Persistence of pine species in late-successional forests: evidence from habitat-related variation in stand age structure

2013 ◽  
Vol 25 (2) ◽  
pp. 584-600 ◽  
Author(s):  
Robert T. Fahey ◽  
Craig G. Lorimer
Keyword(s):  
Age Structure ◽  
Stand Age ◽  
Related Variation ◽  
Successional Forests ◽  
Pine Species

scholarly journals Influences of Forest Type, Stand Age, and Weather on Deer Weights and Antler Size in the Southern Appalachians

1997 ◽  
Vol 21 (1) ◽  
pp. 11-18 ◽  
Author(s):  
William M. Ford ◽  
A. Sydney Johnson ◽  
Philip E. Hale ◽  
James M. Wentworth
Keyword(s):  
Age Structure ◽  
Forest Type ◽  
Site Index ◽  
Forest Stand ◽  
Site Quality ◽  
Stand Age ◽  
Southern Appalachians ◽  
Study Region ◽  
Pinus Spp ◽  
Percent Area

Abstract We analyzed correlations of forest type, age structure, and site index data with weights and antler characteristics of yearling white-tailed deer (Odocoileus virginianus) bucks from specific localities in the Chattahoochee, Cherokee, Nantahala, and Pisgah national forests in Georgia, Tennessee, and North Carolina. Areas in the northern part of the study region produced larger deer with larger antlers than those in the southern portion of the region. These northern areas differed from those to the south in having more diverse ownership and land use and in origins of deer stock. Weights and antler characteristics were significantly correlated (P < 0.05) with percent area in the cove hardwood type, but otherwise were poorly correlated with forest stand type and site index. Percent area in young (0-8 yr old) cove hardwood and in mid-successional (9-20 and 21-40) cove hardwood, pine (Pinus spp.), and upland oak (Quercus spp.) were significantly correlated (P < 0.05) with deer variables, particularly in years following a poor mast crop. Much of the quantifiable habitat influences on deer in the Southern Appalachians probably is masked by low deer densities and the small site quality differences among areas examined. Because much of the forest consists of mature mast-producing oaks and abundant forage is produced in both mature and younger aged stands, deer numbers seem to be below any threshold of quantifiable effects due to forest stand age structure. South. J. Appl. For. 21(1):11-18.

scholarly journals Climate-Driven Change of the Stand Age Structure in the Polar Ural Mountains

10.5772/25044 ◽  
2011 ◽  
Author(s):  
Valeriy Mazepa ◽  
Stepan Shiyatov ◽  
Nadezhda Devi
Keyword(s):  
Age Structure ◽  
Stand Age ◽  
Ural Mountains ◽  
Polar Ural

Succession écologique des forêts d'épinette blanche et fluctuations climatiques, Poste-de-la-Baleine, Nouveau-Québec

1976 ◽  
Vol 54 (12) ◽  
pp. 1394-1402 ◽  
Author(s):  
Serge Payette
Keyword(s):  
Seed Production ◽  
Age Structure ◽  
Picea Glauca ◽  
Forest Regeneration ◽  
White Spruce ◽  
Stand Age ◽  
Structural Pattern ◽  
Climatic Fluctuations ◽  
Maritime Forest ◽  
Number Of Individuals

The stand structures of three white spruce (Picea glauca (Moench) Voss) climax forests of the hemiarctic zone in New Quebec are described. The forests have a similar structural pattern, characterized by important and irregular variations in the number of individuals per age, diameter, and height classes. These variations are synchronic and suggest that the climate strongly influences the forest regeneration. The discontinuous trend in the curves may possibly be related to changes in seed production and seedling establishment. Synchronism between the 300-year dendrochronological curve and the stand age-structure is apparent. The hollow parts of the age curves are related to unfavorable climatic periods and the peaks to favorable ones. These climatic fluctuations are probably responsible for either a decrease or an increase in white spruce seed production important to hemiarctic forest regeneration. Finally, the writer suggests a theoretical age-structure curve for climax forests in the maritime forest-tundra near Poste-de-la-Baleine, New Quebec.

Restoring a midtolerant pine species as a component of late-successional forests: Results of gap-based planting trials

2013 ◽  
Vol 292 ◽  
pp. 139-149 ◽  
Author(s):  
Robert T. Fahey ◽  
Craig G. Lorimer
Keyword(s):  
Successional Forests ◽  
Pine Species

The pattern of invasion and establishment of Piceamariana (Mill.) BSP. into the subcanopy layers of Pinusbanksiana Lamb. dominated stands

1982 ◽  
Vol 12 (4) ◽  
pp. 973-984 ◽  
Author(s):  
T. J. Carleton
Keyword(s):  
Age Structure ◽  
Forest Succession ◽  
Black Spruce ◽  
Seedling Survival ◽  
Stand Age ◽  
Fire Scar ◽  
Seed Supply ◽  
Long Time ◽  
Survival Experiment ◽  
Pattern Of Invasion

Stand age-structure analysis is used to determine whether establishment of Piceamariana (Mill.) BSP. in the subcanopy of Pinusbanksiana Lamb. dominated stands takes the form of a gradual influx or a sudden event. Twenty-six P. banksiana dominated stands were investigated of which 15 contained P. mariana trees at moderate to high densities. Postfire ages ranged from 46 years to 132 years for the oldest P. banksiana cohort in each stand. The 26 stands were subjectively assigned to one of seven groups on the criterion of age-structure histogram appearance. A multivariate test of the hypothesis that such age-structure differences could be due to soil differences was not significant. Three patterns of P. mariana influx were indicated, (i) Gradual influx over a long time span in the oldest stands. (ii) Contemporaneous postfire reestablishment of both P. banksiana and P. mariana on a site. (iii) Invasion of P. mariana cohorts following surface fire activity as evidenced by fire scar dates. Results from a P. mariana seedling survival experiment indicated that depth of burn is of critical importance for black spruce seedling establishment in these stands. However, circumstantial evidence suggests that P. mariana seed supply may also be limiting to establishment success. These observations are discussed briefly in relation to models of forest succession.

scholarly journals Gillnet catchability of brown trout Salmo trutta is highly dependent on fish size and capture site

2019 ◽  
Vol 39 ◽  
pp. 30-38
Author(s):  
Reidar Borgstrøm ◽  
Knut Bergum ◽  
Trond Erik Børresen ◽  
Martin A. Svenning
Keyword(s):  
Brown Trout ◽  
Age Structure ◽  
Salmo Trutta ◽  
Habitat Type ◽  
Sampling Bias ◽  
Fish Populations ◽  
Fish Size ◽  
Small Lake ◽  
Related Variation ◽  
Brown Trout Salmo Trutta

Use of experimental gillnet fleets is common both in scientific studies of fish populations and in fishsampling for management purposes. Fish catchability may vary considerably with fish and gillnet meshsize, and catches obtained by gillnet fleets composed of nets with different mesh sizes may give lengthand age distributions that deviate considerably from the length and age structure of the population.We have estimated the absolute catchability of allopatric brown trout (Salmo trutta) in the littoral andpelagic habitat of a small lake based on a mark-recapture experiment. The brown trout catchabilityvaried considerably both with fish size and habitat type, probably due to a size-related variation inswimming distance per time unit and a size-related use of the different lentic habitats. The samplingbias in experimental gillnet fishing may be reduced by operating the gillnet fleets in all possible lentichabitats and most fundamentally, by use of catchability data obtained from populations with ‘known’length and age structures. By reducing this sampling bias, more realistic estimations of the age andlength distribution for a given population will be possible.

Methods of detecting past spruce beetle outbreaks in Rocky Mountain subalpine forests

1991 ◽  
Vol 21 (2) ◽  
pp. 242-254 ◽  
Author(s):  
Thomas T. Veblen ◽  
Keith S. Hadley ◽  
Marion S. Reid ◽  
Alan J. Rebertus
Keyword(s):  
Age Structure ◽  
Ring Width ◽  
Rocky Mountain ◽  
Stand Age ◽  
Horizontal Line ◽  
Sample Sizes ◽  
Subalpine Forests ◽  
Individual Tree ◽  
Spruce Beetle ◽  
History Of

We examined the use of dendrochronological techniques and stand age structure for detecting past outbreaks of spruce beetle (Dendroctonusrufipennis Kirby) in subalpine forests in the Colorado Rocky Mountains. The methods were based on the observation that following beetle-caused mortality of canopy trees, growth rates of subcanopy Engelmann spruce (Piceaengelmannii (Parry) Engelm.) and subalpine fir (Abieslasiocarpa (Hook.) Nutt.) increase severalfold and remain high for several decades or more. Although inspection of unstandardized individual tree ring-width chronologies is useful for detecting past disturbance, standardized mean chronologies based on ≥20 cores assure adequate sample sizes and improve interpretability. Standardization of ring-width series by fitting the observed data to a horizontal line passing through the mean ring width facilitates detection of past outbreaks better than other standardization models such as polynomial or cubic spline functions. The incorporation of samples from dead-standing trees increases sample sizes and reveals patterns in the early history of a stand that may not be detectable if samples only from live trees are used. Patterns of release frequencies based on nearly all the trees in a stand were helpful in confirming interpretations not always clear from the chronologies alone. Variations in tree population age structures were related to the history of disturbance by beetle outbreak, but age structure alone was not a reliable means of detecting past outbreaks.

Red Heart Disease in Pines Caused by Porodaedalea (Phellinus) pini in Florida

EDIS ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 3
Author(s):  
Yin-Tse Huang ◽  
Jeffrey Eickwort ◽  
Jiri Hulcr
Keyword(s):  
Heart Disease ◽  
Forest Resources ◽  
Fact Sheet ◽  
Cavity Nesting ◽  
Pine Species

All pine species in Florida are susceptible to red heart disease. The disease can decrease timber value and weaken trees, making them threats to people and property. In forests, however, the same disease can be beneficial to cavity-nesting animals like red-cockaded woodpeckers. This 3-page fact sheet written by Yin-Tse Huang, Jeffrey Eickwort, and Jiri Hulcr and published by the UF/IFAS School of Forest Resources and Conservation describes the disease and provides some tips to manage it in areas where it could cause problems for people.http://edis.ifas.ufl.edu/fr425

Sign in / Sign up

Export Citation Format

Share Document