Biology Agriculture Aquaculture Horticulture Postharvest Forestry Geography Environment Health





Variation in post-wildfire regeneration of boreal mixedwood forests: underlying factors and implications for natural disturbance-based management

submitted by sinteno 6 months ago
To test the direct regeneration hypothesis and support natural disturbance-based forest management we characterized the structure and composition of boreal mixedwood forests regenerating after large wildfires and examined the influence of pre-fire stand composition and post-fire competing vegetation. In stands which had been deciduous (Populus sp.)-dominated, conifer (white spruce)-dominated, or mixed pre-fire we measured regeneration stocking (presence in 10 m2 plots), density and height 10–20 years post-burn in five wildfires in Alberta, Canada. Most plots regenerated to the deciduous or mixed stocking types; plots in the older fire and in stands that were pure conifer pre-fire had higher amounts of conifer regeneration. Surprisingly, regeneration in pre-fire ‘pure’ white spruce stands was most often to pine, although these had not been recorded in the pre-fire inventory. Pre-fire deciduous stands were the most resilient in that poplar species dominated their post-fire regeneration in terms of stocking, density and height. These stands also had the highest diversity of regenerating tree species and the most unstocked plots. High grass cover negatively affected regeneration density of both deciduous and conifer trees. Our results demonstrate the natural occurrence of regeneration gaps, pre- to post-fire changes in forest composition, and high variation in post-fire regeneration composition. These should be taken into consideration when developing goals for post-harvest regeneration mimicking natural disturbance.


Topic: Forestry

Add your comment

Please Login or Signup to leave a comment

Related stories

Tree community structural development in young boreal forests: A comparison of fire and harvesting disturbance
submitted by kawhishe 10 months ago - Topic: Forestry
Although natural disturbance-based management systems support the use of clearcut harvesting as a means of emulating fire disturbance in boreal forest, there are continual concerns and uncertainties over the degree to which clearcutting alters forest ecosystem dynamics relative to wildfire. Here, we sampled 56 and 47 post-fire and post-harvest stands, respectively, to examine early tree communi...

Dead wood and polypore diversity in natural post-fire succession forests and managed stands – Lessons for biodiversity management in boreal forests
submitted by dibjet 1 year and 9 months ago - Topic: Forestry
We tested the extent to which forestry mimics natural stand-replacing fire dynamics, and what factors best explain species richness and assemblages of polyporous fungi in natural northern boreal Picea abies-dominated forests and managed forests which were either clear-cut and planted with pine, or selectively logged. The amount of coarse woody debris (CWD) and diversity of polypores in old-grow...

A GIS-based integrated approach predicts accurately post-fire Aleppo pine regeneration at regional scale
submitted by stillo 2 years and 1 month ago - Topic: Forestry
This study investigates post-fire natural regeneration of Aleppo pine (Pinus halepensis) forests at Ilia region (Peloponnesus, Greece) following the catastrophic fire of 27. The objective of this study is the prediction of P. halepensis post-fire regeneration at a regional scale through an integrated geographic information systems (GIS) model as a basis for post-fire management plans. The model...

Differential Effects of Post-Fire Habitat Legacies on Beta Diversity Patterns of Saproxylic Beetles in the Boreal Forest
submitted by chakks 1 year and 3 months ago - Topic: Biology
Fire-generated mosaics of habitat legacies such as dead and dying trees are key structural components in boreal forest ecosystems that support diverse saproxylic beetles. Our study sought to elucidate the spatial pattern of community composition (beta diversity) of saproxylic beetles along gradients of post-fire habitat legacies (tree species composition, tree size [dbh], and burn severities) a...

Explaining Interspecific Differences in Sapling Growth and Ghade Tolerance in Temperate Forests
submitted by olsefi 1 year and 1 month ago - Topic: Biology
Species differences in growth and shade tolerance might contribute to coexistence of tree species. To explore how such differences depend on underlying plant traits, 14 tree species were investigated in temperate forests on sand and loess soils in the Netherlands. Plant traits were measured for 0.5-1 m tall saplings: 10 saplings growing at low light conditions and 10 at high light conditions. G...

Forest protection and forest harvest as strategies for ecological sustainability and climate change mitigation
submitted by beaanso32 2 years and 1 month ago - Topic: Forestry
An important consideration in forest management to mitigate climate change is the balance between forest carbon (C) storage and ecological sustainability. We explore the effects of management strategies on tradeoffs between forest C stocks and ecological sustainability under five scenarios, three of which included management and two scenarios which provide baselines emulating the natural forest...

Understanding recruitment failure in tropical tree species: Insights from a tree-ring study
submitted by kawhishe 8 months ago - Topic: Forestry
Many tropical tree species have population structures that exhibit strong recruitment failure. While the presence of adult trees indicates that appropriate regeneration conditions occurred in the past, it is often unclear why small individuals are absent. Knowing how, when and where these tree species regenerate provides insights into their life history characteristics. Based on tree age distri...

A new approach to ecological land classification for the Canadian boreal forest that integrates disturbances
submitted by otteke 7 months ago - Topic: Biology
Traditional approaches to ecological land classification (ELC) can be enhanced by integrating, a priori, data describing disturbances (natural and human), in addition to the usual vegetation, climate, and physical environment data. To develop this new ELC model, we studied an area of about 175,000 km2 in the Abies balsamea–Betula papyrifera and Picea mariana-feathermoss bioclimatic domains o...

Small mammals exhibit limited spatiotemporal structure in Sierra Nevada forests
submitted by poddeikeoa 7 months ago - Topic: Biology
Forests in the Sierra Nevada, similar to those across the continent, have been substantially altered by logging, fire exclusion, and other human activities. Current forest management emphasizes maintenance or restoration of resiliency in the face of contemporary disturbance factors that include wildfire, climate change, continued urbanization, and invasive species. We evaluated responses of sma...

Effect of age and disturbance on decadal changes in carbon stocks in managed forest landscapes in central Canada
submitted by 8miladiis 1 year and 3 months ago - Topic: Geography
Forests have the potential to be a sink in the global carbon (C) budget and thus play an important role in mitigating climate change. However, large-scale management of forests to their sink potential requires understanding of factors responsible for changes in forest C stocks. In this paper, we quantify the effects of initial forest landscape condition and disturbance rates on landscape-level ...

Cardiovascular Pharmacogenomics: Expectations and Practical Benefits
submitted by sarish 5 months ago - Topic: Health
Cardiovascular disease is a leading cause of morbidity and mortality worldwide. Pharmacogenomics is the study of genetic determinants of interindividual variation in drug response and aims to facilitate personalized medicine, through genotype-informed drug and dose selection, to maximize drug efficacy and/or minimize adverse drug reactions. Despite high expectations, no cardiovascular pharmacog...

The impact of climate variation and disturbances on the carbon balance of forests in Hokkaido, Japan
submitted by chorlis 5 months ago - Topic: Geography
We evaluated the long-term effect of climate, disturbance, and subsequent recovery on the carbon balance of temperate-boreal forest using the process-based ecosystem model VISIT. The study sites are artificial larch forests, which were planted after clear-cutting of mixed forest, in Hokkaido, Japan. In this study, three experimental simulations were conducted. First, we performed a baseline sim...

Methods for Measuring, Enhancing, and Accounting for Medication Adherence in Clinical Trials
submitted by sarish 2 months ago - Topic: Health
Adherence to rationally prescribed medications is essential for effective pharmacotherapy. However, widely variable adherence to protocol-specified dosing regimens is prevalent among participants in ambulatory drug trials, mostly manifested in the form of underdosing. Drug actions are inherently dose and time dependent, and as a result, variable underdosing diminishes the actions of trial medic...

The Impact of MIR137 on Dorsolateral Prefrontal–Hippocampal Functional Connectivity in Healthy Subjects
submitted by bioagri 3 months ago - Topic: Health
A recent mega-analysis combining genome-wide association study data revealed that a variant of microRNA 137 (MIR137) exhibits the most significant association with schizophrenia. Other biological evidence also consistently suggests that MIR137 may have a pivotal role in the pathogenesis of schizophrenia. However, the underlying neural mechanism remains unclear. As the disrupted dorsolateral pre...

Melanoma epigenetics: novel mechanisms, markers, and medicines
submitted by miow 27 days ago - Topic: Health
The incidence and mortality rates of cutaneous melanoma continue to increase worldwide, despite the deployment of targeted therapies. Recently, there has been rapid growth and development in our understanding of epigenetic mechanisms and their role in cancer pathobiology. Epigenetics—defined as the processes resulting in heritable changes in gene expression beyond those caused by altera...