Meng Xianghai, Wang Baicheng, Zhang Xingzhe, Liu Chunguang, Ji Jinghong, Hao Xiaoyu, Yang Bing, Wang Wenhui, Xu Dehai, Zhang Shuai, Wang Xiaomei, Cao Minghui, Wang Yuming
Mudanjiang Branch, Heilongjiang Academy of Agricultural Sciences, Mudanjiang 157000, China.
Heilongjiang Academy of Black Soil Conservation & Utilization, Harbin 150086, China.
Microorganisms. 2025 Feb 24;13(3):496. doi: 10.3390/microorganisms13030496.
Crop rotation enhances soil fertility and health by modulating microbial communities, with soil organic carbon (SOC) dynamics governed by aggregate-microbial interplay. To date, the effects of different crop rotations on SOC fractions and relevant bacterial communities at aggregate scales remain uncertain. Here, a 17-year field experiment was used to reveal the effects of maize monoculture (MM), soybean monoculture (SS), and maize and soybean rotation on the SOC fractions and bacterial communities. Compared with the SS treatment, only the MS treatment significantly increased the particulate organic carbon (POC) content at the aggregate scale. Nevertheless, higher mineral-associated organic carbon (MaOC) contents were observed under the MS and MM treatments than under the SS treatment. The microbial co-occurrence networks for macro- and microaggregates were divided into three main ecological clusters. The specific taxa in Cluster 1 and Cluster 2 are involved in SOC fraction turnover within macro- and microaggregates, respectively. In total, the Vicinamibacteraceae-driven Cluster 1 community dominated the MaOC turnover process within macroaggregates, whereas the Actinobacteria- and Pyrinomonadaceae-driven Cluster 2 communities changed the MaOC turnover process within microaggregates. This study strengthens our understanding of the role of the microbial community in the accumulation of SOC fractions under different crop rotation practices.
轮作通过调节微生物群落来提高土壤肥力和健康状况，土壤有机碳（SOC）动态受团聚体与微生物相互作用的控制。迄今为止，不同轮作对团聚体尺度下SOC组分和相关细菌群落的影响仍不明确。在此，通过一项为期17年的田间试验，揭示了玉米单作（MM）、大豆单作（SS）以及玉米-大豆轮作（MS）对SOC组分和细菌群落的影响。与SS处理相比，仅MS处理在团聚体尺度上显著提高了颗粒有机碳（POC）含量。然而，在MS和MM处理下观察到的与矿物相关的有机碳（MaOC）含量高于SS处理。大团聚体和微团聚体的微生物共现网络分为三个主要生态簇。簇1和簇2中的特定分类群分别参与大团聚体和微团聚体内的SOC组分周转。总体而言，由Vicinamibacteraceae驱动的簇1群落主导了大团聚体内的MaOC周转过程，而由放线菌和Pyrinomonadaceae驱动的簇2群落改变了微团聚体内的MaOC周转过程。本研究加深了我们对微生物群落在不同轮作方式下SOC组分积累中作用的理解。
