DOI: 10.1111/gcb.14081
Scopus记录号: 2-s2.0-85042563260
论文题名: Interactions among plants, bacteria, and fungi reduce extracellular enzyme activities under long-term N fertilization
作者: Carrara J.E. ; Walter C.A. ; Hawkins J.S. ; Peterjohn W.T. ; Averill C. ; Brzostek E.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 6 起始页码: 2721
结束页码: 2734
语种: 英语
英文关键词: arbuscular mycorrhizal fungi
; belowground carbon allocation
; extracellular enzymes
; microbial community
; nitrogen fertilization
; plant–microbial interactions
Scopus关键词: bacterium
; belowground biomass
; colonization
; community composition
; ecosystem response
; enzyme activity
; fertilization (reproduction)
; fungus
; nitrogen cycle
; rhizosphere
; soil biota
; soil carbon
; Fernow Experimental Forest
; United States
; West Virginia
; Bacteria (microorganisms)
; Basidiomycota
; Fungi
英文摘要: Atmospheric nitrogen (N) deposition has enhanced soil carbon (C) stocks in temperate forests. Most research has posited that these soil C gains are driven primarily by shifts in fungal community composition with elevated N leading to declines in lignin degrading Basidiomycetes. Recent research, however, suggests that plants and soil microbes are dynamically intertwined, whereby plants send C subsidies to rhizosphere microbes to enhance enzyme production and the mobilization of N. Thus, under elevated N, trees may reduce belowground C allocation leading to cascading impacts on the ability of microbes to degrade soil organic matter through a shift in microbial species and/or a change in plant–microbe interactions. The objective of this study was to determine the extent to which couplings among plant, fungal, and bacterial responses to N fertilization alter the activity of enzymes that are the primary agents of soil decomposition. We measured fungal and bacterial community composition, root–microbial interactions, and extracellular enzyme activity in the rhizosphere, bulk, and organic horizon of soils sampled from a long-term (>25 years), whole-watershed, N fertilization experiment at the Fernow Experimental Forest in West Virginia, USA. We observed significant declines in plant C investment to fine root biomass (24.7%), root morphology, and arbuscular mycorrhizal (AM) colonization (55.9%). Moreover, we found that declines in extracellular enzyme activity were significantly correlated with a shift in bacterial community composition, but not fungal community composition. This bacterial community shift was also correlated with reduced AM fungal colonization indicating that declines in plant investment belowground drive the response of bacterial community structure and function to N fertilization. Collectively, we find that enzyme activity responses to N fertilization are not solely driven by fungi, but instead reflect a whole ecosystem response, whereby declines in the strength of belowground C investment to gain N cascade through the soil environment. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110386
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Biology, West Virginia University, Morgantown, WV, United States; Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN, United States; Department of Biology, Boston University, Boston, MA, United States
Recommended Citation:
Carrara J.E.,Walter C.A.,Hawkins J.S.,et al. Interactions among plants, bacteria, and fungi reduce extracellular enzyme activities under long-term N fertilization[J]. Global Change Biology,2018-01-01,24(6)