Sentences with phrase «tree regeneration»

All the fires were followed by a sharp reduction of tree regeneration and consecutive deforestation.

A comparative analysis of the distribution and abundance of black spruce trees and stratigraphy of organic soil horizons at the landscape scale was used to identify the chronology of fire conflagrations and correlative post-fire tree regeneration success.

They found sobering results, including significant decreases in tree regeneration following wildfires in the early 21st century, a period markedly hotter and drier than the late 20th century.

(iii) Sites with charcoal macrofossils beneath the current organic horizon (corresponding to more than 20 % of the sites of the study area) are stands composed of a relatively dense cover (generally between 10 and 40 %) of black spruce trees and shrubs — i.e. sites burned probably more than twice since initial forest establishment with successful tree regeneration because they are currently forming woodlands and krummholz.

(iv) Sites with charcoal macrofossils beneath, in, and above the current organic horizon (corresponding to the large majority of the remaining sites of the study area) are treeless stands composed of a much scattered cover (generally < 1 %) of black spruce shrubs — i.e. sites burned probably more than twice since initial forest establishment, without successful tree regeneration and currently forming lichen - shrub tundra.

Given these a posteriori pattern - and - process combinations, it has been possible to reconstruct the chronology of fire occurrences and correlative tree regeneration of all the study sites over the last 2000 years.

Shaded microsite areas found below mature pinyon pine canopies (or overstory) have lower soil temperature and retain higher soil moisture content, both of which are fundamental to new tree regeneration.

Contrary to widespread belief of northward boreal forest expansion due to recent warming, lack of post-fire recovery during the last centuries, in comparison with active tree regeneration more than 1000 years ago, indicates that the current climate does not favour such expansion.

Sustained tree regeneration (> 10 % cover) was recorded only in sites with charcoal dated to more than 900 cal.

Wetland and lake development in the Rivière Boniface area also showed the same spatiotemporal trend with contrasted tree regeneration and lake - level fluctuations over the last 2000 years (Payette & Delwaide 2004; Asselin & Payette 2006).

According to fire and tree regeneration data from our study, the northern part of the forest tundra in Eastern Canada has been heavily deforested over the last millennium.

Forest limit / line - The upper elevational or latitudinal limit beyond which natural tree regeneration can not develop into a closed forest stand.

Recent mountain pine beetle outbreaks, wildfire severity, and postfire tree regeneration in the US Northern Rockies.

This evaluation was used to measure forest survival over time and correlative success of post-fire tree regeneration.

The institute's research taps into the dynamics of tree regeneration; forest tree eco-physiology and population genetics; agroforestry system management and modelling.

«You couldn't conduct an experiment to demonstrate how birds affect dispersal and tree regeneration because you can't experimentally keep birds out of large areas,» she said.

They wanted to understand if and how changing climate over the last several decades affected post-fire tree regeneration, a key indicator of forest resilience.

Whether he is recounting the relationship between fungi, vole faeces and fir - tree regeneration, or the complexities of fire dynamics, it is, Pastor says, natural observation, those backstories and the painstaking work of recording that are the keys to the storehouse of ecological knowledge.

«A decade after this fire, there was almost no tree regeneration at lower, drier sites,» said Erich Dodson, a researcher with the OSU Department of Forest Ecosystems and Society.

Research Assistant, Institute of Ecosystem Studies, NY (May 00 — Aug 00) The interactions of tree regeneration, rodent and bird populations, and tick density and their effect on the risk of human exposure to vector - borne disease.

According to the distribution of fire dates and tree regeneration, the climate at the tree line was drier and warmer before 900 cal.