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东祁连山退化高寒草地土壤细菌群落与土壤环境因子间的相互关系
引用本文:李海云,姚拓,张建贵,高亚敏,马亚春,路晓雯,张慧荣,杨晓蕾. 东祁连山退化高寒草地土壤细菌群落与土壤环境因子间的相互关系[J]. 生态学杂志, 2018, 29(11): 3793-3801. DOI: 10.13287/j.1001-9332.201811.037
作者姓名:李海云  姚拓  张建贵  高亚敏  马亚春  路晓雯  张慧荣  杨晓蕾
作者单位:甘肃农业大学草业学院,草业生态系统教育部重点实验室, 兰州 730070
基金项目:本文由国家自然科学基金项目(31660688)资助
摘    要:为探究东祁连山不同退化高寒草地细菌群落分布特征与土壤环境因子间的相互关系,采用高通量测序技术对轻度、中度和重度退化草地的土壤细菌群落结构变化及其多样性进行分析,运用CANOCO 4.5软件对土壤细菌群落与土壤环境因子间关系进行冗余分析(RDA).结果表明:不同退化高寒草地土壤理化性质间均差异显著,高通量测序共得到257125条有效序列,180826条优质序列,4790个OTUs.细菌群落Chao1指数依次为轻度>中度>重度;Shannon指数依次为轻度>重度>中度.系统发育分析表明,各样地土壤细菌类群分属于33个门,其中放线菌门、变形菌门和厚壁菌门是3种不同退化草地土壤中的优势类群.对不同退化草地土壤细菌各门所占比例分析发现,放线菌门、酸杆菌门和变形菌门随着退化程度加剧先减少后增加,厚壁菌门反之.RDA分析结果显示,细菌优势类群与蔗糖酶、纤维素酶和磷酸酶呈极显著相关,与pH、电导率、速效氮、速效钾呈显著相关.说明东祁连山不同退化高寒草地土壤细菌群落间差异明显,土壤环境因子是影响土壤细菌群落分布的重要因素.

关 键 词:东祁连山  退化草地  细菌群落结构  高通量测序  土壤环境因子  冗余分析
收稿时间:2018-01-22

Relationship between soil bacterial community and environmental factors in the degraded alpine grassland of eastern Qilian Mountains,China
LI Hai-yun,YAO Tuo,ZHANG Jian-gui,GAO Ya-min,MA Ya-chun,LU Xiao-wen,ZHANG Hui-rong,YANG Xiao-lei. Relationship between soil bacterial community and environmental factors in the degraded alpine grassland of eastern Qilian Mountains,China[J]. Chinese Journal of Ecology, 2018, 29(11): 3793-3801. DOI: 10.13287/j.1001-9332.201811.037
Authors:LI Hai-yun  YAO Tuo  ZHANG Jian-gui  GAO Ya-min  MA Ya-chun  LU Xiao-wen  ZHANG Hui-rong  YANG Xiao-lei
Affiliation:Ministry of Education Key Laboratory of Grassland Ecosystem, College of Prataculture, Gansu Agricultural University, Lanzhou 730070, China
Abstract:To explore the distribution of bacterial community and its relationship with soil environmental factors in degraded alpine grasslands in the eastern Qilian Mountains, we analyzed the changes of bacterial community structure and diversity across lightly, moderately and severely degraded grasslands by using high-throughput sequencing technology. Redundancy analysis (RDA) was performed to analyze the relationship between soil bacterial communities and soil environmental factors by using CANOCO 4.5 software. The results showed that there were significant differences in soil physicochemical properties among different degraded alpine grasslands. There were 257125 effective sequences, 180826 high-quality sequences and 4790 OTUs. The Chao1 index was lightly degraded grassland > moderately degraded grassland > severely degraded grassland; Shannon index was lightly degraded grassland > severely degraded grassland > moderately degraded grassland. Phylogenetic analysis indicated that the soil bacterial groups of each plot belonged to 33 phyla, with Actinomycetes, Proteobacteria and Firmicutes being the dominant groups in the three grasslands. From analysis of the proportion of soil bacteria in different degraded grassland, we found that the Actinomycetes, Acidobacteria and Proteobacteria increased first and then decreased with the degree of degradation, and the Firmicutes showed an opposite trend. The results of RDA analysis showed that the dominant groups of bacteria were significantly correlated with invertase, cellulase, phosphatas, pH, electronic conductivity, available nitrogen and available potassium. It was concluded that there were significant differences in soil bacterial communities among different degraded alpine grasslands in the eastern Qilian Mountains, and the soil environmental factors were the important factors driving the distribution of soil bacterial communities.
Keywords:eastern Qilian Mountains  degraded grassland  bacterial community structure  high-throughput sequencing technology  soil environmental factor  redundancy analysis
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