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Mosses modify effects of warmer and wetter conditions on tree seedlings at the alpine treeline

Lett, Signe and Teuber, Laurenz M. and Krab, Eveline and Michelsen, Anders and Olofsson, Johan and Nilsson, Marie-Charlotte and Wardle, David and Dorrepaal, Ellen (2020). Mosses modify effects of warmer and wetter conditions on tree seedlings at the alpine treeline. Global Change Biology. 26 , 5754-5766
[Journal article]

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Abstract

Climate warming enables tree seedling establishment beyond the current alpine treeline, but to achieve this, seedlings have to establish within existing tundra vegetation. In tundra, mosses are a prominent feature, known to regulate soil temperature and moisture through their physical structure and associated water retention capacity. Moss presence and species identity might therefore modify the impact of increases in temperature and precipitation on tree seedling establishment at the arctic-alpine treeline. We followedBetula pubescensandPinus sylvestrisseedling survival and growth during three growing seasons in the field. Tree seedlings were transplanted along a natural precipitation gradient at the subarctic-alpine treeline in northern Sweden, into plots dominated by each of three common moss species and exposed to combinations of moss removal and experimental warming by open-top chambers (OTCs). Independent of climate, the presence of feather moss, but notSphagnum, strongly supressed survival of both tree species. Positive effects of warming and precipitation on survival and growth ofB. pubescensseedlings occurred in the absence of mosses and as expected, this was partly dependent on moss species.P. sylvestrissurvival was greatest at high precipitation, and this effect was more pronounced inSphagnumthan in feather moss plots irrespective of whether the mosses had been removed or not. Moss presence did not reduce the effects of OTCs on soil temperature. Mosses therefore modified seedling response to climate through other mechanisms, such as altered competition or nutrient availability. We conclude that both moss presence and species identity pose a strong control on seedling establishment at the alpine treeline, and that in some cases mosses weaken climate-change effects on seedling establishment. Changes in moss abundance and species composition therefore have the potential to hamper treeline expansion induced by climate warming.

Authors/Creators:Lett, Signe and Teuber, Laurenz M. and Krab, Eveline and Michelsen, Anders and Olofsson, Johan and Nilsson, Marie-Charlotte and Wardle, David and Dorrepaal, Ellen
Title:Mosses modify effects of warmer and wetter conditions on tree seedlings at the alpine treeline
Year of publishing :2020
Volume:26
Page range:5754-5766
Number of Pages:13
ISSN:1354-1013
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Arctic, Betulapubescens, bryophytes, climate change, Pinussylvestris, plant interactions, precipitation, treeline expansion
URN:NBN:urn:nbn:se:slu:epsilon-p-107111
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107111
Additional ID:
Type of IDID
DOI10.1111/gcb.15256
Web of Science (WoS)000552351300001
ID Code:17626
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment

(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:29 Sep 2020 13:45
Metadata Last Modified:29 Sep 2020 13:51

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