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... Regeneration and survival of forested wetlands are affected by environmental variables related to the hydrologic regime. Climate change, specifically alterations to precipitation patterns, may have outsized effects on these forests. In Tennessee, USA, precipitation has increased by 15% since 1960. The goal of our research was to assess the evidence for whether this change in precipitation patterns ...
Curculionidae; Dendroctonus frontalis; Pinus; USDA Forest Service; bark; bark beetles; climate change; data collection; forest ecosystems; forests; landscapes; normalized difference vegetation index; prediction; risk; risk assessment; summer; temperature; tree mortality; Alabama; Central America; Florida; Georgia; Mexico; South Carolina
Abstract:
... Bark beetles (Coleoptera: Curculionidae) alter forest ecosystem functioning through tree mortality, thus causing billions of dollars in economic and ecological damages worldwide. Dendroctonus frontalis Zimmermann is considered one of the most significant insect pest species of pine (Pinus spp.) trees in the United States (U.S.), Central America, and Mexico. To manage this threat, research has soug ...
... It is important to guarantee the property of biological compatibility when estimating tree biomass of the total and components for carbon accounting under global climate change. The issue was successfully considered in traditional nonlinear regression models, but not for machine learning methods. A new method for approaching the compatibility of tree biomass estimation in ANN (Artificial Neural Ne ...
Abies lasiocarpa; Larix occidentalis; Picea engelmannii; Pinus contorta var. latifolia; Thuja plicata; Tsuga heterophylla; administrative management; dry environmental conditions; ecosystems; fire frequency; fire regime; forest ecology; historic sites; national parks; plant communities; seedlings; serotiny; shrubs; species diversity; trees; understory; Montana
Abstract:
... Recent increases in fire frequency and severity across the western US are triggering abrupt changes in ecosystem structure and composition, especially in lower montane forests, but consequences of fire-regime change for mesic, mixed-conifer forests remain uncertain. Glacier National Park (Montana, USA) is characterized by a complex mosaic of species typical of Rocky Mountain, Pacific Northwest and ...
administrative management; forest ecology; nonlinear mixed effects models; principal component analysis; sample size; tree height; trees
Abstract:
... Tree heights are one of the most important aspects of forest mensuration, but data are often unavailable due to costly and time-consuming field measurements. Therefore, various types of models have been developed for the imputation of tree heights for unmeasured trees, with mixed-effects models being one of the most commonly applied approaches. The disadvantage here is the need of sufficient sampl ...
... The objective of this study was to develop a method for quantitative analysis of height growth in planted Japanese cedar (Cryptomeria japonica) stands at a regional scale. In two model regions (Gujo, Gifu and Kami, Kochi), overall tree height data were measured using airborne LiDAR, and target stand data were extracted by overlaying geographic information from a forest GIS database. A statistical ...
... It has been firmly established that oak regeneration benefits from prescribed burning and reduced competition with fire-intolerant tree species. Despite recommendations for research on the role of the microsite environment for oak regeneration, very little is known about the interacting effects of fire, soil, and surrounding plant community on oak establishment. We collected undisturbed and burned ...
Oregon; Pteridium aquilinum; administrative management; burn severity; fire behavior; fire severity; forest ecology; landscapes; residual forests; secondary forests; species richness; stand development; understory; wildfires; Cascade Mountain region
Abstract:
... Wildfire size and frequency are increasing across the western U.S., affecting large areas of young, second-growth forest originating after logging and burning. Despite their prevalence in the western Cascade landscape, we have a poor understanding of how these young stands respond to fire or how their responses differ from older, undisturbed forests, which are well studied. We explore these questi ...
... Forest dynamics is driven by the formation of gaps, especially in temperate forests. A potentially useful tool for identifying canopy gaps at different spatial scales is remote sensing. Our study used two types of data: (1) high spatial resolution Canopy Height Model (CHM) to detect canopy gaps in the forest and (2) field data to quantify natural and artificial regeneration within the gaps. The st ...
... Scatter-hoarding rodents are important seed predators and dispersers in various forest ecosystems and significantly influence the seed fate and seedling regeneration of many tree species. Canopy openness is believed to have an important influence on the foraging behavior of scatter-hoarding rodents, mainly because of the variation in predation risk between open and canopy microsites. Most of the c ...
... The eco-cultural nature of ancient woods and forest landscapes in the UK is well-established. Furthermore, the loss of cultural knowledge and memories as traditional management reduced and in many cases ceased during the twentieth century presents challenges for site conservation and that of the eco-cultural resources. Additionally, both tangible and intangible cultural heritage of these landscape ...
... Examining ecosystem functioning of logged-over forests requires a quantitative trait-based monitoring approach, in addition to a taxonomic approach, which allows for evaluation of the accompanying shifts in species traits and functional composition. Our study evaluated forest regrowth after different logging and thinning techniques applied to 60 one-hectare forest subplots in East Kalimantan that ...
... The Seychelles granitic islands have been small, mid-oceanic, equatorial, mountainous and moist islands for at least 50 million years, with an uninterrupted vegetation cover since their separation from Gondwana. Therefore, unlike hotspot oceanic islands that drastically vary in environmental heterogeneity according to their age, the Seychelles can provide observational data where evolutionary time ...
Pinus halepensis; Pinus pinea; climate; climate change; dry environmental conditions; forest ecology; forest inventory; interspecific competition; models; national forests; species diversity; statistical analysis; tree growth; uncertainty; Mediterranean region; Spain
Abstract:
... Competition plays a key role controlling tree growth in mixed forests. Contrary to monocultures, quantifying species mixing influence on tree growth suppose a challenge since the presence of two or more species requires to estimate the degree of intra- and inter-specific competition among trees. Moreover, it is well known that aridity can also influence tree growth, especially in the Mediterranean ...
Abies alba; Fagus sylvatica subsp. sylvatica; Picea abies; Pseudotsuga menziesii; administrative management; canopy; ecosystems; forests; light transmission; natural regeneration; summer; tree and stand measurements; understory; ungulates; vegetation cover; Switzerland
Abstract:
... Douglas fir (Pseudotsuga menziesii) has regenerated naturally in European forests since the middle of the 20ᵗʰ century. Some cases of an invasive character of the species have been reported under specific site conditions, but systematic data on the extent of natural regeneration and spread of Douglas fir across different forest communities are largely lacking. Due to its potential tolerance to inc ...
... Vegetation affects local water balance partitioning via effects on incoming precipitation, local radiation balance and soil hydrological properties. The extent of these effects is related to plant functional traits, such that forest composition plays an important role in its hydrological function. Therefore, the selection of species in forest restoration processes is key to recovering ecological ( ...
... Our understanding of how environmental heterogeneity shapes plant community dynamics is largely based on above-ground diversity despite the importance of seed banks as reservoirs of genetic and taxonomic diversity that buffer plant populations and influence vegetation following disturbance. Using a plant functional trait approach, this study examined the importance of fire-related germination cues ...
... In fire-dependent forest landscapes, frequent low- to moderate-severity fire maintained vegetation patterns that limited the severity of droughts, wildfires, and insect and pathogen activity. More than a century of fire exclusion, in combination with intensive timber management, has altered these spatial patterns and eroded resistance. Today’s much denser forests and highly connected fuel loads ar ...
Arachnida; Coleoptera; Heteroptera; administrative management; arthropods; dead wood; habitats; sample size; species richness; wildlife management
Abstract:
... How many species can live in a specific habitat is a key question in conservation biology. Due to its heterogeneity, deadwood supports highly diverse communities. The total number of species related to deadwood is, however, underestimated by most empirical community studies. First, as most reports on saproxylic species richness do not relate the number of species observed to the sample size used, ...
... In the context of the worldwide increasing interest on the role of forests for global warming and biodiversity targets, there is a growing tendency to consider the need to increase not only the extension of forests, but also their degree of naturalness. These indications have been recently included also in important political documents such as the European Green Deal enacted by the European Union, ...