期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 654, 期 -, 页码 264-274出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.11.031
关键词
Microbial community composition; Enzyme activity; Soil carbon fraction; Nitrogen fertilization; Grassland
资金
- National Natural Science Foundation of China [31770519]
- National Key R&D Program of China [2017YFC0503805]
- Duolun Restoration Ecology Research Station
Due to the profound impact of nitrogen (N) input on soil systems, linking the activity and composition of soil microbial communities to soil organic carbon (SOC) is crucial to reveal the microbial-driven mechanisms underlying SOC decomposition by nitrogen fertilization. A long-term nitrogen fertilization experiment with 6 urea fertilizer gradients (0, 2, 4, 8, 16, and 32 g N m(-2) yr(-1)) was conducted on a temperate grassland. The soil basic characteristics, microbial community DNA sequences, five soil enzymes including C, N, and phosphorus cycling, and soil C fractions were measured after 14 years of N addition. N fertilization significantly modified both the bacterial and fungal community composition, with larger variations at higher N levels. N fertilization increased the proportion of copiotrophic bacteria and saprotrophic fungi. Specific enzyme activities standardized by microbial biomass carbon among N fertilizing gradients demonstrated that the potential of labile C acquisition was stable, but the potential of N and P acquisition and recalcitrant C degradation were increased. Recalcitrant soil C fractions including alkyl C and aromatic C significantly differed among N levels, despite the stable SOC concentration. The variations of bacterial phyla and fungal trophic guilds were both associated with specific enzyme activities; meanwhile, fungal phyla were more related to soil C fractions, as the Basidiomycota abundance echoed the proportion of aromatic C at 4-16 g N m(-2) yr(-1). In conclusion, this study indicates that the changes in microbial community composition by N fertilization can have far-reaching impacts on SOC turnover and nutrient acquisition. (C) 2018 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据