Search results for: Victor J. Lieffers

Items from 1 to 20 out of 47 results

article

Rapid understory plant recovery following forest floor protection on temporary drilling pads

Caren E. Jones, Sascha Bachmann, Victor J. Lieffers, Simon M. Landhäusser

Oil sands exploration fragments the boreal landscape by constructing numerous drilling pads to assess underground petroleum reserves. Reclamation of these pads is challenging and slow, particularly for forest understory species. We investigated the feasibility of accelerated forest understory restoration on these temporary pads by taking advantage of the propagule bank and clonal regeneration strategy...

article

Re-establishment of hummock topography promotes tree regeneration on highly disturbed moderate-rich fens

Victor J. Lieffers, Richard T. Caners, Hangfei Ge

Journal of Environmental Management > 2017 > 197 > C > 258-264

Winter exploration of oil sands deposits underlying wooded fens mostly eliminates the hummock-hollow topography on drilling pads and the ice roads leading to them, after their abandonment in spring. Recovery of black spruce (Picea mariana (P. Mill.) B.S.P.) and tamarack (Larix laricina (Du Roi) K. Koch) on these disturbed peatlands is thought to depend on the recovery of hummock topography. In late...

article

Daytime and nighttime wind differentially affects hydraulic properties and thigmomorphogenic response of poplar saplings

Ping Huang, Xianchong Wan, Victor J. Lieffers

Physiologia Plantarum > 157 > 1 > 85 - 94

This study tested how wind in daytime and nighttime affects hydraulic properties and thigmomorphogenic response of poplar saplings. It shows that wind in daytime interrupted water balance of poplar plants by aggravating cavitation in the stem xylem under high xylem tension in the daytime, reducing water potential in midday and hence reducing gas exchange, including stomatal conductance and CO₂ assimilation...

article

Natural regeneration of forest vegetation on legacy seismic lines in boreal habitats in Alberta’s oil sands region

Cassidy K. van Rensen, Scott E. Nielsen, Barry White, Tim Vinge, more

Biological Conservation > 2015 > 184 > C > 127-135

Mapping of oil reserves involves the use of seismic lines (linear disturbances) to determine both their location and extent. Conventional clearing techniques for seismic assessment have left a legacy of linear disturbances that cause habitat fragmentation. Little is known, however, about how local and landscape factors affect natural regeneration patterns of trees and shrubs on seismic lines that...

article

Forest floor protection during drilling pad construction promotes resprouting of aspen

Sascha Bachmann, Victor J. Lieffers, Simon M. Landhäusser

Ecological Engineering > 2015 > 75 > Complete > 9-15

Drilling pads that are used to explore petroleum reserves in the boreal forest are often only used for a short time. We studied the vegetative regeneration potential of aspen (Populus tremuloides) through root suckers as a means to rapidly recover forest vegetation in these disturbed sites. We compared protecting the original forest floor under a layer of subsoil during the leveling of drilling pads,...

article

Too much of a good thing: landscape-scale facilitation eventually turns into competition between a lepidopteran defoliator and a bark beetle

Devin W. Goodsman, Jeric S. Goodsman, Daniel W. McKenney, Victor J. Lieffers, more

Landscape Ecology > 2015 > 30 > 2 > 301-312

Context Species distributions are influenced by how individuals interact with conspecifics, how they interact with other species, and by abiotic environmental factors. Resolving the nature of interspecific interactions using the relative spatial distributions of multiple species can therefore be considered an inverse problem. Objective We wished to determine whether defoliation by a lepidopteran...

article

Divergent Pathways of Successional Recovery for In Situ Oil Sands Exploration Drilling Pads on Wooded Moderate‐Rich Fens in Alberta, Canada

Richard T. Caners, Victor J. Lieffers

Restoration Ecology > 22 > 5 > 657 - 667

Peatlands in northern Alberta, Canada, are being rapidly impacted by oil sands activities, with potentially long‐term consequences for their recovery. In situ oil sands extraction requires exploration of oil resources on a dense network of drilling pads across the landscape. This study examined the recovery of wooded moderate‐rich (WMR) fens 10 years after abandonment of these sites with minimal restorative...

article

Depth of root placement, root size and carbon reserves determine reproduction success of aspen root fragments

Julia Wachowski, Simon M. Landhäusser, Victor J. Lieffers

Forest Ecology and Management > 2014 > 313 > Complete > 83-90

The vegetative recovery of species capable of resprouting is strongly driven by the disturbance type, the resprouting traits of the species, and the resource availability in the surviving tissues. Since aspen (Populus tremuloides) commonly regenerates from root suckers after disturbance; we can take advantage of its ability to sprout by applying salvaged surface soils containing aspen root fragments...

article

Variation in carbon availability, defense chemistry and susceptibility to fungal invasion along the stems of mature trees

Devin W. Goodsman, Inka Lusebrink, Simon M. Landhäusser, Nadir Erbilgin, more

New Phytologist > 197 > 2 > 586 - 594

If carbon (C) sinks withdraw carbohydrates as they are transported along tree stems, carbohydrate availability may depend on local sink strength and distance from sources. Defenses, including monoterpenes – a major component of resin – limit the invasibility of pines. Since carbohydrate reserves fund monoterpene synthesis, we hypothesized that monoterpene concentrations in pine stems would decrease...

article

Partitioning of carbon allocation to reserves or growth determines future performance of aspen seedlings

Simon M. Landhäusser, Bradley D. Pinno, Victor J. Lieffers, Pak S. Chow

Forest Ecology and Management > 2012 > 275 > Complete > 43-51

Increasingly, trembling aspen (Populus tremuloides Michx.) is being planted in stressful situations such as forest land reclamation, afforestation and forest restoration in North America. This is due to its fast potential for growth and high resiliency, but its indeterminate growth strategy provides a special challenge in creating suitable planting stock for these sites. Clues from naturally established...

article

Factors affecting white spruce and aspen survival after partial harvest

Kevin A. Solarik, W. Jan A. Volney, Victor J. Lieffers, John R. Spence, more

Journal of Applied Ecology > 49 > 1 > 145 - 154

1. Variable retention harvest is an increasingly popular management alternative to clear‐cutting in boreal forest ecosystems. This harvest system retains a portion of the mature trees to maintain structural elements of the forest and preserve biodiversity. Residual trees must, however, survive in the post‐harvest environment to realize these benefits. Here, we investigate which tree and stand characteristics...

article

Effect of stock type characteristics and time of planting on field performance of aspen (Populus tremuloides Michx.) seedlings on boreal reclamation sites

Simon M. Landhäusser, Javier Rodriguez-Alvarez, Eckehart H. Marenholtz, Victor J. Lieffers

New Forests > 2012 > 43 > 5-6 > 679-693

Aspen (Populus tremuloides Michx) has great potential as a reclamation species for mining sites in the boreal forest, but planting stock has shown poor field performance after outplanting. In this study we tested how different aspen seedling characteristics and planting times affect field outplanting performance on reclamation sites. We produced three different types of aspen planting stock, which...

article

Defoliation increases risk of carbon starvation in root systems of mature aspen

Simon M. Landhäusser, Victor J. Lieffers

Trees > 2012 > 26 > 2 > 653-661

Large trees are noted to decline and die over several years after defoliation or extended periods of drought. The underlying mechanisms of this decline are thought to be driven by moisture limitations to photosynthesis, but alternative considerations also suggest carbon storage limitations as a driver. This research assesses the non-structural carbohydrate reserves in crowns and roots tissues during...

article

Measuring whole-plant transpiration gravimetrically: a scalable automated system built from components

Damián Cirelli, Victor J. Lieffers, Melvin T. Tyree

Trees > 2012 > 26 > 5 > 1669-1676

Measuring whole-plant transpiration is highly relevant considering the increasing interest in understanding and improving plant water use at the whole-plant level. We present an original software package (Amalthea) and a design to create a system for measuring transpiration using laboratory balances based on the readily available commodity hardware. The system is modular, capable of multiple-balance...

article

Ectomycorrhizal community responses to intensive forest management: thinning alters impacts of fertilization

François P. Teste, Victor J. Lieffers, Stephen E. Strelkov

Plant and Soil > 2012 > 360 > 1-2 > 333-347

Background and Aims Carbon and nutrient cycling are influenced by ectomycorrhizal (EM) fungi in forests. Factors altering carbon allocation in trees are likely to alter EM fungal community composition. We aimed to determine the effects of high fertilization, thinning, and their interaction on EM fungal communities and fine roots. Methods Roots and EM fungi were sampled three years after establishment...

article

Snow damage in lodgepole pine stands brought into thinning and fertilization regimes

François P. Teste, Victor J. Lieffers

Forest Ecology and Management > 2011 > 261 > 11 > 2096-2104

Several heavy wet snowfalls occurred during 2007–2009 across a broad-scale thinning and fertilization experiment to bring overstocked juvenile lodgepole pine (Pinus contorta var. latifolia) in the foothills of Alberta, Canada into an intensive management regime. We examined the bending and breakage of trees in relation to thinning and fertilization and used a multimodel information-theoretic approach...

article

Fertilization of lodgepole pine trees increased diameter growth but reduced root carbohydrate concentrations

Devin W. Goodsman, Victor J. Lieffers, Simon M. Landhäusser, Nadir Erbilgin

Forest Ecology and Management > 2010 > 260 > 10 > 1914-1920

Tree growth variables and more complex derived variables such as vigor index have all been linked to the ability of lodgepole pine (Pinus contorta var latifolia) trees to defend against insect herbivores, particularly mountain pine beetle (Dendroctonus ponderosae Hopkins, Coleoptera: Curculionidae). These variables are considered indirect measures of carbohydrate reserves. Trees with high vigor index...

article

Hydraulic acclimation to shading in boreal conifers of varying shade tolerance

AMANDA L. SCHOONMAKER, UWE G. HACKE, SIMON M. LANDHÄUSSER, VICTOR J. LIEFFERS, more

Plant, Cell & Environment > 33 > 3 > 382 - 393

The purpose of this study was to determine how shading affects the hydraulic and wood‐anatomical characteristics of four boreal conifers (Pinus banksiana, Pinus contorta, Picea glauca and Picea mariana) that differ in shade tolerance. Plants were grown in an open field and under a deciduous‐dominated overstory for 6 years. Sapwood‐ and leaf‐area specific conductivity, vulnerability curves, and anatomical...

article

Regeneration of Populus nine years after variable retention harvest in boreal mixedwood forests

Tomasz Gradowski, Victor J. Lieffers, Simon M. Landhäusser, Derek Sidders, more

Forest Ecology and Management > 2010 > 259 > 3 > 383-389

Aspen and balsam poplar regeneration from root suckers were assessed in boreal mixedwood forests nine years after logging in a variable retention experiment (EMEND Project—Ecosystem Management Emulating Natural Disturbance) located north of Peace River, Alberta, Canada. Five levels of retention of mature trees (2%, 10%, 20%, 50% or 75% of the original basal area) were applied in stands dominated by...

article

Propagating trembling aspen from root cuttings: impact of storage length and phenological period of root donor plants

Jessica Snedden, Simon M. Landhäusser, Victor J. Lieffers, Lee R. Charleson

New Forests > 2010 > 39 > 2 > 169-182

Two experiments were conducted to examine the effects of growing conditions, duration of cold storage, and distinct phenological periods of root donor plants on the propagation success of aspen rootlings. Root donor plants were produced either under greenhouse or open grown conditions. Root cuttings were periodically collected from donor plants that had been stored for various lengths of time in cold...

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Keywords

POPULUS TREMULOIDES (9)
BOREAL FOREST (6)
COMPETITION (6)
BOREAL (5)
DISTURBANCE (5)
ASPEN (4)
SOIL TEMPERATURE (4)
DENDROECOLOGY (3)
LODGEPOLE PINE (3)
MICROTOPOGRAPHY (3)
MORTALITY (3)
SEEDLING QUALITY (3)
SILVICULTURE (3)
POPULUS TREMULOIDES (2)
POPULUS TREMULOIDES (2)
CARBOHYDRATE (2)
CARBOHYDRATE RESERVES (2)
CARBON ALLOCATION (2)
CONDUCTIVITY (2)
DEFOLIATION (2)
FOREST REGENERATION (2)
FOREST RESTORATION (2)
GROWTH EFFICIENCY (2)
LEAF AREA (2)
MOUNDING (2)
PEATLAND (2)
PINUS CONTORTA VAR. LATIFOLIA (2)
REGENERATION (2)
SOIL COMPACTION (2)
STAND DYNAMICS (2)
TREE BENDING (2)
VEGETATIVE REGENERATION (2)
WHITE SPRUCE (2)
WIND SPEED (2)
PINUS CONTORTA (1)
ARMILLARIA (POURRITURE DES RACINES) (1)
ARMILLARIA ROOT ROT (1)
DENDROCTONUS (1)
AKAIKE'S INFORMATION CRITERION (AIC) (1)
ALBERTA (1)
ALLOCATION (1)
APICAL DOMINANCE (1)
ASPEN SUCKERING (1)
ASYMMETRIC COMPETITION (1)
ATMOSPHERIC COUPLING (1)
BARK BEETLE (1)
BEETLE (1)
BENDING MOMENT (1)
BOREAL MIXED FOREST (1)
BROWN MOSS (1)
BUDWORM (1)
C-LIMITATION IN ROOTS (1)
CANADIAN ROCKY MOUNTAINS (1)
CARBON RESERVE ALLOCATION (1)
CAUSALITY (1)
CAVITATION (1)
CHICOT (1)
CLASSIFICATION AND REGRESSION TREE ANALYSIS (1)
CLIMATE WARMING (1)
CLONAL PROPAGATION (1)
CLONAL REGENERATION (1)
CLONAL TREES (1)
COARSE WOODY DEBRIS (1)
COLD STORAGE (1)
COLONIZATION (1)
COMMUNITY ECOLOGY (1)
COMPETITION INDEX (1)
COMPÉTITION (1)
CONIFER (1)
CROWN ASYMMETRY (1)
CROWN CLASS (1)
CROWN COLLISION (1)
CROWN COLLISIONS (1)
CROWN COVER (1)
CROWN SHYNESS (1)
CROWN VOLUME (1)
DAMAGE (1)
DECOMPOSITION (1)
DEFENSE (1)
DENDROCHRONOLOGY (1)
DIAMETER (1)
DISTANCE DEPENDENCE (1)
DISTANCE DÉPENDANTE (1)
DOWNED LOGS (1)
ECTOMYCORRHIZA (1)
EMEND (1)
EROSION (1)
EVERGREEN LIGHT AND TEMPERATURE RESPONSE PHYSIOLOGY SUMMERGREEN UNDERSTORY HERBS (1)
FACILITATION (1)
FERTILIZATION (1)
FINE ROOTS (1)
FOREST FLOOR DISTURBANCE (1)
FOREST MANAGEMENT (1)
FOREST PRODUCTIVITY (1)
FOREST RECLAMATION (1)
FORÊT BORÉALE MIXTE (1)
FROST (1)
FROZEN SAPWOOD (1)
GEL (1)
GRAVIMETRIC (1)
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Data set

Springer (23)
Elsevier (17)
Wiley (7)

INFONA - science communication portal

Search results for: Victor J. Lieffers

Rapid understory plant recovery following forest floor protection on temporary drilling pads

Re-establishment of hummock topography promotes tree regeneration on highly disturbed moderate-rich fens

Daytime and nighttime wind differentially affects hydraulic properties and thigmomorphogenic response of poplar saplings

Natural regeneration of forest vegetation on legacy seismic lines in boreal habitats in Alberta’s oil sands region

Forest floor protection during drilling pad construction promotes resprouting of aspen

Too much of a good thing: landscape-scale facilitation eventually turns into competition between a lepidopteran defoliator and a bark beetle

Divergent Pathways of Successional Recovery for In Situ Oil Sands Exploration Drilling Pads on Wooded Moderate‐Rich Fens in Alberta, Canada

Depth of root placement, root size and carbon reserves determine reproduction success of aspen root fragments

Variation in carbon availability, defense chemistry and susceptibility to fungal invasion along the stems of mature trees

Partitioning of carbon allocation to reserves or growth determines future performance of aspen seedlings

Factors affecting white spruce and aspen survival after partial harvest

Effect of stock type characteristics and time of planting on field performance of aspen (Populus tremuloides Michx.) seedlings on boreal reclamation sites

Defoliation increases risk of carbon starvation in root systems of mature aspen

Measuring whole-plant transpiration gravimetrically: a scalable automated system built from components

Ectomycorrhizal community responses to intensive forest management: thinning alters impacts of fertilization

Snow damage in lodgepole pine stands brought into thinning and fertilization regimes

Fertilization of lodgepole pine trees increased diameter growth but reduced root carbohydrate concentrations

Hydraulic acclimation to shading in boreal conifers of varying shade tolerance

Regeneration of Populus nine years after variable retention harvest in boreal mixedwood forests

Propagating trembling aspen from root cuttings: impact of storage length and phenological period of root donor plants

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