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

© 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 26(2020), 10 vom: 23. Okt., Seite 5754-5766
1. Verfasser: Lett, Signe (VerfasserIn)
Weitere Verfasser: Teuber, Laurenz M, Krab, Eveline J, Michelsen, Anders, Olofsson, Johan, Nilsson, Marie-Charlotte, Wardle, David A, Dorrepaal, Ellen
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Arctic Betula pubescens Pinus sylvestris bryophytes climate change plant interactions precipitation treeline expansion
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520 |a 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 followed Betula pubescens and Pinus sylvestris seedling 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 not Sphagnum, strongly supressed survival of both tree species. Positive effects of warming and precipitation on survival and growth of B. pubescens seedlings occurred in the absence of mosses and as expected, this was partly dependent on moss species. P. sylvestris survival was greatest at high precipitation, and this effect was more pronounced in Sphagnum than 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 
650 4 |a Journal Article 
650 4 |a Arctic 
650 4 |a Betula pubescens 
650 4 |a Pinus sylvestris 
650 4 |a bryophytes 
650 4 |a climate change 
650 4 |a plant interactions 
650 4 |a precipitation 
650 4 |a treeline expansion 
700 1 |a Teuber, Laurenz M  |e verfasserin  |4 aut 
700 1 |a Krab, Eveline J  |e verfasserin  |4 aut 
700 1 |a Michelsen, Anders  |e verfasserin  |4 aut 
700 1 |a Olofsson, Johan  |e verfasserin  |4 aut 
700 1 |a Nilsson, Marie-Charlotte  |e verfasserin  |4 aut 
700 1 |a Wardle, David A  |e verfasserin  |4 aut 
700 1 |a Dorrepaal, Ellen  |e verfasserin  |4 aut 
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773 1 8 |g volume:26  |g year:2020  |g number:10  |g day:23  |g month:10  |g pages:5754-5766 
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