气候变化领域集成服务门户(CCPortal): The impact of different natural environments on the regeneration dynamics of two Nothofagus species across elevation in the southern Andes

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DOI	10.1016/j.foreco.2020.118034
	The impact of different natural environments on the regeneration dynamics of two Nothofagus species across elevation in the southern Andes
	Cagnacci J.; Estravis-Barcala M.; Lia M.V.; Martínez-Meier A.; Gonzalez Polo M.; Arana M.V.
发表日期	2020
ISSN	0378-1127
卷号	464
英文摘要	A widely accepted paradigm in forest ecology proposes that patterns of relative abundance among mature forest trees are largely influenced by biotic and abiotic processes that operate most intensely during the earliest life-cycle stages. Therefore, traits expressed early in development such as germination and seedling establishment may be under strong selective pressure from the environment, and their adjustment to changing climates may ultimately influence species’ responses to global climate change. Here we used different environments established across altitude in an old-growth temperate Patagonian forest as a natural laboratory, and studied the Nothofagus obliqua and N. pumilio regeneration response – seedling emergence and survival –to different climatic scenarios, inside and outside their natural distribution range. These are two iconic species of sub-Antarctic forests, which co-exist in contrasting and non-overlapping thermal niches. Whereas N. obliqua is predominant in the warmer and lower environments at 650–850 m above sea level (a.s.l.), N. pumilio inhabits the colder and higher montane environments, above 1000 m a.s.l. By sowing germinated seeds of both species at different altitudes in the forest – 680, 930 and 1340 m a.s.l. – we were able to distinguish the environmental influence on seedling emergence from its influence on germination. Our results show that the local environment had a major effect on seedling survival, and a minor influence on emergence. Overall, regeneration of both species showed a temporal window of stronger environmental susceptibility, which comprised the process of emergence, and in the particular case of N. obliqua, the first month of post-emergence growth. Survival ability was influenced by the ontogenetic stage of the seedling, evidencing stronger environmental resistance and higher probability of survival after the first year of growth. Interestingly, we found inter-specific differences in survival dynamics and the final number of surviving seedlings, which may reflect species-specific physiological adaptations and tolerance to abiotic stress. However, the performance of both species was favored in relatively colder environments inside their natural ranges. This indicates that present climatic conditions in the lower zones of the gradient exert physiological constraints at seedling stage, even in N. obliqua, which shows high abundance of adult trees at these altitudes. Results reported here were consistent across two independent experiments and will be discussed in the context of forest regeneration in present and future climatic scenarios. © 2020 Elsevier B.V.
英文关键词	Altitudinal gradient; Climate change; Nothofagus; Regeneration; Relative air humidity; Temperature
语种	英语
scopus关键词	Climate change; Cultivation; Physiology; Plants (botany); Reforestation; Sea level; Seed; Temperature; Environmental influences; Environmental resistance; Nothofagus; Physiological adaptations; Probability of survival; Regeneration; Relative air humidities; Seedling establishment; Ecology; abiotic factor; altitude; elevation; global climate; probability; regeneration; relative abundance; sea level; seedling emergence; seedling establishment; sowing; survival; Cultivation; Nothofagus; Physiology; Reforestation; Temperature; Andes; Nothofagus; Nothofagus obliqua; Nothofagus pumilio
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155343
作者单位	Instituto de Investigaciones Forestales y Agronómicas Bariloche (IFAB), (Instituto Nacional de Tecnología Agropecuaria - Consejo Nacional de Investigaciones Científicas y Técnicas), Modesta Victoria 4450, San Carlos de Bariloche, Rio Negro R8402DVZ, Argentina; Instituto Andino Patagónico de Tecnologías Biológicas y Geoambientales (IPATEC), (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional del Comahue), Av. de los Pioneros 2350, San Carlos de Bariloche, Argentina; Instituto de Agrobiotecnología y Biología Molecular (IABIMO), (Instituto Nacional de Tecnología Agropecuaria - Consejo Nacional de Investigaciones Científicas y Técnicas), Nicolás Repetto y de Los Reseros s/n, Hurlingham, Buenos Aires, B1686K6, Argentina; Instituto de Investigaciones en Biodiversidad y Medioambiente, (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional del Comahue), Quintral 1250, San Carlos de Bariloche, Río Negro R8400FRF, Argentina
推荐引用方式 GB/T 7714	Cagnacci J.,Estravis-Barcala M.,Lia M.V.,et al. The impact of different natural environments on the regeneration dynamics of two Nothofagus species across elevation in the southern Andes[J],2020,464.
APA	Cagnacci J.,Estravis-Barcala M.,Lia M.V.,Martínez-Meier A.,Gonzalez Polo M.,&Arana M.V..(2020).The impact of different natural environments on the regeneration dynamics of two Nothofagus species across elevation in the southern Andes.Forest Ecology and Management,464.
MLA	Cagnacci J.,et al."The impact of different natural environments on the regeneration dynamics of two Nothofagus species across elevation in the southern Andes".Forest Ecology and Management 464(2020).