Spatial distribution of injuries to Norway spruce advance growth after selection harvesting

2001 ◽  
Vol 31 (11) ◽  
pp. 1903-1913 ◽  
Author(s):  
Aksel Granhus ◽  
Dag Fjeld
Keyword(s):  
Norway Spruce ◽  
Basal Area ◽  
Injury Rates ◽  
Clear Cutting ◽  
Forest Condition ◽  
Risk Of Injury ◽  
Spatial Risk ◽  
Operational Characteristics ◽  
Selection Harvesting ◽  
Operating Method

Injuries and mortality to advance growth (saplings) after selection harvesting was studied in 17 multistoried Norway spruce (Picea abies (L.) Karst.) stands. Harvest removals ranged from 33 to 67% of initial basal area. Four of the stands were harvested with a motor-manual method (chain saw and skidding with farm tractors; M–FT). The remaining stands were harvested with single-grip harvesters and forwarders (H–FW). In each stand, injury rates were evaluated on a 24 × 48 m plot, located between the centre lines of two parallel strip roads that were spaced 24 m apart. All logging teams had at least 5 years of experience in clear-cutting and thinning operations. The trees to be removed and the strip road centre lines were marked prior to harvest. Mortality varied from 5 to 51%, whereas total injury (injured + dead saplings) varied from 17 to 76%. Mortality and injury levels were generally highest on H–FW plots. Crown reduction and leaning stems were the most frequent types of injury, regardless of operating method. Injury rates increased with sapling height with the H–FW method, whereas the opposite was found on M–FT plots. Saplings without preharvest damage in the form of top or leader defects had a higher probability of being injured than saplings with such damage in stands harvested with the M–FT method. A similar difference was not found on H–FW plots. A logistic regression model shows that the spatial risk of injury depends on the interaction between forest condition factors and operational characteristics. Forest condition factors influencing the risk of injury are sapling height and the location of saplings relative to larger residual trees and strip roads. Corresponding operational characteristics are operating method and harvest intensity.

Development patterns in two hemlock–hardwood stands in southern New England

1986 ◽  
Vol 16 (5) ◽  
pp. 885-891 ◽  
Author(s):  
Matthew J. Kelty
Keyword(s):  
New England ◽  
Canopy Structure ◽  
Basal Area ◽  
Height Growth ◽  
Northern Red Oak ◽  
Red Maple ◽  
Clear Cutting ◽  
Southern New England ◽  
Hardwood Species ◽  
Constant Rate

Two forest stands, composed primarily of northern red oak (Quercusrubra L.), red maple (Acerrubrum L.), and eastern hemlock (Tsugacanadensis (L.) Carr.), were studied by stand-reconstruction techniques to determine the pattern of development of canopy structure. One stand had originated following clear-cutting 87 years ago; the other, following catastrophic windthrow 44 years ago. Juvenile height growth of the hardwood species was much greater than that of hemlock and a stratified canopy developed by age 30 years, with hardwoods forming an overstory canopy above hemlock. Hemlocks maintained overstory positions only if they were 3 m or more in height immediately following canopy disturbance. In the older stand, hardwood height growth was about twice that of the tallest understory hemlocks during the first 30 years. The hardwood overstory slowed after that and grew at the same rate as the tallest understory hemlocks, which maintained a constant rate of height growth, and a constant to accelerating rate of basal area growth for much of the 87-year measurement period. The height growth of the tallest understory hemlocks was apparently limited in part by breakage of terminal shoots, caused by abrasion against branches of overstory hardwood crowns.

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.

Spider assemblage structure and functional diversity patterns in clear-cut, logged, and undisturbed areas in a large Atlantic Forest remnant

2020 ◽  
Vol 50 (7) ◽  
pp. 608-614
Author(s):  
Ronei Baldissera ◽  
Suiane Oliveira de Quadros ◽  
Gabriela Galeti ◽  
Everton Nei Lopes Rodrigues ◽  
Luan M.V. Lazzarotto ◽  
...  
Keyword(s):  
Atlantic Forest ◽  
Species Conservation ◽  
Basal Area ◽  
Selective Logging ◽  
Canopy Openness ◽  
Forest Fragment ◽  
Clear Cut ◽  
Clear Cutting ◽  
Functional Richness ◽  
Forest Remnant

Habitat loss is one of the main consequences of landscape transformation by humans. Monitoring biodiversity changes in areas under different management strategies is fundamental for species conservation. Our study is the first to assess the role of forest disturbance history on spider (Araneae) biodiversity in the westernmost portion of the Atlantic Forest. We analyzed taxonomic and functional aspects of spider assemblages in understories in a large forest fragment in southwestern Brazil. Spiders were sampled in five 30 m × 5 m plots over three seasons in three areas with different management histories: clear-cutting, selective logging, or native plots. We also characterized tree basal area, tree density, and canopy openness. The clear-cut plots showed more canopy openness and low habitat heterogeneity due to the high density of one pioneer native tree species. Forest structure in selective logging and native plots was similar. Spider richness, abundance, and functional richness were affected only by the season. Species composition also differed among the areas depending on the season. The abundance of web-building species was mainly associated with clear-cut areas in winter and spring. These results highlight the importance of natural regeneration in the Atlantic Forest after disturbance for the conservation of regional spider biodiversity.

scholarly journals Breeding value of Norway spruce (Picea abies [L.] Karst.)

2012 ◽  
Vol 50 (No. 1) ◽  
pp. 17-23
Author(s):  
Rożkowski KR
Keyword(s):  
Survival Rate ◽  
Norway Spruce ◽  
Growth Traits ◽  
Block Design ◽  
Basal Area ◽  
Tree Height ◽  
Breeding Value ◽  
Cross Sectional ◽  
Qualitative Traits ◽  
Crown Density

This is the first report on measurements and observations of an experimental plot of 35-year-old Norway spruce, established in 1970 by the Institute of Dendrology at K&oacute;rnik, where progenies of 22 plustrees from the Kłodzko Forest District were planted. The experiment was established in an incomplete block design of 20 families with 3 replications. Survival rate and growth traits determining productivity (plant height or basal area &ndash; stem cross-sectional area at breast height per 1&nbsp;ha) were assessed in several years, and qualitative traits (trunk straightness; degree of natural pruning; thickness, length and angle of branches; crown density; presence of galls caused by the aphids Adelges laricis Vall. and Sacchiphantes viridis Ratz.) were evaluated once in 2001. Analysis of variance revealed significant differences between the half-sib families in survival rate and productivity but no significant differences in qualitative traits. Statistically significant positive correlations were found between trunk straightness at the age of<br />&nbsp;36 years and height of 2-year-old seedlings in the nursery, and between the degree of natural pruning at the age of 36 years and both tree height at the age of 9 years and basal area at the age of 13 years.

scholarly journals On average, a professional rugby union player is more likely than not to sustain a concussion after 25 matches

2018 ◽  
Vol 53 (15) ◽  
pp. 969-973 ◽  
Author(s):  
James Rafferty ◽  
Craig Ranson ◽  
Giles Oatley ◽  
Mohamed Mostafa ◽  
Prabhat Mathema ◽  
...  
Keyword(s):  
Cohort Study ◽  
Lower Limb ◽  
Injury Risk ◽  
Rugby Union ◽  
Return To Play ◽  
Injury Rates ◽  
Risk Of Injury ◽  
Four Seasons ◽  
Concussive Injury ◽  
Over Time

ObjectivesTo investigate concussion injury rates, the likelihood of sustaining concussion relative to the number of rugby union matches and the risk of subsequent injury following concussion.MethodsA four-season (2012/2013–2015/2016) prospective cohort study of injuries in professional level (club and international) rugby union. Incidence (injuries/1000 player-match-hours), severity (days lost per injury) and number of professional matches conferring a large risk of concussion were determined. The risk of injury following concussion was assessed using a survival model.ResultsConcussion incidence increased from 7.9 (95% CI 5.1 to 11.7) to 21.5 injuries/1000 player-match-hours (95% CI 16.4 to 27.6) over the four seasons for combined club and international rugby union. Concussion severity was unchanged over time (median: 9 days). Players were at a greater risk of sustaining a concussion than not after an exposure of 25 matches (95% CI 19 to 32). Injury risk (any injury) was 38% greater (HR 1.38; 95% CI 1.21 to 1.56) following concussion than after a non-concussive injury. Injuries to the head and neck (HR 1.34; 95% CI 1.06 to 1.70), upper limb (HR 1.59; 95% CI 1.19 to 2.12), pelvic region (HR 2.07; 95% CI 1.18 to 3.65) and the lower limb (HR 1.60; 95% CI 1.21 to 2.10) were more likely following concussion than after a non-concussive injury.ConclusionConcussion incidence increased, while severity remained unchanged, during the 4 years of this study. Playing more than 25 matches in the 2015/2016 season meant that sustaining concussion was more likely than not sustaining concussion. The 38% greater injury risk after concussive injury (compared with non-concussive injury) suggests return to play protocols warrant investigation.

scholarly journals Behavioural difficulties in early childhood and risk of adolescent injury

2019 ◽  
Vol 105 (3) ◽  
pp. 282-287
Author(s):  
Amrita Bandyopadhyay ◽  
Karen Tingay ◽  
Ashley Akbari ◽  
Lucy Griffiths ◽  
Helen Bedford ◽  
...  
Keyword(s):  
Early Childhood ◽  
Negative Binomial ◽  
Negative Binomial Regression ◽  
Activity Level ◽  
Injury Incidence ◽  
Injury Rates ◽  
Risk Of Injury ◽  
Academic Qualification ◽  
Increased Risk ◽  
Receive Treatment

ObjectiveTo evaluate long-term associations between early childhood hyperactivity and conduct problems (CP), measured using Strengths and Difficulties Questionnaire (SDQ) and risk of injury in early adolescence.DesignData linkage between a longitudinal birth cohort and routinely collected electronic health records.SettingConsenting Millennium Cohort Study (MCS) participants residing in Wales and Scotland.Patients3119 children who participated in the age 5 MCS interview.Main outcome measuresChildren with parent-reported SDQ scores were linked with hospital admission and Accident & Emergency (A&E) department records for injuries between ages 9 and 14 years. Negative binomial regression models adjusting for number of people in the household, lone parent, residential area, household poverty, maternal age and academic qualification, child sex, physical activity level and country of interview were fitted in the models.Results46% of children attended A&E or were admitted to hospital for injury, and 11% had high/abnormal scores for hyperactivity and CP. High/abnormal or borderline hyperactivity were not significantly associated with risk of injury, incidence rate ratio (IRR) with 95% CI of the high/abnormal and borderline were 0.92 (95% CI 0.74 to 1.14) and 1.16 (95% CI 0.88 to 1.52), respectively. Children with borderline CP had higher injury rates compared with those without CP (IRR 1.31, 95% CI 1.09 to 1.57).ConclusionsChildren with high/abnormal hyperactivity or CP scores were not at increased risk of injury; however, those with borderline CP had higher injury rates. Further research is needed to understand if those with difficulties receive treatment and support, which may reduce the likelihood of injuries.

Negative impact of ozone on the stem basal area increment of mature Norway spruce in south Sweden

2006 ◽  
Vol 232 (1-3) ◽  
pp. 146-151 ◽  
Author(s):  
Per Erik Karlsson ◽  
Göran Örlander ◽  
Ola Langvall ◽  
Johan Uddling ◽  
Urban Hjorth ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Negative Impact ◽  
Basal Area ◽  
Basal Area Increment ◽  
South Sweden

scholarly journals Growth of advance regeneration of Norway spruce after clear-cutting

2005 ◽  
Vol 25 (7) ◽  
pp. 793-801 ◽  
Author(s):  
M. Metslaid ◽  
T. Ilisson ◽  
M. Vicente ◽  
E. Nikinmaa ◽  
K. Jogiste
Keyword(s):  
Norway Spruce ◽  
Clear Cutting ◽  
Advance Regeneration
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