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Keyword: dendrochronology

Low stand density moderates growth declines during hot droughts in semi-arid forests

Publications Posted on: October 02, 2020
1. Increasing heat and aridity in coming decades is expected to negatively impact tree growth and threaten forest sustainability in dry areas. Maintaining low stand density has the potential to mitigate the negative effects of increasingly severe droughts by minimizing competitive intensity. 2. However, the direct impact of stand density on the growing environment (i.e.

Tree-ring reconstruction of bark beetle regimes in Kazakhstan spruce forests

Science Spotlights Posted on: September 02, 2020
Less than 5% of Kazakhstan is forested, so those forests are highly valued for erosion prevention, water retention, timber, and recreation. Yet little is known about their ecology or threats to forest health. A 200-year tree-ring reconstruction by RMRS scientists and collaborators indicates that bark beetles have historically posed little threat to these forests.

Tree-ring reconstruction of bark beetle disturbances in the Picea schrenkiana Fisch. et Mey. Forests of Southeast Kazakhstan

Publications Posted on: August 16, 2020
Ips hauseri Reitter is themost important bark beetle on Picea schrenkiana in southeastKazakhstan, but its biology, ecology, and outbreak dynamics are poorly known. We dendrochronologically reconstructed a 200-year history of disturbances in the Kazakh Tien Shan P. schrenkiana forests.

Creosote growth rate and reproduction increase in postfire environments

Publications Posted on: August 16, 2020
Human activities are changing patterns of ecological disturbance globally. In North American deserts, wildfire is increasing in size and frequency due to fuel characteristics of invasive annual grasses. Fire reduces the abundance and cover of native vegetation in desert ecosystems.

Nondestructive age estimation of mountain big sagebrush (Artemisia tridentata ssp. vaseyana) using morphological characteristics

Publications Posted on: September 14, 2019
Current methods for determining plant age of shrub species require destructive sampling and annual growth ring analysis on the primary stem. Although individual plant ages can frequently be determined in this manner, the method is time consuming and of limited value for plants that have lost stem wood from stem splitting and rot.

Identifying old trees to inform ecological restoration in montane forests of the central Rocky Mountains, USA

Publications Posted on: April 05, 2019
Old trees (defined here as ≥150 years old) can be rare in many forests because of past timber harvest, uncharacteristically severe wildfires, and - increasingly - climate change. Old trees provide unique structural, ecological, scientific, and aesthetic values missing in forests containing only younger trees.

A multi-century history of fire regimes along a transect of mixed-conifer forests in central Oregon, U.S.A

Publications Posted on: December 14, 2018
Dry mixed-conifer forests are widespread in the interior Pacific Northwest, but their historical fire regimes are poorly characterized, in particular the relative mix of low- and high-severity fire. We reconstructed a multi-century history of fire from tree rings in dry mixed-conifer forests in central Oregon. These forests are dominated by ponderosa pine (Pinus ponderosa Lawson & C.

Climatic drivers of ponderosa pine growth in central Idaho

Publications Posted on: December 04, 2018
Despite the widespread use of ponderosa pine as an important hydroclimate proxy, we actually understand very little about its climate response in the Northern Rockies. Here, we analyze two new ponderosa pine chronologies to investigate how climate influences annual growth.

When tree rings go global: Challenges and opportunities for retro- and prospective insight

Publications Posted on: December 04, 2018
The demand for large-scale and long-term information on tree growth is increasing rapidly as environmental change research strives to quantify and forecast the impacts of continued warming on forest ecosystems. This demand, combined with the now quasi-global availability of tree-ring observations, has inspired researchers to compile large tree-ring networks to address continental or even global-scale research questions.

Looking Into the Past: How Reconstructing Historical Forest Conditions Can Help Future Restoration Efforts

Documents and Media Posted on: November 14, 2018
This Science You Can Use in 5 Minutes looks at ponderosa-dominating forests and how looking at historical structures helps restore these forests. Document Type: Other Documents