Page 34 - 《广西植物》2025年第6期
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1 0 2 0                                广  西  植  物                                         45 卷
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                      LI Jiqiong ꎬ LEI Yanting ꎬ JIANG Xingyu ꎬ LI Rui ꎬ LAN Jiacheng
               ( 1. School of Geography and Environmental Sciencesꎬ Guizhou Normal Universityꎬ Guiyang 550025ꎬ Chinaꎻ 2. Karst Research Institute of
                            Guizhou Normal University/ National Karst Rocky Desertification Prevention and Control Engineering
                                          Technology Research Centerꎬ Guiyang 550025ꎬ China )

                 Abstract: To explore the effects of vegetation restoration on the structure of soil microbial communitiesꎬ the variation in
                 soil organic carbon componentsꎬ and the interaction between microbes and organic carbon in karst plateau canyonsꎬ soils
                 were collected from 0 to 20 cm depth in cropland (control) and under typical vegetation restoration (Zanthoxylum
                 bungeanum and natural secondary forests) in Guizhou karst plateau canyons. The contents of soil organic carbon and its
                 components and the composition and diversity of microbial communities were determined. Changes in soil organic carbon
                 and its componentsꎬ microbial diversityꎬ and community composition after vegetation restoration were investigated. The
                 relationships between soil organic carbon components and microbial taxa were analyzed. The results were as follows:
                 (1) Vegetation restoration significantly increased the contents of soil organic carbon and its componentsꎬ particularly in
                 the 0-10 cm soil layer compared with the 10-20 cm layer (P<0.05). (2) Vegetation restoration significantly altered β
                 diversity and relative abundance of soil microbial speciesꎬ although no significant change was observed in α
                 diversity. (3) The dominant bacterial phyla in all samples were unclassified_k __norank_d __Bacteriaꎬ Actinobacteriotaꎬ
                 Proteobacteriaꎬ and Acidobacteriotaꎬ and the main fungal phyla were Ascomycotaꎬ unclassified _ k __ Fungiꎬ
                 Basidiomycotaꎬ and Mortierellomycota. (4) Bacteria closely related to soil organic carbon and its components mainly
                 included Asanoaꎬ norank _ f __ 67 ̄14ꎬ Solirubrobacterꎬ norank _ f __ Ilumatobacteraceaeꎬ and Streptomyces from
                 Actinobacteriota and unclassified _p __Ascomycotaꎬ Setophaeosphaeriaꎬ unclassified _o __Helotialesꎬ unclassified _o __
                 Pleosporalesꎬ Cladosporiumꎬ Setophomaꎬ unclassified _o __Sordarialesꎬ Metarhiziumꎬ Codinaeaꎬ and Exophiala from
                 Ascomycota. The results show that vegetation restoration in karst rocky desertification control can promote the
                 accumulation of soil organic carbon and change the microbial communityꎬ among whichꎬ Actinobacteriota and
                 Ascomycota are key species affecting changes in soil organic carbon and its components.
                 Key words: karst soilꎬ karst rocky desertificationꎬ vegetation restorationꎬ soil organic carbonꎬ soil microorganism



                土壤有机碳库是地球表层系统中最具有活性                            生物的相互关系ꎮ 土壤微生物对 SOC 动态具有重
            的生态碳库之一ꎬ对维持陆地生态系统的碳平衡                              要影响( 李研妮ꎬ2023ꎻ薛志婧等ꎬ2023)ꎮ 微生物

            具有重要作用( 李龙等ꎬ2014ꎻ刘林馨等ꎬ2018)ꎮ                       群落组成和丰度因植被恢复而发生的变化可能会
            土壤有机碳(soil organic carbonꎬ SOC) 根据其稳定              对土壤碳组分具有重要影响ꎬ反之ꎬ土壤碳组分也

            程度可以分为活性有机碳和惰性有机碳( Patton et                       会影响土壤微生物群落结构ꎮ 因此ꎬ迫切需要清
            al.ꎬ1987)ꎮ 活性有机碳对土壤环境变化的响应极                        楚地了解植被恢复后土壤微生物群落与 SOC 及组
            为敏感ꎬ易氧化分解(向慧敏等ꎬ2015)ꎮ 已有研究                         分的关系ꎮ
            探讨了植被恢复对 SOC 及组分变化的影响( 李正                              微生物的个体活性直接影响土壤碳的周转ꎬ
            才ꎬ2006ꎻ白义鑫等ꎬ2020ꎻ罗娜娜等ꎬ 2023ꎻ张穗                     微生物群落结构是生态系统健康和可持续性的重
            粒等ꎬ2023)ꎮ 然而ꎬ植被恢复对 SOC 及组分的影                       要指标(Lewis et al.ꎬ2010)ꎬ植被恢复会影响土壤
            响方向和幅度存在不一致ꎬ具有相当大的不确定                              微生物群落的变化ꎬ改善土壤生态系统的能量循
            性ꎮ 植被恢复显著减少( Rong et al.ꎬ 2020)、增加                 环现状ꎬ进而影响土壤生态系统的稳定性( Xu &

            (Deng et al.ꎬ 2016 ) 或 没 有 改 变 ( Chen et al.ꎬ      Wangꎬ 2014ꎻ Qiu et al.ꎬ 2020)ꎮ 土地利用变化会
            2017)SOC 含量ꎮ 这可能与植被恢复后的各种生                         引起微生物和 SOC 的变化ꎬ然而不同土地利用下
            物和微生物因素ꎬ如土壤深度、植被类型( Xiao et                        土壤微生物是否影响 SOC 及组分的动态仍存在不
            al.ꎬ 2021)、 SOC 组 分 的 变 化 ( Schwendenmann &        确定性ꎮ 植被恢复增加土壤碳的输入ꎬ土壤碳的
            Pendallꎬ 2006)及其与酶活性( 罗娜娜等ꎬ2023) 微                 大量增加可以促进土壤微生物生长或改变微生物
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