The contributions of soil biochemical characteristics and soil organic carbon (SOC) structure to SOC mineralization rate during forest succession on the Loess Plateau, China
The contributions of soil biochemical characteristics and soil organic carbon (SOC) structure to SOC mineralization rate during forest succession on the Loess Plateau, China
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DOI：
10.1002/ldr.4392
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发表时间：
2022-06
影响因子：
4.7
通讯作者：
Qi Zhang-;Yingyi Liu;Yongmin Liu;Hanyu Liu;Zhenjiao Zhang;Qiqian Gao;Yuanzhuo Wang;Yongzhong Feng;Gaihe Yang;C. Ren;Xinhui Han
中科院分区：
文献类型：
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作者：
Qi Zhang-;Yingyi Liu;Yongmin Liu;Hanyu Liu;Zhenjiao Zhang;Qiqian Gao;Yuanzhuo Wang;Yongzhong Feng;Gaihe Yang;C. Ren;Xinhui Han
土壤有机碳矿化是一个由微生物驱动的过程，被认为是土地恢复过程中碳流失的主要形式之一。然而，驱动有机碳矿化的有机碳结构和细菌的相互作用尚不清楚。为此，研究了黄土高原森林演替的四个阶段：(1)初级阶段白桦（Betula platyphylla， BP）；(2)过渡阶段为两个不同比例的大杨树和五台山栎混合群落（PQ1）；(3) （PQ2）和(4)晚期为五台山栎（QW）顶极群落。利用16S rRNA基因Illumina测序和傅里叶变换红外光谱（FTIR‐ATR）技术，从有机碳结构的角度阐明了森林演替过程中微生物活动对有机碳矿化的调控机制。结果表明，QW中较高的芳烃- C有助于降低有机碳矿化比（SMR）。冗余分析证实了有机碳结构与细菌之间的相互作用，发现酸性菌群与顽固性有机碳结构相关，变形菌群和拟杆菌群分别与不稳定有机碳结构相关。此外，偏最小二乘路径模型显示，土壤有机碳和碳氮比对土壤细菌群落特征有影响，酸性细菌丰度的增加和芳香化合物- C的增加降低了SMR。总的来说，这些发现强调了细菌-有机碳结构相互作用在降低SMR中的重要性，并有助于提高对森林演替如何调节碳矿化的理解。
Soil organic carbon (SOC) mineralization is a process driven by microorganisms and is considered to be one of the main forms of carbon loss in land restoration. However, the interaction of SOC structures and bacteria that drive SOC mineralization remain unclear. Therefore, four forest succession stages were investigated on the Loess Plateau of Northern China: (1) primary stage Betula platyphylla (BP); (2) transitional stage which were two mixed communities of Populus davidiana and Quercus wutaishanica with different proportions (PQ1); (3) (PQ2) and (4) the late stage was climax communities of Quercus wutaishanica (QW). The Illumina sequencing of the 16S rRNA gene and Fourier transformation infrared (FTIR‐ATR) spectroscopy were used to clarify the regulation mechanism of microbial activity on SOC mineralization during forest succession through the perspective of SOC structures. Our results indicated higher aromatics‐C in QW contributed to decreased SOC mineralization ratio (SMR). Redundancy analysis confirmed SOC structures–bacteria interaction and revealed the groups Acidobacteria correlated with recalcitrant SOC structures while Proteobacteria and Bacteroides correlated with labile SOC structures, respectively. Moreover, the partial least squares path model revealed that the SOC and C:N ratio act on soil bacteria community characteristics, and the higher abundance of Acidobacteria and the increase of aromatics‐C decreased SMR. Collectively, these findings highlight the importance of bacteria–SOC structures interaction in decreased SMR and contribute to an improved understanding of how forest succession regulates carbon mineralization.