Dynamics of bacterial community in litter and soil along a chronosequence of Robinia pseudoacacia plantations

被引：51
作者：
Xu, Miaoping [1 ,2 ]
Lu, Xuqiao [1 ,2 ]
Xu, Yadong [1 ,2 ]
Zhong, Zekun [1 ,2 ]
Zhang, Wei [1 ,2 ]
Ren, Chengjie [1 ,2 ]
Han, Xinhui [1 ,2 ]
Yang, Gaihe [1 ,2 ]
Feng, Yongzhong [1 ,2 ]
机构：
[1] Northwest A&F Univ, Coll Agron, Yangling 712100, Shaanxi, Peoples R China
[2] Res Ctr Recycle Agr Engn & Technol Shaanxi Prov, Yangling 712100, Shaanxi, Peoples R China
来源：
SCIENCE OF THE TOTAL ENVIRONMENT | 2020年 / 703卷
基金：
中国国家自然科学基金;
关键词：
Succession; Robinia pseudoacacia; Bacterial community; Vegetation flora; Litter; Soil; MICROBIAL COMMUNITY; LOESS PLATEAU; LEAF-LITTER; CARBON MINERALIZATION; ENZYME-ACTIVITIES; NITROGEN; LAND; AFFORESTATION; DIVERSITY; STOICHIOMETRY;
D O I：
10.1016/j.scitotenv.2019.135613
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
As the driver of plantation ecosystem function, microorganisms can decompose plant residues and soil organic matter. To identify dynamics of microbial communities in litter and soil and its influence by vegetation and soil at regional scales, the plantations of Robinia pseudoacacia at different successional stages (13, 19, 29, and 44 y) was selected on the Loess Plateau. High-throughput sequencing of the 16S FRNA gene was used to examine bacterial communities in litter and soil and changes in vegetation, litter, and soil characteristics were analyzed. With increase of stand age, coverage and biomass of understory vegetation increased significantly and peaked at 44-y. Concentrations of carbon (C), nitrogen (N), and phosphorus (P) in litter and soil increased significantly, whereas pH values decreased significantly. Composition and diversity of bacterial communities in litter and soil were significantly different. Diversity and richness of litter bacterial communities were higher than that of soils. Relative abundances of Actinobacteria and Proteobacteria in litter were higher than that in soil; relative abundance of Acidobacteria exhibited the reverse trend. The diversity and richness index of vegetation significantly affected that of litter bacterial communities. Soil C/P significantly affected the Simpson and Shannon index of soil bacterial communities. The C/P and pH of litter and soil were significantly correlated with bacterial composition, primarily including Actinobacteria, Acidobacteria, and Gemmatimonadetes. Diversity of litter bacterial communities was more sensitive to the diversity and richness of vegetation flora than that of soil in the succession of R. pseudoacacia. Canopy density, vegetation, and litter and soil nutrients might directly or indirectly affect bacterial communities. Carbon, phosphorus, and pH may be critical factors influencing the composition of bacterial communities in litter and soil. (C) 2019 Elsevier B.V. All rights reserved.
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页数：10
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