Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet

Alpine treelines are projected to shift upslope in response to climate warming, but empirical studies have yielded inconsistent results, with both upshifted and stable alpine treelines. Additionally, treelines on different slope aspects of the same mountain can differ. Thus, for a better understandi...

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Autores principales:	Lili Zheng, Peili Shi, Tiancai Zhou, Ge Hou, Minghua Song, Feihai Yu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	alpine treeline ecotone climate change timberline age class Tibetan Plateau Plant ecology QK900-989
Acceso en línea:	https://doaj.org/article/108080e6367c43d3b1642ac004c208d8
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id	oai:doaj.org-article:108080e6367c43d3b1642ac004c208d8
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spelling	oai:doaj.org-article:108080e6367c43d3b1642ac004c208d82021-11-25T17:39:27ZTree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet10.3390/f121116051999-4907https://doaj.org/article/108080e6367c43d3b1642ac004c208d82021-11-01T00:00:00Zhttps://www.mdpi.com/1999-4907/12/11/1605https://doaj.org/toc/1999-4907Alpine treelines are projected to shift upslope in response to climate warming, but empirical studies have yielded inconsistent results, with both upshifted and stable alpine treelines. Additionally, treelines on different slope aspects of the same mountain can differ. Thus, for a better understanding of the mechanisms of treeline formation and treeline responses to climate change, we need to elucidate the population dynamics at treelines on different slope aspects. Here, we quantified the population dynamics of Balfour spruce (<i>Picea likiangensis</i> var. <i>rubescens</i>) at treeline ecotones on contrasting north- and east-facing slopes on the eastern Tibetan Plateau based on field surveys. The alpine treeline positions of Balfour spruce have not advanced toward higher altitudes on the contrasting slopes in recent decades. Compared with the east-facing slope, more recruits occurred on the north-facing slope above the present treeline, indicating a more favorable regeneration condition. However, on the north-facing slope, the individual growth rate of Balfour spruce was lower, and the number of adult trees above the present treeline was higher than that on the east-facing slope. Thus, slope aspects mediate a trade-off between the growth and survival of treeline species, explaining the absence of an impact of slope aspects on treeline responses to climate change. Our results highlight the importance of considering the effect of topography on population dynamics in predicting alpine treeline dynamics under the scenario of climate change.Lili ZhengPeili ShiTiancai ZhouGe HouMinghua SongFeihai YuMDPI AGarticlealpine treeline ecotoneclimate changetimberlineage classTibetan PlateauPlant ecologyQK900-989ENForests, Vol 12, Iss 1605, p 1605 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	alpine treeline ecotone climate change timberline age class Tibetan Plateau Plant ecology QK900-989
spellingShingle	alpine treeline ecotone climate change timberline age class Tibetan Plateau Plant ecology QK900-989 Lili Zheng Peili Shi Tiancai Zhou Ge Hou Minghua Song Feihai Yu Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet
description	Alpine treelines are projected to shift upslope in response to climate warming, but empirical studies have yielded inconsistent results, with both upshifted and stable alpine treelines. Additionally, treelines on different slope aspects of the same mountain can differ. Thus, for a better understanding of the mechanisms of treeline formation and treeline responses to climate change, we need to elucidate the population dynamics at treelines on different slope aspects. Here, we quantified the population dynamics of Balfour spruce (<i>Picea likiangensis</i> var. <i>rubescens</i>) at treeline ecotones on contrasting north- and east-facing slopes on the eastern Tibetan Plateau based on field surveys. The alpine treeline positions of Balfour spruce have not advanced toward higher altitudes on the contrasting slopes in recent decades. Compared with the east-facing slope, more recruits occurred on the north-facing slope above the present treeline, indicating a more favorable regeneration condition. However, on the north-facing slope, the individual growth rate of Balfour spruce was lower, and the number of adult trees above the present treeline was higher than that on the east-facing slope. Thus, slope aspects mediate a trade-off between the growth and survival of treeline species, explaining the absence of an impact of slope aspects on treeline responses to climate change. Our results highlight the importance of considering the effect of topography on population dynamics in predicting alpine treeline dynamics under the scenario of climate change.
format	article
author	Lili Zheng Peili Shi Tiancai Zhou Ge Hou Minghua Song Feihai Yu
author_facet	Lili Zheng Peili Shi Tiancai Zhou Ge Hou Minghua Song Feihai Yu
author_sort	Lili Zheng
title	Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet
title_short	Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet
title_full	Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet
title_fullStr	Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet
title_full_unstemmed	Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet
title_sort	tree regeneration patterns on contrasting slopes at treeline ecotones in eastern tibet
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/108080e6367c43d3b1642ac004c208d8
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Tree Regeneration Patterns on Contrasting Slopes at Treeline Ecotones in Eastern Tibet

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