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Keyword: competition

Impact of wind-induced microsites and disturbance severity on tree regeneration patterns: Results from the first post-storm decade

Publications Posted on: August 17, 2015
In two hemiboreal mixed spruce-hardwood forests in north-east Estonia, we studied (1) which factors affect tree regeneration survival and development during the first post-storm decade and (2) how these effects change in time. Regeneration height and mortality of the tree species black alder (Alnus glutinosa (L.) J.

Can native annual forbs reduce Bromus tectorum biomass and indirectly facilitate establishment of a native perennial grass?

Publications Posted on: October 03, 2014
Restoration is challenging in systems invaded by competitive, disturbance oriented plants, but greater success may be achieved by mimicking natural successional processes and including disturbanceoriented natives in a seed mix. We asked whether seven native annual forbs from the Great Basin Desert, USA, were capable of reducing biomass of the invasive annual grass Bromus tectorum, and if competition between forbs and B.

Restoring abandoned agricultural lands in cold desert shrublands: Tradeoffs between water availability and invasive species

Publications Posted on: September 28, 2014
Restoration of abandoned agricultural lands to create resilient ecosystems in arid and semi-arid ecosystems typically requires seeding or transplanting native species, improving plant-soil-water relations, and controlling invasive species. We asked if improving water relations via irrigation or surface mulch would result in negative tradeoffs between native species establishment and invasive species competition.

Patterns of growth dominance in forests of the Rocky Mountains, USA

Publications Posted on: September 26, 2014
We used data from 142 stands in Colorado and Wyoming, USA, to test the expectations of a model of growth dominance and stand development. Growth dominance relates the distribution of growth rates of individual trees within a stand to tree sizes. Stands with large trees that account for a greater share of stand growth than of stand mass exhibit strong growth dominance.

Seed size and provenance mediate the joint effects of disturbance and seed predation on community assembly

Publications Posted on: September 26, 2013
Local plant community assembly is influenced by a series of filters that affect the recruitment and establishment of species. These filters include regional factors that limit seeds of any given species from reaching a local site as well as local interactions such as post-dispersal seed predation and disturbance, which dictate what species actually establish.

Long-term (13-year) effects of repeated prescribed fires on stand structure and tree regeneration in mixed-oak forests

Publications Posted on: October 18, 2012
The survival and growth of oak advance regeneration is often limited by shade-tolerant species that are abundant in the understory of oak stands. Evidence of historic burning has prompted the use of prescribed fire as a tool to improve the competitive status of oak regeneration in mature stands. A primary shortfall of fire effects research in oak forests has been a lack of long-term studies on the effects of multiple fires.

Established native perennial grasses out-compete an invasive annual grass regardless of soil water and nutrient availability

Publications Posted on: August 15, 2012
Competition and resource availability influence invasions into native perennial grasslands by nonnative annual grasses such as Bromus tectorum. In two greenhouse experiments we examined the influence of competition, water availability, and elevated nitrogen (N) and phosphorus (P) availability on growth and reproduction of the invasive annual grass B. tectorum and two native perennial grasses (Elymus elymoides, Pascopyrum smithii).

Influence of overstory removal and western spruce budworm defoliation on growth of advance conifer regeneration in Montana

Publications Posted on: January 05, 2012
Twelve-year postharvest diameter growth of advance Douglas-fir, Engelmann spruce, and subalpine fir regeneration and 11-year height growth of Douglas-fir and subalpine fir accelerated in response to decreasing competition. Competition was reflected in degree of overstory removal and change in plot basal area.

Nonnative plant response to silvicultural treatments: A model based on disturbance, propagule pressure, and competitive abilities

Publications Posted on: September 27, 2011
Invasion by nonnative plants can result in substantial adverse effects on the functions of native forest ecosystems, including nutrient cycling and fire regimes. Thus, forest managers need to be aware of the potential impacts of management activities, including silvicultural treatments, on nonnative vegetation.

Disturbance, resource pulses and invasion: short-term shifts in competitive effects, not growth responses, favour exotic annuals

Publications Posted on: September 27, 2011
Increased resource availability and resource pulses often promote invasion by exotic invasive plants, but the relative importance of increased resource supply for invaders with different life histories is likely to vary. It is also unclear whether increased resources allow invaders to outgrow their native neighbours or alter the outcome of competition.