文献类型：期刊文献

英文题名：Soil bacterial habitat generalists strengthen depth-dependent organic carbon accrual in coastal reclaimed lands after afforestation

作者：Cheng, Xiangrong[1] Zhang, Yulin[1] Xing, Wenli[1]

第一作者：成向荣

通信作者：Cheng, XR[1]

机构：[1]Chinese Acad Forestry, Inst Subtrop Forestry, East China Coastal Forest Ecosyst Res Stn, Hangzhou 311400, Zhejiang, Peoples R China

年份：2024

卷号：234

外文期刊名：CATENA

收录：;Scopus(收录号：2-s2.0-85173880344);WOS:【SCI-EXPANDED(收录号:WOS:001092601800001)】；

基金：This study was supported by the National Natural Science Founda-tion of China (Grant No. 31870596) .

语种：英文

外文关键词：Soil aggregate; Soil organic carbon; Bacterial diversity; Bacterial community composition; Habitat-specific species

摘要：The microbially driven soil organic carbon (SOC) turnover and accrual at the aggregate scale are crucial to reveal potential SOC sequestration and stabilization. However, information about how afforestation in reclaimed lands influences the bacterial contribution to SOC within soil aggregates remains unclear. Here, we investigated the bacterial taxonomic and functional composition and habitat associations of species (i.e., generalists and specialists) in different aggregates. Soil aggregates were isolated using an optimal soil moisture method. Bacterial taxonomic and functional composition were determined using high-throughput sequencing and PICRUSt2, respectively. We evaluated the effect of bacterial traits on SOC accrual within aggregates along the soil profile in unreclaimed tideland and two poplar plantations at different stages of reclamation (i.e., reclaimed 24 and 64 years prior to data collection) in East China. The bacterial traits and SOC concentration did not differ significantly among different-sized aggregates and that bacterial alpha diversity and SOC within aggregates increased with reclamation time, but this was only pronounced in surface soil. The relative abundance of generalists increased, specialists decreased in the soil profile with reclamation time, and the magnitude of variation declined with soil depth. The random forest model and variation partitioning analysis confirmed that generalists and specialists dominated the variation in SOC. Moreover, some subgroups from Proteobacteria, Acidobacteria, Actinobacteria, and Chloroflexi phyla were rich in generalists and may play crucial roles in SOC accrual. These findings suggest that the bacterial traits and SOC in coastal coarse-textured soil were not affected by aggregate sizes and might rely on other aggregate attributes (e.g., stability). Furthermore, SOC accrual was strongly affected by an increase in habitat generalists. We provide new insights into the variation pattern in SOC and bacterial traits at the aggregate scale and illustrate that bacterial generalists have the greatest impact on SOC accrual in coastal reclaimed lands after afforestation.