DOI: 10.1111/gcb.13957
Scopus记录号: 2-s2.0-85041283011
论文题名: Quantitative losses vs. qualitative stability of ectomycorrhizal community responses to 3 years of experimental summer drought in a beech–spruce forest
作者: Nickel U.T. ; Weikl F. ; Kerner R. ; Schäfer C. ; Kallenbach C. ; Munch J.C. ; Pritsch K.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 2 起始页码: e560
结束页码: e576
语种: 英语
英文关键词: climate change
; ectomycorrhizae
; enzyme activities
; Fagus sylvatica
; forest ecosystems
; fungal diversity
; Picea abies
; summer drought
Scopus关键词: climate change
; community response
; coniferous tree
; drought
; enzyme activity
; experimental study
; forest ecosystem
; growth
; mycorrhiza
; qualitative analysis
; quantitative analysis
; species diversity
; summer
; Central Europe
; Fagus
; Fagus sylvatica
; Picea
; Picea abies
英文摘要: Forest ecosystems in central Europe are predicted to face an increasing frequency and severity of summer droughts because of global climate change. European beech and Norway spruce often coexist in these forests with mostly positive effects on their growth. However, their different below-ground responses to drought may lead to differences in ectomycorrhizal (ECM) fungal community composition and functions which we examined at the individual root and ecosystem levels. We installed retractable roofs over plots in Kranzberg Forest (11°39′42″E, 48°25′12″N; 490 m a.s.l.) to impose repeated summer drought conditions and assigned zones within each plot where trees neighboured the same or different species to study mixed species effects. We found that ECM fungal community composition changed and the numbers of vital mycorrhizae decreased for both tree species over 3 drought years (2014–2016), with the ECM fungal community diversity of beech exhibiting a faster and of spruce a stronger decline. Mixed stands had a positive effect on the ECM fungal community diversity of both tree species after the third drought year. Ectomycorrhizae with long rhizomorphs increased in both species under drought, indicating long-distance water transport. However, there was a progressive decline in the number of vital fine roots during the experiment, resulting in a strong reduction in enzyme activity per unit volume of soil. Hydrolytic enzyme activities of the surviving ectomycorrhizae were stable or stimulated upon drought, but there was a large decline in ECM fungal species with laccase activity, indicating a decreased potential to exploit nutrients bound to phenolic compounds. Thus, the ectomycorrhizae responded to repeated drought by maintaining or increasing their functionality at the individual root level, but were unable to compensate for quantitative losses at the ecosystem level. These findings demonstrate a strong below-ground impact of recurrent drought events in forests. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110512
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Allergens in Ecosystems, Neuherberg, Germany; Forest Growth and Yield Science, Technische Universität München, Freising, Germany; Ecophysiology of Plants, Technische Universität München, Freising, Germany; Grassland Science, Technische Universität München, Freising, Germany
Recommended Citation:
Nickel U.T.,Weikl F.,Kerner R.,et al. Quantitative losses vs. qualitative stability of ectomycorrhizal community responses to 3 years of experimental summer drought in a beech–spruce forest[J]. Global Change Biology,2018-01-01,24(2)