Stem growth and stem sap flow measurements of three conifer tree species in Siberia

Alexey Rubtsov,Alexander Shashkin,Anastasia Knorre,Eugene Vaganov,Alberto Arzac,Vera Benkova

doi:10.1088/1755-1315/611/1/012028

Alexey Rubtsov, Alexander Shashkin + Show 4 more

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https://doi.org/10.1088/1755-1315/611/1/012028

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Abstract

This work is targeted to evaluate the reaction of individual trees against periodic and punctual environmental stressing events with a network of long-term monitoring of tree water/growth-related processes in various geographic and climatic areas. Instrumental measurements of stem circumferential/radial size changes (dRc/dR) using band/point dendrometers and stem sap flow rates (Q) using a trunk segment heat balance method in Scots pine, Siberian larch, and Dahurian larch trees have been carried out at three research sites in Krasnoyarsk Krai, Russia. Analysis of perennial dRc/dR and seasonal Q data obtained in 2015-2019 allows us to characterize the seasonality and features of the tree stem growth and stem water transport rates specific for each of the studied conifer species and on different temporal scales (diurnal, inter/intra-seasonal, and annual). The archived in-situ data are used to verify the efficiency of some process-based BS-and stochastic VS-tree growth and phenology models for Siberian larch and Scots pine trees. The results have confirmed the realistic nature of the simulation and have shown certain drawbacks of these models.

Highlights

Current climate change alters the sustainability of forest ecosystems worldwide [1]
Versatile estimation of the links between tree water regime and tree stem radial growth depending on variations of local weather and soil hydrothermal conditions in Central Siberia on different time scales is the main idea of this work
Research sites This study was based on miscellaneous local in-situ data including dendrometer and sap flow measurements in conifer trees at three research sites in Central Siberia within the territory of Krasnoyarsk Krai in Russia: the “NARIM” research station in the national park “Krasnoyarsk Stolby”, the “Pogorelsky bor” (PogBor) research station and the Zotino Tall Tower Observatory (ZOTTO) international research station

Summary

Introduction

Current climate change alters the sustainability of forest ecosystems worldwide [1]. Boreal forests in Siberia are vulnerable due to the increased impact of regional anomalies of seasonal weather conditions within the last decades [2]. Versatile estimation of the links between tree water regime and tree stem radial growth depending on variations of local weather and soil hydrothermal conditions in Central Siberia on different time scales (diurnal, inter- and intraseasonal, annual) is the main idea of this work.

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