scholarly journals Dead wood diversity in a Norway spruce forest from the Calimani National Park (Eastern Carpathians)

2019 ◽  
Vol 25 (2) ◽  
pp. 238-248 ◽  
Author(s):  
Radu Vlad ◽  
Cristian Gheorghe Sidor ◽  
Lucian Dinca ◽  
Cristinel Constandache ◽  
Dan Grigoroaea ◽  
...  
Keyword(s):  
Norway Spruce ◽  
National Park ◽  
Dead Wood ◽  
Nonlinear Models ◽  
Theoretical Distribution ◽  
Stand Age ◽  
Wood Volume ◽  
Spruce Forests ◽  
Eastern Carpathians ◽  
The Dead

The role of dead wood in forests encompasses the preservation of biodiversity, the productivity, and the storage of carbon. In this study, we aimed to investigate the variation of the dead wood volume in a subalpine Norway spruce forests. Using a regular grid, the size of the wood, ordered in a five-class scale for snags and logs and a six-class scale for stumps, was recorded. The relationship between the dead wood volume and site respectively stand characteristics by some predictive factors (stand   age, altitude, human   influence   and   site   productivity) was   modelled   using mixed linear/nonlinear models. Dead wood volume (74.3 m3·ha-1) accounted for 18.3% of the volume (live trees and dead wood). Regarding the dead wood only, snags amounted to 44.8% of the volume and logs and stumps amounted to 46.5, and 8.7%, respectively. Snags (57.5% of the total) and logs (42.8%), were most common in the 2nd decay class, while stumps were most common in the 6th (51.2%). The distribution of the number of dead wood pieces, in terms of diameter, was obtained according to the Meyer theoretical distribution for snags and to the Gamma theoretical distribution for logs and stumps. This study completes the dead wood database from Norway spruce forests in the subalpine area to find the common features across the Carpathians Mountains. It contributes to the understanding of the dead wood dynamics in a young National Park, considering the year of establishment, consists of forests where forestry work was carried out and stands that were exempt from cutting.

scholarly journals Optimal Continuous Cover Forest Management with a Lower Bound Constraint on Dead Wood

2019 ◽  
Vol 66 (2) ◽  
pp. 202-209
Author(s):  
Janne Rämö ◽  
Aino Assmuth ◽  
Olli Tahvonen
Keyword(s):  
Steady State ◽  
Forest Management ◽  
Dead Wood ◽  
Stand Density ◽  
Minor Effect ◽  
Biodiversity Indicator ◽  
Wood Volume ◽  
The Dead ◽  
A Minor ◽  
Timber Harvests

Abstract We analyze economically optimal continuous cover forestry with dead wood as a biodiversity indicator. We study mixed-species stands consisting of Norway spruce (Picea abies [L.] Karst.), birch (Betula pendula Roth.), and other broadleaves (e.g., oak [Quercus sp.], maple [Acer sp.]). The analysis is based on an economic description of continuous cover forest management using an empirically estimated size-structured transition matrix model. We use size-specific decomposition rates for dead wood, with the lower limit on total dead wood volume varying between 0 and 40 m3 ha–1. The optimization problem is solved in its general dynamic form using gradient-based interior point methods. Increasing the dead wood volume requirement affects total stand density only slightly, but increases stand heterogeneity as other broadleaves are grown in higher numbers. In addition, increasing the dead wood requirement has only a minor effect on the total felled volume, but harvests shift from timber harvests to biodiversity fellings to maintain the required dead wood volume. In the optimal steady state with a high dead wood requirement, two harvesting cohorts emerge: one for timber harvests and the other for biodiversity fellings. Increasing the dead wood requirement decreases steady-state net timber income by up to 30 percent compared to the unconstrained solution.

scholarly journals A Permanent Research Platform for Ecological Studies in Intact Temperate Mountainous Forests from Slătioara UNESCO Site and Its Surroundings, Romania

Forests ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 1004
Author(s):  
Gabriel Duduman ◽  
Mihai-Leonard Duduman ◽  
Daniel Avăcăriței ◽  
Ionuț Barnoaiea ◽  
Cătălina-Oana Barbu ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Tree Species ◽  
Dead Wood ◽  
Future Research ◽  
Silver Fir ◽  
Wood Volume ◽  
Square Grid ◽  
Main Research ◽  
Research Platform ◽  
Unesco Site

This paper describes a permanent research platform (PRP) designed and implemented in “Codrul secular Slătioara” and its surroundings (2205.85 ha), having also the role of introductory paper for future research articles based on data collected from this platform. “Codrul secular Slătioara” is known as one of the largest temperate mountainous intact forests of Europe and, in 2017, it was included in UNESCO World Heritage List, as part of the “Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe”. Moreover, the PRP overlaps other three scientific reserves, the share of strictly protected forests exceeding 70%. This platform has a multiple role, being developed for research, conservation and educational activities. The PRP was designed for an ecological analysis of the intact forest ecosystems. It contains 193 circular sample plots, each of them of 500 m2, and it is structured on two levels. The first level contains 58 sample plots corresponding to a square grid of 500 × 500 m, stretching over the entire forested area, and the second level contains 135 plots, placed according to a square grid of 100 × 100 m, covering 136 ha within the core area of the UNESCO site. We measured the characteristics of 8296 living trees, 1743 standing dead trees, 1900 dead wood trunks, 3214 saplings, and the abundance–dominance indices of flora species. Thus, we identified 14 tree species, 17 shrub species, and 248 other cormophyte species forming the herbaceous layer. In terms of volume, the main tree species are Norway spruce, silver fir and European beech. The tallest species are Norway spruce (56 m) and silver fir (51 m). The average volume of living trees is 659 m3·ha−1, with a maximum of 1441 m3·ha−1. The mean total dead wood volume is about 158 m3·ha−1, with sample plots where the total dead wood volume exceeds 600 m3·ha−1. After presenting the results of preliminary data processing, the paper describes the main research topics to be further considered, based on the PRP, and the foresights related to the PRP’s monitoring and development.

Dead-wood effects on enchytraeids and nematodes in thinned and unmanaged Norway spruce forests

2009 ◽  
Vol 24 (4) ◽  
pp. 348-353 ◽  
Author(s):  
Jouni K. Nieminen ◽  
Mustapha Boucelham ◽  
Jari Haimi
Keyword(s):  
Norway Spruce ◽  
Dead Wood ◽  
Spruce Forests

scholarly journals Elevated bark temperature in unremoved stumps after disturbances facilitates multi-voltinism in Ips typographus population in a mountainous forest

2016 ◽  
Vol 62 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Peter Fleischer ◽  
Peter Fleischer ◽  
Ján Ferenčík ◽  
Pavol Hlaváč ◽  
Milan Kozánek
Keyword(s):  
Population Size ◽  
Norway Spruce ◽  
National Park ◽  
Large Scale ◽  
Large Population ◽  
Ips Typographus ◽  
Population Increase ◽  
Spruce Forests ◽  
Two Generations ◽  
Tatra National Park

Abstract The number of Ips typographus generations developed in a year might be indicative of its population size and of risk to Norway spruce forests. Warm weather and unremoved fallen trees after natural disturbances are thought of as key factors initiating large population increase. We studied I. typographus development in a spruce forest of the Tatra National Park, which was heavily affected by large-scale disturbances in the last decade. Repeated windthrows and consequent bark beetle outbreaks have damaged almost 20,000 hectares of mature Norway spruce forests, what is a half of the National Park forest area. Current I. typographus population size and its response to the environment and to forestry defense measures attract attention of all stakeholders involved in natural resource management, including public. In this paper we analyse the potential I. typographus population size in two consecutive years 2014 and 2015, which represented a climatologically normal year and an extremely hot year, respectively. We used bark temperature and phenology models to estimate the number of generations developed in each year. In 2014, the average bark temperature of standing living trees at study sites was 14.5 °C, in 2015 it increased to 15.7 °C. The bark temperature of fallen logs was 17.7 °C in 2014, and 19.5 °C in 2015. The bark temperature of standing living trees allowed to develop one and two generations in 2014 and 2015, respectively. The elevated bark temperature of fallen logs allowed to develop two generations in 2014 and three generations in 2015. The good match between the predicted and observed timing of each generation emergence as well as the large increase in the number of catches in pheromone traps in 2015 indicated a dramatic increase of the I. typographus population in the extremely warm year, especially at the unmanaged windthrown site.

scholarly journals Assessing the resilience of Norway spruce forests through a model-based reanalysis of thinning trials

2017 ◽  
Vol 388 ◽  
pp. 3-12 ◽  
Author(s):  
Rupert Seidl ◽  
Friedrich Vigl ◽  
Günter Rössler ◽  
Markus Neumann ◽  
Werner Rammer
Keyword(s):  
Norway Spruce ◽  
Spruce Forests ◽  
Model Based

Saproxylic insect assemblages in Canadian forests: diversity, ecology, and conservation

2008 ◽  
Vol 140 (4) ◽  
pp. 453-474 ◽  
Author(s):  
David W. Langor ◽  
H.E. James Hammond ◽  
John R. Spence ◽  
Joshua Jacobs ◽  
Tyler P. Cobb
Keyword(s):  
Forest Management ◽  
Boreal Forests ◽  
Dead Wood ◽  
Sustainable Forest Management ◽  
Forest Harvesting ◽  
Stand Age ◽  
Managed Forests ◽  
Saproxylic Insects ◽  
Associated Species ◽  
Experimental Burns

AbstractSaproxylic insect assemblages inhabiting dead wood in Canadian forests are highly diverse and variable but quite poorly understood. Adequate assessment of these assemblages poses significant challenges with respect to sampling, taxonomy, and analysis. Their assessment is nonetheless critical to attaining the broad goals of sustainable forest management because such species are disproportionately threatened elsewhere by the reductions in dead wood generally associated with commercial exploitation of northern forests. The composition of the saproxylic fauna is influenced by many factors, including tree species, degree of decay, stand age, and cause of tree death. Wildfire and forest harvesting have differential impacts on saproxylic insect assemblages and on their recovery in postdisturbance stands. Exploration of saproxylic insect responses to variable retention harvesting and experimental burns is contributing to the development of prescriptions for conserving saproxylic insects in boreal forests. Understanding of processes that determine diversity patterns and responses of saproxylic insects would benefit from increased attention to natural history. Such work should aim to provide a habitat-classification system for dead wood to better identify habitats (and associated species) at risk as a result of forest management. This tool could also be used to improve strategies to better maintain saproxylic organisms and their central nutrient-cycling functions in managed forests.

Lxxix: Conrad's Revision of “the Lighthouse” in Nostromo

PMLA ◽  
1937 ◽  
Vol 52 (4) ◽  
pp. 1183-1190
Author(s):  
George W. Whiting
Keyword(s):  
Dead Wood ◽  
The Other ◽  
Final Version ◽  
Fresh Material ◽  
The Dead ◽  
To Come ◽  
The One ◽  
Consummate Skill

To the student of writing and literature few inquiries are more interesting and valuable than that into an author's practices in revising his own work. To observe the various stages in the evolution of the final version, to note carefully an artist at his work of pruning the dead wood, adding fresh material, smoothing away harsh phrases, selecting just words, and letting light into obscure places—to do this is to come somewhat nearer to an understanding of what in spite of all analysis will remain essentially a mystery. Especially fascinating and instructive is the study of Conrad's revision, for here one sees a supreme artist at work. In his vigorous hewing and rebuilding there is conclusive proof of the artist's untiring industry and consummate skill. Conrad's revision of Nostromo is of particular interest, for this novel occupies a critical place in the evolution of Conrad's prose. Mr. Richard Curie has justly characterized the change that came over Conrad's prose—a change perceptible in the “Amy Foster” of Typhoon and fully marked in from Under Western Eyes onward. This evolution has smoothed away the cadence, has concentrated the manner, has toned down the style of Conrad's former exuberance. At first glance the later and the earlier Conrad appear two totally different men. The unruly splendor of the one has given way to the subtle and elastic suavity of the other … His earlier prose is sometimes uncertain, sometimes exaggerated, but his later prose has the uniform temper of absolute mastery.

scholarly journals Effects of heavy thinnings on the increment and selection of trees for tending in Norway spruce monoculture in natural hazard conditions

2017 ◽  
pp. 31-54
Author(s):  
Martin Bobinac ◽  
Sinisa Andrasev ◽  
Andrijana Bauer-Zivkovic ◽  
Nikola Susic
Keyword(s):  
Norway Spruce ◽  
Growth Stage ◽  
Natural Hazard ◽  
Basal Area ◽  
Growth Potential ◽  
Stand Age ◽  
Diameter Increment ◽  
Volume Increment ◽  
Selection Of ◽  
Area And Volume

The paper studies the effects of two heavy selection thinnings on the increment of Norway spruce trees exposed to ice and snow breaks in eastern Serbia. In a thinning that was carried out at 32 years of age, 556 candidates per hectare were selected for tending, and at the age of 40, of the initial candidates, 311 trees per hectare (55.9%) were selected as future trees. In all trees at 41-50 age period, diameter increment was higher by 31%, basal area increment by 64% and volume increment by 67% compared to 32-40 age period. The collective of indifferent trees is significantly falling behind compared to future trees in terms of increment values in both observed periods. However, the value of diameter, basal area and volume increments, of the collective of "comparable" indifferent trees are lower in comparison to the values of increments of future trees by 10-15% in the 32-40 age period, and by 15-21% in the 41-50 age period and there are no significant differences. The results show that heavy selective thinnings, initially directed at a larger number of candidates for tending at stand age that does not differ much from the period of carrying out first "commercial" thinnings, improve the growth potential of future and indifferent trees, where it is rational to do the tree replacement for the final crop in "susceptible" growth stage to snow and ice breaks.

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