先附着于被本土有机质（organic matter, OM）包覆的“污化”矿物表面，由此证明了有机-有机相互作用在外源碳固存过程中的关键作用。此类相互作用可形成不受矿物空位限制的多层碳累积过程，…… # 有机-有机相互作用主导土壤有机碳累积 本README文件由康杰于2024年1月12日生成。 本数据集支撑康杰、曲畅、陈威、蔡鹏、陈晨、黄巧云（2024）发表的研究成果：《Organo-organic interactions dominantly drive soil organic carbon accrual》，发表于*Global Change Biology*，30卷，e17147号。 按工作表的数据说明： #### 工作表1 - 概况说明 #### MAOC - 矿物结合态有机碳（Mineral-associated organic carbon） 1. 单位：g kg⁻¹。 2. *MAOC来源* -- MAOC组分可分为外源碳（新输入碳）和内源碳（本土碳）两类；总MAOC为新输入MAOC与本土MAOC之和。 3. *土壤类型* -- 本研究使用的软土（Mollisol）与老成土（Ultisol）。 4. *处理方式* -- 土壤样品是否为未添加物料的对照（control），或是添加秸秆或葡萄糖的处理组。 5. *均值与标准差* -- 平均值与标准差（重复次数n=3）。 #### MNC - 微生物残体碳（Microbial necromass carbon） 1. 单位：g kg⁻¹。 2. *MNC来源* -- MNC组分源自真菌残……