scholarly journals Sudden Oak Death-Induced Tanoak Mortality in Coast Redwood Forests: Current and Predicted Impacts to Stand Structure

Forests ◽  
2010 ◽  
Vol 1 (3) ◽  
pp. 114-130 ◽  
Author(s):  
Benjamin S. Ramage ◽  
Kevin L. O’Hara
Keyword(s):  
Stand Structure ◽  
Sudden Oak Death ◽  
Coast Redwood ◽  
Redwood Forests

Forest transformation resulting from an exotic pathogen: regeneration and tanoak mortality in coast redwood stands affected by sudden oak death

2011 ◽  
Vol 41 (4) ◽  
pp. 763-772 ◽  
Author(s):  
Benjamin S. Ramage ◽  
Kevin L. O’Hara ◽  
Alison B. Forrestel
Keyword(s):  
Canopy Cover ◽  
Phytophthora Ramorum ◽  
Sudden Oak Death ◽  
Coast Redwood ◽  
Marin County ◽  
Wildlife Species ◽  
Management Interventions ◽  
Redwood Forests ◽  
Exotic Pathogen ◽  
Notholithocarpus Densiflorus

Sudden oak death is dramatically altering forests throughout coastal California, but little is known about the communities that are assembling in affected areas. This emerging disease, caused by the exotic pathogen Phytophthora ramorum (S. Werres, A.W.A.M. de Cock), has had especially severe effects on tanoak ( Notholithocarpus densiflorus (Hook. & Arn.) Manos, Cannon & S.H. Oh), a broadleaf evergreen that is abundant in forests dominated by coast redwood ( Sequoia sempervirens (D.Don) Endl.). Tanoak, a valuable food source to numerous wildlife species, is unlikely to successfully regenerate in diseased areas, and thus, affected redwood forests are transitioning to a novel state. In this study, to predict which species might replace tanoak, we investigated regeneration patterns in heavily impacted stands in Marin County, California. Our main findings were as follows: (i) despite reductions in canopy cover, there is no evidence that any species other than tanoak has exhibited a regenerative response to tanoak mortality, (ii) the regeneration stratum was dominated by redwood and tanoak (other tree species were patchy and (or) scarce), and (iii) some severely affected areas lacked sufficient regeneration to fully re-occupy available growing space. Our results indicate that redwood is likely to initially re-occupy the majority of the ground relinquished by tanoak, but also provide evidence that longer-term trajectories are unresolved, and may be highly responsive to management interventions.

Proceedings of the coast redwood forests in a changing California: A symposium for scientists and managers

2012 ◽  
Author(s):  
Richard B. Standiford ◽  
Theodore J. Weller ◽  
Douglas D. Piirto ◽  
John D Stuart
Keyword(s):  
Coast Redwood ◽  
Redwood Forests

Conservation of the California Coast Redwood and its Environment

1975 ◽  
Vol 2 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Ian G. Simmons ◽  
Thomas R. Vale
Keyword(s):  
Climatic Factors ◽  
Coast Redwood ◽  
Degradation Rates ◽  
Large Trees ◽  
Living Species ◽  
Redwood Forests ◽  
Human Use ◽  
Climatic Range ◽  
North Western ◽  
Southern Extremity

The genus Sequoia has existed since Mesozoic times, and early Tertiary Redwoods occurred practically throughout the northern hemisphere. Today, the Coast Redwood (Sequoia sempervirens) is the only living species of the genus, and it is restricted to the coastal environments of California and the southern extremity of Oregon. Climatic factors determine the outer limits of Redwood distribution, while edaphic, biotic, and hydrologic, variables influence the occurrence of Redwood within the climatic range.Human use of Redwood forests has altered the environmental conditions under which the Sequoia now grows. Logging has exposed the forest floor to increased light and higher temperatures, while in some places it has exposed the soil to accelerated erosion. Recent floods in the major watersheds of north-western California have been particularly disastrous in undercutting large trees along the river banks. Increased degradation rates on upper slopes have resulted in delivery of coarse sediments to floodplains, with possibly deleterious effects on living old-growth Redwoods.

Presettlement and modern disturbance regimes in coast redwood forests: Implications for the conservation of old-growth stands

2009 ◽  
Vol 258 (7) ◽  
pp. 1038-1054 ◽  
Author(s):  
Craig G. Lorimer ◽  
Daniel J. Porter ◽  
Mary Ann Madej ◽  
John D. Stuart ◽  
Stephen D. Veirs ◽  
...  
Keyword(s):  
Old Growth ◽  
Coast Redwood ◽  
Disturbance Regimes ◽  
Redwood Forests

scholarly journals Simulating Multiaged Coast Redwood Stand Development: Interactions between Regeneration, Structure, and Productivity

2009 ◽  
Vol 24 (1) ◽  
pp. 24-32 ◽  
Author(s):  
John-Pascal Berrill ◽  
Kevin L. O'Hara
Keyword(s):  
Stand Structure ◽  
Basal Area ◽  
Stand Density ◽  
Site Index ◽  
Growth And Yield ◽  
Stand Development ◽  
Area Index ◽  
Coast Redwood ◽  
Stand Growth ◽  
Upper Limit

Abstract Multiaged management regimes and harvesting scenarios were simulated in coast redwood (Sequoia sempervirens [D. Don.] Endl.) stands using models of stand growth and yield (CRYPTOS) and stocking assessment (redwood MASAM). Various stocking and age-class combinations were modeled on site index 100 and 130 ft (50 years). Results demonstrated how the number of cohorts, upper limit of stocking, and cohort densities affected growth and yield. Board foot volume increment reached a plateau in stands with a prescribed upper limit of stocking above leaf area index 7.2 to 8.6. Productivity did not differ between stands with two to five cohorts producing the same tree size at harvest. It was affected by stand structure when a cutting cycle of 20 years was prescribed in stands with three to five cohorts. Stands with the same density returned to the upper limit of stocking much sooner on better sites. Prolonging the cutting cycle by reducing stand density resulted in larger tree sizes at harvest and greater productivity. The growth of trees remaining after cutting 10–50% of stand basal area and growth of new stump sprouts were also simulated. Stands quickly returned to preharvest stocking after light cutting, implying that heavy or frequent light cutting is needed to sustain growth and vigor of regeneration in multiaged coast redwood stands.

scholarly journals The role of fire in the competitive dynamics of coast redwood forests

Ecosphere ◽  
2010 ◽  
Vol 1 (6) ◽  
pp. art20 ◽  
Author(s):  
B. S. Ramage ◽  
K. L. O'Hara ◽  
B. T. Caldwell
Keyword(s):  
Competitive Dynamics ◽  
Coast Redwood ◽  
Redwood Forests
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