Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (5): 1410-1419.DOI: 10.11733/j.issn.1007-0435.2024.05.011

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Characteristics and Influencing Factors of Soil Bacterial Communities in Subshrub Encroachment Grasslands

GUO Qian1,2, WANG Bo1, FAN Yong-ming3, LU Xue-jiao1, QIN Bei-ling1, WEN Zhong-ming4, LI Wei5   

  1. 1. School of Agriculture and Bioengineering, Longdong Univerisity, Qingyang, Gansu Province 745000, China;
    2. Gansu Key Laboratory of Protection and Utilization for Biological Resources and Ecological Restoration, Qingyang, Gansu Province 745000, China;
    3. Central South Academy of Inventory and Planning of NFGA, Changsha, Hunan Province 410014, China;
    4. College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
    5. College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province 712100, China
  • Received:2023-10-24 Revised:2023-12-05 Published:2024-06-01

半灌木扩张草原土壤细菌群落特征及其影响因素

郭倩1,2, 王博1, 樊勇明3, 路雪娇1, 覃蓓玲1, 温仲明4, 李伟5   

  1. 1. 陇东学院农业与生物工程学院, 甘肃 庆阳 745000;
    2. 甘肃省陇东生物资源保护利用与生态修复重点实验室, 甘肃 庆阳 745000;
    3. 国家林业和草原局中南调查规划院, 湖南 长沙 410014;
    4. 西北农林科技大学草业与草原学院, 陕西 杨凌 712100;
    5. 西北农林科技大学水土保持科学与工程学院, 陕西 杨凌 712100
  • 作者简介:郭倩(1992-)，女，汉族，甘肃庆阳人，博士，副教授，主要从事草地生态学研究,E-mail:Guoqian18@nwafu.edu.cn
  • 基金资助:
    国家重点研发计划课题(2022YFF1302800);陇东学院博士基金(XYBYZK2217);国家自然科学基金项目(42277464);陕西省重点研发项目(2024SF-YBXM-545)资助

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Abstract: Subshrub encroachment occurs frequently in arid and semi-arid grasslands,and significantly alters the above and belowground processes. However,the effects of the subshrub encroachment process on soil microbial communities are poorly understood on the Loess Plateau. Therefore,we assessed the changes in soil properties and bacterial communities,and their association in grasslands subjected to different subshrub (Artemisia sacrorum) encroachment intensities (light,moderate,and heavy). Our results showed that moderate and heavy subshrub encroachment grasslands had fertile-island effect,that was,moderate and heavy subshrub encroachment significantly increased soil organic carbon,total nitrogen,alkali-hydrolyzed nitrogen,total phosphorus,available phosphorus and soil water content (P<0.01). Subshrub encroachment altered the composition of soil bacterial communities (OTUs level),and heavy subshrub encroachment significantly increased the α-diversity of soil bacterial communities (P<0.01) and Shannon,Chao1 and ACE indices increased by 1.47%~1.80%,4.62%~6.77% and 4.39%~6.82%,respectively. The results of correlation analysis showed that the relative abundance of soil bacterial dominance phylum and diversity were significantly correlated with soil properties. Redundancy analysis further showed that the contents of soil alkali-hydrolytic nitrogen,total nitrogen,water,organic carbon and total phosphorus were the key factors affecting the composition of soil bacterial community,and the explanatory variance of soil bacterial community composition difference was 39.04%. Overall,the results of this study improved our understanding of the processes underlying the alterations in the soil bacterial community by subshrub encroachment in Loess Plateau.

Key words: Subshrub encroachment, Soil bacterial community, Artemisia sacrorum, Fertile-island effect

摘要： 半灌木扩张频繁发生在干旱半干旱草地中，显著改变了地上/地下过程。然而，黄土高原半灌木扩张过程对土壤微生物群落的影响尚不清楚。因此，本文研究了不同半灌木(白莲蒿Artemisia sacroorum)扩张强度(轻度、中度和重度)草地的土壤性质和细菌群落变化及其相互关系。结果表明，中度和重度半灌木扩张草地具有沃岛效应，即中度和重度半灌木扩张显著提高了土壤有机碳、全氮、碱解氮、全磷、有效磷和土壤水分含量(P<0.01)。半灌木扩张改变土壤细菌群落组成(OTUs水平)，重度半灌木扩张显著增加土壤细菌群落α-多样性(P<0.01)，Shannon，Chao1和ACE指数分别增加1.47%~1.80%，4.62%~6.77%和4.39%~6.82%。相关分析结果表明，土壤细菌优势门相对丰度和细菌群落多样性与土壤性质显著相关。冗余分析进一步表明，土壤碱解氮、全氮、水分、有机碳和全磷含量是影响土壤细菌群落组成的关键因子，对土壤群落组成差异的解释方差为39.04%。总体而言，本研究结果提高了我们对黄土高原半灌木扩张影响下土壤细菌群落变化过程的认识。

关键词: 半灌木扩张, 土壤细菌群落, 白莲蒿, 沃岛效应

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