A 400-year history of fire and oak recruitment in an old-growth oak forest in western Maryland, U.S.A.

2001 ◽  
Vol 31 (8) ◽  
pp. 1437-1443 ◽  
Author(s):  
Durland L Shumway ◽  
Marc D Abrams ◽  
Charles M Ruffner
Keyword(s):  
Cross Sections ◽  
Fire History ◽  
18Th Century ◽  
Fire Suppression ◽  
Acer Rubrum ◽  
Old Growth ◽  
European Settlement ◽  
Old Growth Forest ◽  
Before And After ◽  
Old Trees

We document the fire history and associated ecological changes of an old-growth forest stand in western Maryland, U.S.A. The study area is located on the side slopes of a ridge system (Savage Mountain). Twenty basal cross sections were obtained from old trees cut in 1986, which provided evidence of 42 fires from 1615 to 1958. Nine fires were recorded in the sample trees in the 17th century, 13 in the 18th century, 12 in the 19th century, and eight in the early to mid-20th century. However, there were no major fire years after 1930. The Weibull modal fire interval was 7.6 years. Oaks recruited consistently from the early 1600s to the early 1900s, but there was increased Acer rubrum L. and Betula lenta L. recruitment with fire suppression after 1930. Species recruitment patterns and long-term fire history reported in this study offer important direct support for the hypothesis that periodic fire played an important role in the historical development and perpetuation of oak forests of the mid-Atlantic region before and after European settlement.

Declining fires in Larix-dominated forests in northern Irkutsk district

2011 ◽  
Vol 20 (2) ◽  
pp. 248 ◽  
Author(s):  
Tuomo Wallenius ◽  
Markku Larjavaara ◽  
Juha Heikkinen ◽  
Olga Shibistova
Keyword(s):  
20Th Century ◽  
Forest Fires ◽  
Fire History ◽  
18Th Century ◽  
Fire Suppression ◽  
Tree Ring Chronology ◽  
Fire Cycle ◽  
History Of ◽  
Historical Accounts ◽  
Additional Explanation

To study the poorly known fire history of Larix-dominated forest in central Siberia, we collected samples from 200 trees in 46 systematically located study plots. Our study area stretches ~90 km from north to south along the River Nizhnyaya Tunguska in northern Irkustk district. Cross-dated tree-ring chronology for all samples combined extended from the year 1360 AD to the present and included 76 fire years and 88 separate fire events. Average fire cycle gradually lengthened from 52 years in the 18th century to 164 years in the 20th century. During the same time, the number of recorded fires decreased even more steeply, i.e. by more than 85%. Fires were more numerous but smaller in the past. Contrary to expectations, climate change in the 20th century has not resulted in increased forest fires in this region. Fire suppression may have contributed to the scarcity of fires since the 1950s. However, a significant decline in fires was evident earlier; therefore an additional explanation is required, a reduction in human-caused ignitions being likely in the light of historical accounts.

The extent of old-growth Thuja occidentalis on cliffs of the Niagara Escarpment

1991 ◽  
Vol 69 (7) ◽  
pp. 1628-1636 ◽  
Author(s):  
D. W. Larson ◽  
P. E. Kelly
Keyword(s):  
Cross Sections ◽  
Forest Ecosystems ◽  
Forest Ecology ◽  
Eastern North America ◽  
Old Growth ◽  
Southern Ontario ◽  
Thuja Occidentalis ◽  
Selective Sampling ◽  
Niagara Escarpment ◽  
Old Growth Forest

Extensive random sampling of populations of Thuja occidentalis growing on vertical cliffs of the Niagara Escarpment in southern Ontario, Canada, was conducted to determine the extent of an old-growth forest that had recently been described. Nine sites distributed along the length of the escarpment were intensively sampled and from these, 1254 increment cores or cross sections were obtained from 872 trees in all age categories. The results show that all cliffs support a broadly similar old-growth forest of stunted trees, but that statistically significant differences were found in the numbers of trees among sites. No large differences among sites were found in heights or diameters of trees. Maximum ages of 532 (sampled) and 814 years (estimated) were found in the random census, although in subsequent selective sampling, intact stems up to 1032 years were found. The incidence of fire and cutting by humans was also measured, but little evidence of such disturbances was found. It is concluded that exposed cliff faces of the Niagara Escarpment support one of the oldest, most extensive, and most intact old-growth forest ecosystems yet described for eastern North America. The opportunities for the study of basic forest ecology and especially for dendrochronology are considerable. Key words: Thuja occidentalis, old growth, Niagara Escarpment, cliff, age structures.

The influences of drought and humans on the fire regimes of northern Pennsylvania, USA

2013 ◽  
Vol 43 (8) ◽  
pp. 757-767 ◽  
Author(s):  
Patrick H. Brose ◽  
Daniel C. Dey ◽  
Richard P. Guyette ◽  
Joseph M. Marschall ◽  
Michael C. Stambaugh
Keyword(s):  
American Indians ◽  
Cross Sections ◽  
Prescribed Fire ◽  
Fire History ◽  
Fire Regime ◽  
Fire Regimes ◽  
European Settlement ◽  
Pine Regeneration ◽  
Fire Exclusion ◽  
Dormant Season

Understanding past fire regimes is necessary to justify and implement restoration of disturbance-associated forests via prescribed fire programs. In eastern North America, the characteristics of many presettlement fire regimes are unclear because of the passage of time. To help clarify this situation, we developed a 435-year fire history for the former conifer forests of northern Pennsylvania. Ninety-three cross sections of fire-scarred red pines (Pinus resinosa Aiton) collected from three sites were analyzed to determine common fire regime characteristics. Prior to European settlement, fires occurred every 35–50 years and were often large dormant-season burns that sometimes initiated red pine regeneration. American Indians probably ignited these fires. Fire occurrence had a weak association with multiyear droughts. After European settlement started around 1800, fires occurred every 5–7 years due to widespread logging. Fire size and seasonality expanded to include small growing-season fires. The weak drought–fire association ceased. In the early 1900s, logging ended and wildfire control began. Since then, fires have been nearly absent from the sites despite several multiyear droughts in the 20th century. The human influences of cultural burning, logging, and fire exclusion are more important than the influence of drought to the fire regimes of northern Pennsylvania.

Old-growth forest landscape transitions from pre-European settlement to present

1994 ◽  
Vol 9 (3) ◽  
pp. 191-205 ◽  
Author(s):  
Mark A. White ◽  
David J. Mladenoff
Keyword(s):  
Forest Landscape ◽  
Old Growth ◽  
European Settlement ◽  
Old Growth Forest

Fire frequency for the transitional mixedwood forest of Timiskaming, Quebec, Canada

2005 ◽  
Vol 35 (3) ◽  
pp. 656-666 ◽  
Author(s):  
Daniel J Grenier ◽  
Yves Bergeron ◽  
Daniel Kneeshaw ◽  
Sylvie Gauthier
Keyword(s):  
Fire History ◽  
Fire Suppression ◽  
Sampling Strategy ◽  
Fire Frequency ◽  
Management Approach ◽  
Land Use Patterns ◽  
Temporal Shift ◽  
Fire Cycle ◽  
Old Growth Forest ◽  
Time Required

Fire history was reconstructed for a 2500-km2 area at the interface between the boreal coniferous and northern hardwood forests of southwestern Quebec. The fire cycle, the time required for an area equal to the study site to burn once over, was described using a random sampling strategy that included dendrochronological techniques in conjunction with provincial and national government archival data. Physiographic elements were not found to spatially influence fire frequency; however, human land-use patterns were observed to significantly affect the fire frequency. A temporal shift in fire frequency was also detected, which coincided with the period of Euro-Canadian colonization and known extreme dry years for the study site. Additionally, a fire-free period was identified in the most recent times that could be associated with fire suppression and climate change. The estimated cycles (approx. 188–314 years) for the southeastern section of the study area were thought to better represent the natural cycles for this transition zone as a result of less anthropogenic influence. The importance of gap-type dynamics becomes evident with the increased presence of old-growth forest, given the derived fire cycle estimations for the region. Even-aged management with short rotations, consequently, is questioned because fire cycle estimations suggest more complex harvest systems using an ecosystem management approach.

scholarly journals The importance of managing and conserving large old trees: a case study from Victorian Mountain Ash forests

2016 ◽  
Vol 128 (1) ◽  
pp. 64 ◽  
Author(s):  
David Lindenmayer
Keyword(s):  
Key Management ◽  
Management Strategies ◽  
Population Recovery ◽  
Old Growth ◽  
Old Growth Forest ◽  
Eastern Australia ◽  
Mountain Ash ◽  
Old Trees ◽  
Regrowth Forest

Large old trees are critical structures in the Mountain Ash forests of the Central Highlands of Victoria. They perform many critical ecological and other roles. Populations of these trees are also in serious decline. A range of key management strategies is needed to arrest the decline of existing populations of large old trees and instigate population recovery. In particular all existing large old trees need to be properly protected with adequate buffers of uncut forest. In addition, all stands of old-growth forest, irrespective of their size, need to be protected to ensure they are not logged. The size of the old-growth estate also must be expanded so that it encompasses at least 30%‒50% of the distribution of Mountain Ash. Finally, the recruitment of new cohorts of large old trees is critically important to replace existing trees when they are lost. To achieve this, large areas of existing regrowth forest that regenerated after the 1939 fires need to be excluded from logging and grown through to an old-growth stage. Implementation of altered management in Mountain Ash forests is urgent, as delays in policies will exacerbate the decline of this significant population of large old trees in south-eastern Australia.

scholarly journals Linking old-growth forest composition, structure, fire history, climate and land-use in the mountains of northern México

Ecosphere ◽  
2012 ◽  
Vol 3 (11) ◽  
pp. art106 ◽  
Author(s):  
Citlali Cortés Montaño ◽  
Peter Z. Fulé ◽  
Donald A. Falk ◽  
José Villanueva-Díaz ◽  
Larissa L. Yocom
Keyword(s):  
Land Use ◽  
Fire History ◽  
Forest Composition ◽  
Old Growth ◽  
Northern Mexico ◽  
Old Growth Forest ◽  
Composition Structure

Old-growth forest: An ancient and stable sylvan equilibrium, or a relatively transitory ecosystem condition that offers people a visual and emotional feast? Answer—it depends

2003 ◽  
Vol 79 (3) ◽  
pp. 429-440 ◽  
Author(s):  
J P (Hamish) Kimmins
Keyword(s):  
Industrial Revolution ◽  
Stages Of Development ◽  
Old Growth ◽  
Balance Of Nature ◽  
Knowledge Based ◽  
Old Growth Forest ◽  
Large Trees ◽  
Ecosystem Condition ◽  
Social Scientific ◽  
Old Trees

As a species, humans depend heavily on their visual sense, make decisions as much from their hearts as from their heads (emotion-and value-based decisions versus analytical, logic- and knowledge-based decisions), and dislike environmental and other change. Societies in early stages of development have generally revered old people for their wisdom and experience, whereas many societies at more advanced stages of development have adopted a culture of youth. Attitudes toward forests have shown a similar trend. Respect for large and old trees was a feature of some early societies, whereas societies in and after the industrial revolution became more interested in younger, faster growing trees for technical and utilitarian reasons. However, as human population growth caused the area of unmanaged forest, old forest, and forests of large trees to decline, reverence has revived for large, old trees and for old forests. This trend has not been matched by a renewed respect for scientific knowledge about forests and for wisdom about forests based on long experience. Reflecting the pervasive effects of the culture of youth, issues in forestry, including the issue of old forests, are being judged largely on an aesthetic basis, on human emotional response to snapshot visual aspects, and on a dislike for change—the Peter Pan syndrome. "Old-growth" forest, whatever it is, has been deified as a symbol of the mythical "balance of nature," a concept discredited by ecologists as a Victorian anachronism. There are important spiritual, aesthetic, wildlife, and environmental values associated with old forests, and the area of such forests is declining. There are many valid reasons (social, scientific, and environmental) for sustaining significant and representative areas of such forests. However, conservation of such forests and ensuring a future supply of the values they provide will not be achieved unless the reverential respect for such forests is matched by another meaning of respect: understanding such forests and basing our relationship with them on that understanding. This paper challenges forest managers and forest scientists to gain a significant understanding of "old growth" to provide a logical, knowledge-based, and experience-based foundation for the identification, inventory, conservation, and management of this forest ecosystem condition, and to assert this understanding as a counterbalance to the necessary, but insufficient, value-based attitude toward old forests that arises largely from visual snapshots and the emotions they arouse. Key words: old growth, biodiversity, sustainability, stability, succession, stand dynamics, respect for nature

scholarly journals Occurrence of Psocoptera in boreal old-growth forests

2007 ◽  
Vol 18 (3) ◽  
Author(s):  
Jussi Kanervo ◽  
Gergely Várkonyi
Keyword(s):  
19Th Century ◽  
Host Tree ◽  
Distribution Data ◽  
Forest Biodiversity ◽  
Old Growth ◽  
Old Growth Forest ◽  
Old Growth Forests ◽  
Old Trees ◽  
The 19Th Century ◽  
New Distribution

We aim to assess habitat and host-tree preferences of psocids (Insecta: Psocoptera) sampled in old-growth-forest biodiversity studies conducted during 1997–2003 in central and southern Finland. Thirty-one out of the recognized sixty-nine Finnish species were found in the samples, four of which (Elipsocus abdominalis, Reuterella helvimacula, Stenopsocus lachlani and Trichadenotecnum majus) might be associated with old-growth forests or with old trees. Psocidus flavonimbatus, a rare taiga species only previously known from the 19th century holotype from Estonia, was repeatedly collected in Kuhmo region, eastern Central Finland. This species is possibly associated with boreal spruce-dominated old-growth forests and likely to prefer Norway spruce as a host tree. We also provide new distribution data for several species and discuss their host-tree preferences.

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