Fire history and moisture influences on historical forest age structure in the sky islands of southern Arizona, USA

2015 ◽  
Vol 43 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Jose M. Iniguez ◽  
Thomas W. Swetnam ◽  
Christopher H. Baisan
Keyword(s):  
Age Structure ◽  
Fire History ◽  
Sky Islands ◽  
Forest Age ◽  
Forest Age Structure ◽  
Historical Forest

scholarly journals Emulating boreal forest disturbance dynamics: Can we maintain timber supply, aboriginal land use, and woodland caribou habitat?

2013 ◽  
Vol 89 (01) ◽  
pp. 54-65 ◽  
Author(s):  
Narayan Dhital ◽  
Frédéric Raulier ◽  
Hugo Asselin ◽  
Louis Imbeau ◽  
Osvaldo Valeria ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Age Structure ◽  
Aboriginal People ◽  
Natural Disturbance ◽  
Forest Age ◽  
Woodland Caribou ◽  
Timber Supply ◽  
Policy Issues ◽  
Potential Interest ◽  
Forest Age Structure

The effects on timber supply incurred by implementing an ecosystem-based management strategy were evaluated in an eastern Canadian boreal forest management unit. Standard linear programming was used to test the effects of four key policy issues: (1) aim for a targeted forest age structure inspired by natural fire regime and forest dynamics (multi-cohort approach), (2) agglomerate harvest blocks in operating areas to reproduce natural disturbance patterns at the landscape scale, (3) maintain cumulated clearcutting and natural disturbance rates inside the historical range of variability, and (4) exclude from harvest areas of potential interest to aboriginal people. The targeted forest age structure was achieved with a minimum reduction of periodic timber supply, but only after 50 years. Compared to a “business-as-usual” scenario, inclusion of the first three policy issues resulted in a 3% to 11% reduction in planned timber supply and a restoration period requiring that 43% to 67% of the productive area be excluded from clearcutting activities for the next 50 years. Such results require that partial cutting not be confined to operating areas eligible for clearcutting. Further exclusion of forest areas of potential interest to aboriginal people resulted in an additional 4% to 10% decrease in planned timber supply. Validation of the coarse filters used in this study (first three policy issues) was done using habitat requirements of woodland caribou (Rangifer tarandus caribou). Almost all scenarios induced a disturbance rate likely to allow a self-sustaining woodland caribou population within 25 years.

Fire history and age structure in red fir forests of Sequoia National Park, California

1987 ◽  
Vol 17 (7) ◽  
pp. 582-587 ◽  
Author(s):  
Donald C. Pitcher
Keyword(s):  
Age Structure ◽  
National Park ◽  
Fire History ◽  
Fire Behavior ◽  
White Pine ◽  
Sequoia National Park ◽  
Fire Scar ◽  
Forest Age Structure ◽  
Negative Exponential ◽  
In Fire

The relationship between historical fires and age structure was examined on three plots in red fir (Abiesmagnifica var. shastensis Lemm.) forests within Sequoia National Park, California, U.S.A. All trees greater than 0.1 m in height were mapped and aged. Fire history was determined from 16 fire-scar sections. Red fir trees are more shade tolerant, longer lived, larger, and slower growing than western white pine (Pinusmonticola Dougl.) on the plots. No fires have occurred since 1886, but prior to that time the average fire-free interval was 65 years. Most of the trees on two of the plots originated after fires, but on the third plot red fir regeneration was delayed for at least 60 years following the last fire. Structural differences between the plots were linked to variations in fire behavior. The decrease in fire frequencies in this century may have led to a decrease in red fir establishment. Excluding the most recent period, the forest age structure is in something of a steady state that approximates a negative exponential age-class distribution.

Dominance of a Rhizopogon sister species corresponds to forest age structure

Mycorrhiza ◽  
2015 ◽  
Vol 26 (2) ◽  
pp. 169-175 ◽  
Author(s):  
Carrie H. Van Dorp ◽  
Kevin J. Beiler ◽  
Daniel M. Durall
Keyword(s):  
Age Structure ◽  
Sister Species ◽  
Forest Age ◽  
Forest Age Structure

scholarly journals The Effects of Spatial Legacies following Shifting Management Practices and Fire on Boreal Forest Age Structure

Ecosystems ◽  
2007 ◽  
Vol 10 (8) ◽  
pp. 1261-1277 ◽  
Author(s):  
Patrick M. A. James ◽  
Marie-Josée Fortin ◽  
Andrew Fall ◽  
Dan Kneeshaw ◽  
Christian Messier
Keyword(s):  
Boreal Forest ◽  
Age Structure ◽  
Management Practices ◽  
Forest Age ◽  
Forest Age Structure
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