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Keyword: seedling establishment

The complexities behind restoration and reforestation efforts

Science Spotlights Posted on: July 24, 2017
Restoration and reforestation using nursery-produced seedlings can be an effective means of increasing successful establishment and rapid growth following outplanting. This, in turn, can accelerate the recovery trajectory of these ecosystems. However, in many ecosystems of the world, seasonal changes as well as changing climate can create dry conditions that are not favorable to seedling establishment.

Long-term thinning alters ponderosa pine reproduction in northern Arizona

Science Spotlights Posted on: August 17, 2016
Building upon existing long-term studies in the Taylor Woods of the Fort Valley Experimental Forest, this study tested the relationship between overstory density and seedling survival in ponderosa pine forests. A long term experiment in northern Arizona was used to investigate the impacts of repeated stand thinning. This study provides valuable information that will guide forest managers in incorporating regeneration goals into forest managment plans.

Long-term thinning alters ponderosa pine reproduction in northern Arizona

Publications Posted on: May 23, 2016
The future of ponderosa pine (Pinus ponderosa var. scopulorum) forests in the southwestern United States is uncertain because climate-change-induced stresses are expected to increase tree mortality and place greater constraints on regeneration.

Spatial distribution of ponderosa pine seedlings along environmental gradients within burned areas in the Black Hills, South Dakota

Publications Posted on: May 12, 2016
In 2000, the Jasper fire in the Black Hills, SD, created a mosaic of burned and unburned patches of different sizes within the contiguous ponderosa pine forest. To study the spatial regeneration of ponderosa pine seedlings and the ecological gradients existing between burned and unburned areas two years after fire, we used a transect approach.

Data product for "Role of a native legume in facilitating native vs. invasive species in sagebrush steppe before and after fire"

Datasets Posted on: August 27, 2015
We conducted a field experiment near Reno, Nevada to determine if the native legume, Lupinus argenteus, is able to facilitate seedling establishment in an unburned and burned community in sagebrush steppe. We chose six treatments to identify specific mechanisms by which L.

Seed dispersal is more limiting to grassland diversity than competition or seed predation

Publications Posted on: October 01, 2014
Competition has historically been viewed as the predominant process affecting plant community structure. In particular, it is often assumed that the dominant resident species is the superior competitor and therefore has large impacts on plant community diversity. This assumption, however, is seldom tested.

Grass seedling demography and sagebrush steppe restoration

Publications Posted on: October 01, 2013
Seeding is a key management tool for arid rangeland. In these systems, however, seeded species often fail to establish. A recent study inWyoming big sagebrush steppe suggested that over 90% of seeded native grass individuals die before seedlings emerged. This current study examines the timing and rate of seed germination, seedling emergence, and seedling death related to this demographic bottleneck.

Plant establishment and soil microenvironments in Utah juniper masticated woodlands

Publications Posted on: September 19, 2013
Juniper (Juniperus spp.) encroachment into sagebrush (Artemisia spp.) and bunchgrass communities has reduced understory plant cover and allowed juniper trees to dominate millions of hectares of semiarid rangelands. Trees are mechanically masticated or shredded to decrease wildfire potential and increase desirable understory plant cover.

Predicting germination in semi-arid wildland seedbeds II. Field validation of wet thermal-time models

Publications Posted on: October 04, 2012
Accurate prediction of germination for species used for semi-arid land revegetation would support selection of plant materials for specific climatic conditions and sites. Wet thermal-time models predict germination time by summing progress toward germination subpopulation percentages as a function of temperature across intermittent wet periods or within singular wet periods.

Effects of resource availability and propagule supply on native species recruitment in sagebrush ecosystems invaded by Bormus tectorum

Publications Posted on: September 13, 2010
Resource availability and propagule supply are major factors influencing establishment and persistence of both native and invasive species. Increased soil nitrogen (N) availability and high propagule inputs contribute to the ability of annual invasive grasses to dominate disturbed ecosystems. Nitrogen reduction through carbon (C) additions can potentially immobilize soil N and reduce the competitiveness of annual invasive grasses.