Measured and modelled source water

Churakova-Sidorova, Olga V.; Lienert, Sebastian; Timofeeva, G.; Siegwolf, R.; Roden, J.; Joos, Fortunat; Saurer, M. (2020). Measured and modelled source water. iForest - Biogeosciences and Forestry, 13(1), pp. 224-229. Italian Society of Silviculture and Forest Ecology 10.3832/ifor3212-013

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To identify source water for trees growing on permafrost in Siberia, we applied mechanistic models that quantify physical and biochemical fractionation processes, leading to oxygen isotope variation (δ18O) in plant organic matter. These models allowed us to investigate the influence of a variety of climatic factors on tree-ring cellulose from two dominant species: Larix cajanderi Mayr. from northeastern Yakutia (69° 22′ N, 148° 25′ E, ~ 250 m a.s.l.) and Pinus sylvestris L. from Central Yakutia (62°14′ N, 129°37′ E, ~ 220 m a.s.l.). The climate of the region is highly continental with short growing seasons, low amount of precipitation and these forest ecosystems are growing on permafrost, which in turn impact the water cycle and climate variation in the δ18O of source water. We compared outputs of the Land surface Processes and eXchanges (LPX-Bern v. 1.3), and Roden-Lin-Ehleringer (RLE) models for the common period from 1945 to 2004. Based on our findings, trees from northeastern and central Yakutia may have access to additional thawed permafrost water during dry summer periods. Owing to differences in the soil structure, active thaw soil depth and root systems of trees at two Siberian sites, Larix cajanderi Mayr. trees can access water not more than from 50 cm depth, in contrast to Pinus sylvestris L. in Central Yakutia which can acquire water from up to 80 cm soil depth. The results enhance our understanding of the growth and survival of the trees in this extreme environment.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Lienert, Sebastian and Joos, Fortunat

Subjects:

500 Science > 530 Physics

ISSN:

1971-7458

Publisher:

Italian Society of Silviculture and Forest Ecology

Language:

English

Submitter:

Fortunat Joos

Date Deposited:

11 Mar 2021 08:45

Last Modified:

12 Mar 2021 19:19

Publisher DOI:

10.3832/ifor3212-013

BORIS DOI:

10.48350/152990

URI:

https://boris.unibe.ch/id/eprint/152990

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