Arne Sellin

Arne Sellin
University of Tartu · Institute of Ecology and Earth Sciences

PhD

About

90
Publications
13,057
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2,248
Citations
Citations since 2017
24 Research Items
897 Citations
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2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Introduction
Arne Sellin currently works at the Institute of Ecology and Earth Sciences, University of Tartu. Arne does research in ecology, ecophysiology and climate change impacts on forest ecosystems. Our current project is 'Acclimatory Responses of Boreal Trees to Regional Climate Trends: Consequences for Tree Growth and Forest Ecosystem Functioning'.

Publications

Publications (90)
Article
Full-text available
Global climate change creates new environmental scenarios and selective pressures; thus, a better understanding of the plasticity of plant functional traits is needed to predict how plant species will respond to shifts in climate. Among the important functional traits for plants are their hydraulic properties which ultimately determine their photos...
Article
Full-text available
Key message: No evidence of coordination between leaf hydraulic function and stomatal characteristics was observed in young hybrid aspen stands attributable to the near-anisohydric behaviour and the fast-growing nature of this species. Abstract: Within forest canopies, there are environmental gradients that enhance water losses in the direction o...
Article
Environmental conditions and photoperiod length drive the seasonal variability of gas exchange in plants. Still, little is known about trees’ adaptation to climate change, expressed as a delay in decreasing photosynthetic capacity at the end of the growing season. We investigated the effect of elevated air humidity (RH) and sampling period (from Ju...
Article
Environmental conditions and photoperiod length drive the seasonal variability of gas exchange in plants. Still, little is known about trees’ adaptation to climate change, expressed as a delay in decreasing photosynthetic capacity at the end of the growing season. We investigated the effect of elevated air humidity (RH) and sampling period (from Ju...
Article
Full-text available
Aquaporin water channels (AQPs) constitute a large family of transmembrane proteins present throughout all kingdoms of life. They play key roles in the flux of water and many solutes across the membranes. The AQP diversity, protein features, and biological functions of silver birch are still unknown. A genome analysis of Betula pendula identified 3...
Article
Full-text available
It is widely acknowledged that many plant species can keep stomata open during night. We examined how nocturnal stomatal conductance differs among potted saplings of nine temperate tree species from diverse native habitats in wet and dry soil conditions, and how it affects plant predawn water status. Nocturnal stomatal conductance in dry soil condi...
Conference Paper
A growing body of evidence suggests that water uptake of plants depends on available N forms. The objective of this study was to investigate tree water flux at different levels of relative humidity (RH) of air, soil N source (ammonium, nitrate), and N contents. Aspen saplings demonstrated lower (p<0.05) night-time and daytime sap flux densities (F)...
Article
High relative air humidity (RH ≥ 85%) is frequent in controlled environments, and not uncommon in nature. In this review, we examine the high RH effects on plants with a special focus on stomatal characters. All aspects of stomatal physiology are attenuated by elevated RH during leaf expansion (long-term) in C3 species. These include impaired openi...
Article
Full-text available
Key message Predawn water potential disequilibrium in hybrid aspen coppice growing in humid environment was mostly determined by hydraulic conductance and the ratio of nocturnal to daily water loss was relatively small. Abstract Water relations are of crucial importance for biomass accumulation in trees and forest productivity, yet the significanc...
Article
Aspens are fast-growing clonal trees with a wide circumboreal distribution range, suitable for the production of pulp and bioenergy. The adaptability of aspen short-rotation coppice systems to climate change has rarely been investigated. For a large part of aspens’ northern range, climate models predict an increase in precipitation and, consequentl...
Article
Forest understory species have to acclimatize to highly heterogeneous light conditions inside forest canopies in order to utilize available resources efficiently. Light sensitivity and response speed of hydraulic conductance (KL) of common hazel (Corylus avellana L.) to fast changes in irradiance was studied in leaves from three different growth li...
Article
Full-text available
Key message The xylem anatomical structure of Betula pendula is conservative regarding changes in atmospheric humidity, but it is plastic along the vertical canopy profile to optimise water supply among different foliage layers. We studied responses of wood anatomical traits in silver birch (Betula pendula) to artificially elevated air humidity to...
Article
Climate change scenarios predict an increase in air temperature and precipitation in northern temperate regions of Europe by the end of the century. Increasing atmospheric humidity inevitably resulting from more frequent rainfall events reduces water flux through vegetation, influencing plants’ structure and functioning. We investigated the extent...
Chapter
Full-text available
Several climate change scenarios predict increasing precipitation for northern latitudes and several other regions in the globe, leading to increase in atmospheric water vapour content [expressed as increased relative humidity (RH) or as decreased water vapour pressure deficit (VPD)] and environmental wetness. Plants are known to be sensitive to hi...
Article
Full-text available
Increasing atmospheric humidity—a climate trend predicted for northern Europe—will reduce water flux through vegetation. Diminished transpirational water flux impacts various physiological processes, causing growth decline in deciduous trees. We propose, based on the results obtained from the long-term free air humidity manipulation experiment, con...
Article
Full-text available
At northern latitudes, a rise in atmospheric humidity and precipitation is predicted as a consequence of global climate change. We investigated the impact of high (H) and moderate (M) daytime air relative humidity (RH) on water relation parameters and foliar nutrient status in saplings of silver birch, to elucidate the interactions between water an...
Article
Full-text available
The study was performed on coppice shoots and 9-yr-old saplings of hybrid aspen (Populus tremula L. x P. tremuloides Michx.) growing at the Free Air Humidity Manipulation site in 2013 and 2014. The main aims of our study were to determine the differences in water potentials between soil and leaves before dawn, and the major environmental factors pr...
Article
Climate models predict greater increases in the frequency than in the amount of precipitation and a consequent rise in atmospheric humidity at high latitudes by the end of the century. We investigated the responses of hydraulic and relevant anatomical traits of xylem to elevated relative humidity of air on a 1-yr-old coppice of hybrid aspen (Populu...
Article
Leaves have to acclimatize to heterogeneous radiation fields inside forest canopies in order to efficiently exploit diverse light conditions. Short-term effects of light quality on photosynthetic gas exchange, leaf water use and hydraulic traits were studied on Betula pendula Roth shoots cut from upper and lower thirds of the canopy of 39- to 35-year-o...
Article
Physiological processes taking place in plants are subject to diverse circadian patterns but some of them are poorly documented in natural conditions. The daily dynamics of physico-chemical properties of xylem sap and their covariation with tree hydraulic traits were investigated in hybrid aspen (Populus tremula L. × P. tremuloides Michx) in field...
Conference Paper
Full-text available
The hydraulic transport capacity and stomatal openness are closely linked in vascular plants. Moreover, the structure and function of the water transport system govern the productivity and survival of land plants, because the vascular architecture places physical limits on plant functioning (according to the hydraulic limitation hypothesis). We per...
Article
The interactive effects of climate variables and tree-tree competition are still insufficiently understood drivers of forest response to global climate change. Precipitation and air humidity are predicted to rise concurrently at high latitudes of the Northern Hemisphere. We investigated if the growth response of deciduous trees to elevated air humi...
Article
Full-text available
As changes in air temperature, precipitation, and air humidity are expected in the coming decades, studies on the impact of these environmental shifts on plant growth and functioning are of major importance. Greatly understudied aspects of climate change include consequences of increasing air humidity on forest ecosystems, predicted for high latitu...
Article
The study investigated the effects of exposure to increased relative air humidity (RH) on stomatal morphology and sensitivity to stomata closure inducing stimulus (low RH) in hybrid aspen (Populus tremula L. × P. tremuloides Michx.) coppice growing in field conditions. Artificially elevated RH reduced air vapour pressure deficit by 5%–10% and alter...
Article
Full-text available
This study was performed on hybrid aspen saplings growing at the Free Air Humidity Manipulation site in Estonia. We investigated changes in wood anatomy and hydraulic conductivity in response to increased air humidity. Two hydraulic traits (specific conductivity and leaf-specific conductivity) and four anatomical traits of stem wood – relative vess...
Conference Paper
Full-text available
Climate change scenarios predict by the end of the century increases in air temperature by 3.5–5ºC and precipitation by 5–30% in boreal and northern temperate regions of Europe. Increase in atmospheric relative humidity (RH), the inevitable result of more frequent rainfall events, will reduce water fluxes through the forest canopies. This has impac...
Article
Full-text available
We studied the physicochemical properties of stemwood in saplings of silver birch (Betula pendula Roth) and hybrid aspen (Populus tremula L. × P. tremuloides Michx.), grown for four years under artificially elevated relative air humidity (on average by 7%) in field conditions, using the Free Air Humidity Manipulation (FAHM) research facility in Est...
Article
Full-text available
An increase in average air temperature and frequency of rain events is predicted for higher latitudes by the end of the 21st century, accompanied by a probable rise in air humidity. We currently lack knowledge on how forest trees acclimate to rising air humidity in temperate climate. We analysed leaf gas exchange, sap flow and growth characteristic...
Article
Light- and nitrogen-use change was examined along productivity gradients in natural grasslands at Laelatu, western Estonia, both at community level and in most abundant species. Aboveground biomass (M) ranged from 341 to 503 g m−2 in wet (W) and from 248 to 682 g m−2 in dry (D) community. Aboveground leaf area ratio (aLAR) decreased with rising M i...
Article
Full-text available
Effects of water deficit on plant water status, gas exchange and hydraulic conductance were investigated in Betula pendula under artificially manipulated air humidity in Eastern Estonia. The study was aimed to broaden an understanding of the ability of trees to acclimate with the increasing atmospheric humidity predicted for northern Europe. Rapidl...
Article
Although the impact of nitrogen availability on the night-time water relations of plants has received a lotof attention during the last decade, knowledge of how these two traits are interrelated is contradictoryand still limited. The aim of the current study was to investigate the impact of leaf nitrogen concentrationon night-time (Enap) and daytim...
Article
Full-text available
We investigated phloem-xylem interactions in relation to leaf hydraulic capacity in hybrid aspen (Populus tremula L. × P. tremuloides Michx.) by using phloem girdling method. Removal of bark tissues (phloem girdling) at the branch base resulted in a substantial decline in stomatal conductance (gS), net photosynthetic rate (PN), and leaf hydraulic e...
Conference Paper
Full-text available
Increasing atmospheric humidity predicted for northern Europe reduce water fluxes through vegetation, and have an effect on the structure of leaves and vascular tissues, plant hydraulic properties, biomass allocation, nutrient uptake and growth (Tullus et al. 2012). We investigated impact of elevated air humidity on anatomical structure of leaf vas...
Article
a b s t r a c t Daily dynamics of leaf (K L) and soil-to-branch hydraulic conductance (K SeB) was investigated in silver birch (Betula pendula Roth.) using evaporative flux method in situ: water potential drop was measured with a pressure chamber and evaporative flux was estimated as sap flux density measured with sap flow gauges. Canopy position h...
Article
Full-text available
A study was performed on saplings of silver birch (Betula pendula Roth) growing at the free air humidity manipulation site, which was established to investigate the effect of increased air humidity on tree performance and canopy functioning. The aim of the experiment was to simulate the impact of the increasing atmospheric humidity on forest ecosys...
Conference Paper
Climate change scenarios predict increase in air temperature by 3.5-5° C and precipitation by 5-30% in boreal and northern temperate regions of Europe by the end of the century. On the other hand, climate extremes including heat waves and droughts are projected to become more frequent and last longer across Europe over the 21st century. Increasing...
Conference Paper
At northern latitudes a rise in atmospheric humidity and precipitation is predicted as a consequence of global climate change. In 2006 an unique experimental facility for free air humidity manipulation (FAHM) was established in Estonia to study the functioning of deciduous forest ecosystem under altered humidity conditions. The experimental site co...
Article
Previous investigations have been demonstrated that night-time water flux may increase or remain unchanged at low mineral nutrient availability. At the same time, it is a well-known fact that nighttime water flux is relatively high in fast-growing species, which typically grow in fertile soil. To test the impact of soil nutrient deficiency on night...
Article
Full-text available
At northern latitudes a rise in atmospheric humidity and precipitation is predicted as a consequence of global climate change. We studied several growth and functional traits of hybrid aspen (Populus tremula L.×P. tremuloides Michx.) in response to elevated atmospheric humidity (on average 7% over the ambient level) in a free air experimental facil...
Data
Growth characteristics (arithmetic mean ± standard error) of hybrid aspens in control (C1, C2, C4) and humidified (H1, H2, H4) plots during the study period. (DOC)
Data
First and second order results of the model. (DOC)
Article
Full-text available
Variation in leaf and shoot hydraulic conductance was examined on detached shoots of silver birch (Betula pendula Roth), cut from the lower third (shade leaves) and upper third of the crown (sun leaves) of large trees growing in a natural temperate forest stand. Hydraulic conductances of whole shoots (K (S)), leaf blades (K (lb)), petioles (K (P))...
Article
A facility for free air humidity manipulation (FAHM) was established to investigate the effect of increased air humidity on trees’ performance and their canopy functioning with respect to rising air humidity predicted for Northern Europe. The FAHM system enables air relative humidity (RH) to be increased up to 18 units (%) over the ambient level du...
Article
Responses of leaf and shoot hydraulic conductance to light quality were examined on shoots of silver birch (Betula pendula), cut from lower ('shade position') and upper thirds of the crowns ('sun position') of trees growing in a natural temperate forest stand. Hydraulic conductances of leaf blades (K(lb) ), petioles (K(P) ) and branches (i.e. leafl...
Article
Sap flux density (FLA) in branches of Betula pendula trees was examined with respect to environmental variables and canopy position. FLA of branches sampled within the basal and top thirds of crowns was analysed with respect to stomatal (gs), canopy (gc) and soil-to-leaf hydraulic conductance (KT). The canopy positions differed significantly (P < 0...
Article
Full-text available
It is a well-described phenomenon that plant leaves respond to changes in light intensity and duration by adjusting leaf hydraulic efficiency, and there is current consensus that up- or down-regulation of water channels (aquaporins) in the plasma membrane of the bundle sheath and mesophyll cells play a central role in the underlying mechanisms. Rec...
Article
Spatial and daily variation in photosynthetic water-use efficiency was examined in leaves of Betula pendula Roth with respect to distribution of hydraulic conductance within the crown, morphological properties of stomata, and water availability. Intrinsic water-use efficiency (A n/g s) was determined from gas-exchange measurements performed both in...
Article
Night-time/daytime water relations were studied in crown of a small-leaf linden tree. Branch sap flow (Fb) varied strongly with crown positions, whereas the upper branch showed about 2.5 times higher values of Fb compared to the lower-crown branch. Differences in Fb between canopy positions were observed also at night. The analyses of covariance re...
Article
Needle nitrogen partitioning and photosynthesis of Norway spruce were studied in a forest chronosequence in Järvselja Experimental Forest, Estonia. Current- and previous-year shoots were sampled from upper and lower canopy positions in four stands, ranging in age from 13 to 82years. A/c i curves were determined to obtain maximum carboxylation rate...
Article
Variation in leaf hydraulic conductance (K(L)) and distribution of resistance in response to light intensity and duration were examined in shoots of silver birch (Betula pendula Roth). K(L) was determined on detached shoots using the evaporative flux method (transpiration was measured with a porometer and water potential drop with a pressure chambe...
Article
Spatial patterns in vessel diameter, vessel density and xylem conducting efficiency within a crown were examined in closed-canopy trees of silver birch (Betula pendula). The variation in anatomical and hydraulic characteristics of branches was considered from three perspectives: vertically within a crown (lower, middle and upper crown), radially al...
Article
Stomatal density and size were measured along the light gradient of a Betula pendula Roth. canopy in relation to microclimatic conditions. The theoretical stomatal conductance was calculated using stomatal density and dimensions to predict to what degree stomatal conductance is related to anatomical properties and relative stomatal opening. Stomata...
Article
More than 5,000 measurements from 1,943 plant species were used to explore the scaling relationships among the foliar surface area and the dry, water, and nitrogen/phosphorus mass of mature individual leaves. Although they differed statistically, the exponents for the relationships among these variables were numerically similar among six species gr...
Article
Full-text available
Response of whole-leaf hydraulic conductance (G(L)) in little-leaf linden (Tilia cordata Mill.) to temperature and photosynthetic photon flux (Q(P)) was estimated by the evaporative flux method under natural conditions in a mixed forest canopy. Mean midday G(L) in the lower- and upper-crown foliage was 1.14 and 3.06 mmol m(-2) s(-1) MPa(-1), respec...
Article
Responses of leaf conductance (g L) to variation in environmental and plant hydraulic factors were examined on intact and detached shoots of little-leaf linden (Tilia cordata Mill.) with respect to branch position in the crown. Using detached shoots, we manipulated leaf water supply and light availability in order to separate the effects of insuffi...
Article
Water relations were studied in Norway spruce [Picea abies (L.) Karst.] trees grown at ambient (AC, 350 μmol mol−1) and elevated (EC, 700 μmol mol−1) CO2 concentrations under temperate water stress. The results suggested that both crown position and variability in atmospheric CO2 concentration are responsible for different patterns of crown water r...
Article
Water relations and gas exchange were studied in the crowns of small European larch (Larix decidua Mill.) trees with respect to branch position. The upper-crown branches showed significantly higher branch sap flux rate (F la) and branch conductance (g b) compared to the lower crown (P<0.001). Values of leaf conductance (g l), transpiration rate (E)...
Article
Spatial variation in sapwood area to leaf area ratio (Huber value, HV) and specific leaf area (SLA) was examined in branches of closed-canopy trees of silver birch (Betula pendula Roth). HV increased basipetally within a crown and decreased with increasing branch order, but exhibited no significant radial trend along a primary branch. HV was primar...
Article
Responses of leaf conductance (gL) to variation in photosynthetic photon flux density (QP), leaf-to-air vapour pressure difference (VPD), bulk leaf water potential (Ψx) and soil to leaf hydraulic conductance (GT) were studied in silver birch (Betula pendula Roth) foliage with respect to leaf position within the canopy. The upper canopy leaves demon...
Article
Responses of leaf conductance (gL) to variation in photosynthetic photon flux density (QP), leaf-to-air vapour pressure difference (VPD), bulk leaf water potential (Psi(x)), and total hydraulic conductance (GT) were examined in silver birch (Betula pendula Roth) with respect to leaf position in the crown. To reduce limitations caused by insufficien...
Article
Full-text available
Responses of leaf conductance (g(L)) to variation in photosynthetic photon flux density, leaf-to-air vapour pressure difference, shoot water potential and soil-to-leaf hydraulic conductance (G(T)) were studied in Picea abies (L.) Karst. foliage with respect to shoot age and position within the canopy. The upper canopy shoots demonstrated on average...
Article
We compared four types of 30-year-old forest stands growing on spoil of opencast oil shale mines in Estonia. The stand types were: (1) natural stands formed by spontaneous succession, and plantations of (2) Pinus sylvestris (Scots pine), (3) Betula pendula (silver birch), and (4) Alnus glutinosa (European black alder). In all stands we measured pro...
Article
Nutrient conservation in plants and soil fertility may be intricately linked. We studied nitrogen conservation in small Scots pine (Pinus sylvestrisL.) trees growing in stands on organogenic Dystric Histosols and on mineral Podzols. Nitrogen-resorption efficiency (NRE) and proficiency (NRP) of senescent needles, and mean residence time of nitrogen...
Article
The aim of the study was to examine whether the variation in needle longevity of Scots pine (Pinus sylvestris L.) is of a community-specific nature. Altogether 300 trees were examined in Vaccinium, dry heath, and pine bog forests in Estonia. Mean number of needle age-classes was 4.1 for all forest types, while mean survivorship of needles averaged...
Article
A study of how the water conducting systems of 30–50-year-old Norway spruce (Picea abies (L.) Karst.) trees growing at three sites adjust to shade and waterlogging indicated that water relations characteristics varied with the life histories of the trees. Xylem was more efficient at conducting water and stomata were more sensitive to atmospheric ev...
Article
Pensa, M.1, 2, Jalkanen, R.3 and Sellin, A.2 (1Institute of Ecology, Department of Northeast Estonia, Pargi 15, 41537 Jõhvi, Estonia, 2University of Tartu, Department of Botany and Ecology, Lai 40, 51005 Tartu, Estonia, and 3The Finnish Forest Research Institute, Rovaniemi Research Station, P.O. Box 16, FI-96301 Rovaniemi, Finland). Age -dependen...
Article
Morphological and stomatal responses of Norway spruce (Picea abies) foliage to light availability were studied in respect to shoot age. Needle minor diameter (D1, anatomical width), major diameter (D2, anatomical thickness), dry weight (M), and tissue density index (ID) increased, and needle flatness (Fl) and specific leaf area (SLA) decreased with...
Article
Different calculation methods, based on needle geometry, for estimating both projected area (PLA) and total surface area (TLA) of foliage in Norway spruce [Picea abies (L.) Karst.] were compared. Seventy-eight shoots of four age classes were sampled from both the basal and top thirds of crowns. Three dimensions (the length, minor and major diameter...
Article
The long-term impact of air pollutants emitted by oil shale industry on growth and needle retention in Scots pine (Pinus sylvestris L) was examined at Kose, in the middle of the North-East Estonian industrial region. Control trees were chosen in a stand growing at Lehtmetsa, North Estonia, 130 km from Kose. Ar both sites, ten pine trees were felled...
Article
Variation in base water potential (Psi(b), a daily maximum level of plant water potential, which is presumed to correspond to the equilibrium between soil and plant water potentials) was examined in shoots of Picea abies and Vaccinium myrtillus with respect to soil (available water storage, water potential, temperature) and atmospheric (temperature...
Article
Full-text available
Where there is sufficient water storage in the soil the water potential (Ψx) in shoots of Norway spruce [Picea abies (L.) Karst.] is strongly governed by the vapour pressure deficit of the atmosphere, while the mean minimum values of Ψx usually do not drop below –1.5 MPa under meteorological conditions in Estonia. If the base water potential (Ψb) i...
Article
Daily dynamics of the shoot water potential (ψ) in Norway spruce [Picea abies (L.) Karst.] depending on soil water availability and atmospheric evaporative demand was studied on originally freely-grown trees and suppressed trees exposed to full sunlight after clear-cutting. The base water potential (ψb) was significantly correlated (R2 = 0.73) with...
Article
Variation in base water potential (Ψb, a daily maximum level of plant water potential, which is presumed to correspond to the condition of equilibrium between the soil and plant water potentials) was examined in shoots of Norway spruce trees growing in well-drained and waterlogged soils. The influence of soil water content, air temperature, and vap...
Article
Relationships between tree age, radial growth rate and sapwood amount were studied in 125 Norway spruce [Picea abies (L.) Karst.] trees belonging to dominant and suppressed crown classes. The sapwood radial width and transverse area depend logistically on tree age. while the rate of sapwood increase and the asymptote value are determined by radial...
Thesis
Thesis (Ph. D.)--Tartu University, 1994. Summary also in Estonian. Includes bibliographical references.
Article
The relationships of sapwood radial width and transverse area to tree diameter, age, and growth rate were investigated in Picea abies (L.) Karst. A total of 125 trees growing with (suppressed trees) and without (dominant trees) competition for light were sampled. Both sapwood and heartwood amounts showed an increase with diameter at the stem base,...
Article
The relative hydraulic conductivity (k) of xylem and resistance (R) to water flow through trunk, primary roots and branches in Picea abies trees growing under contrasting light conditions were investigated. The xylem permeability to water was measured by forcing 10 mM water solution of KC1 through excised wood specimens. From the values of k, the s...
Article
The influence of xylem water content on the hydraulic conductivity of sapwood was measured on branch sections of Picea abies. Relative conductivity of the branchwood ranged from 0.03 x 10-12 to 1.62 x 10-12 m2 depending on water saturation level. A reduction in relative water content from 100 to 75% caused permeability to fall curvilinearly by abou...
Article
Variation of sapwood thickness in terms of a linear measurement and a growth ring count with reference to the age was studied in dominant and suppressed Norway spruce trees. In the trees of both dominance classes the sapwood thickness increased in absolute terms, while its relative portion decreased with the age of the trees growing. Great differen...