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Retrospective growthanalysis of the dwarfshrub Cassiopetetragona allowslocal estimation ofvascular plantproductivity in higharctic Svalbard Jos M. MilnerAudun StienRené van der Wal2018 год

Retrospective growth analysis of the dwarf shrub Cassiope tetragona allows local estimation of vascular plant productivity in high arctic Svalbard
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Аннотация: Abstract Question Vascular plant productivity of arctic tundra has often been viewed as varying little between years and thus being largely insensitive to the high inter‐annual variation in summer weather conditions. Yet, remote‐sensing data and retrospective growth analyses of the circumpolar dwarf shrub, Cassiope tetragona, commonly show considerable between‐year variability in plant growth in response to variation in summer temperature. Given that both Cassiope growth and vascular plant biomass production share a common environmental driver, summer temperature, we would expect positive co‐variation between them. Here we investigate whether this is indeed the case and if so over what spatial scale. Location Nordenskiöldland, high arctic Svalbard. Methods We brought dendroecology and plot‐based field estimation methodologies together in an empirical study using retrospective analysis of Cassiope growth and annual estimation of above‐ground vegetation biomass production to investigate their temporal and spatial co‐variation and sensitivity to summer weather conditions. Results Despite substantial small‐scale heterogeneity, we found spatial co‐variation in Cassiope growth patterns, which weakened as distance between sampling sites increased from 0 to 25 km. Furthermore, we found a strong positive correlation between annual estimates of above‐ground live vascular plant biomass and Cassiope shoot growth over a 12‐year period at a local scale. The correlation declined with distance, likely due to increasing differences in local weather conditions. Conclusions We demonstrate that Cassiope growth can be used as a proxy for above‐ground tundra vegetation productivity at the local scale. Our findings suggest that Arctic plant productivity is as sensitive to between‐year variation in summer temperature as the well‐established growth response of Cassiope . This challenges the view that tundra plant productivity varies little between years and provides a mechanistic understanding that helps reconcile field‐ and satellite‐based annual estimation methods.
Год издания: 2018
Авторы: Jos M. Milner, Audun Stien, René van der Wal
Издательство: Wiley
Источник: Journal of Vegetation Science
Ключевые слова: Climate change and permafrost, Cryospheric studies and observations, Tree-ring climate responses
Другие ссылки: Journal of Vegetation Science (HTML)
Aberdeen University Research Archive (Aberdeen University) (PDF)
Aberdeen University Research Archive (Aberdeen University) (HTML)