Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 24
Book Description
Growth Classification Systems for Red Fir and White Fir in Northern California
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 24
Book Description
Growth Classification Systems for Red Fir and White Fir in Northern California
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 18
Book Description
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 18
Book Description
Risk-rating Systems for Mature Red Fir and White Fir in Northern California
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 36
Book Description
Ten-year Risk-rating Systems for California Red Fir and White Fir
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 20
Book Description
Ten-year Risk-rating Systems for California Red Fir and White Fir
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 18
Book Description
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 18
Book Description
Risk-rating Systems for Mature Red Fir and White Fir in Northern California
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 0
Book Description
On the basis of crown and bole characteristics, risk-rating systems to predict the probability that a tree will die within 5 years were developed for mature red fir and white fir in northern California. The systems apply to firs at least 10 inches (25.4 cm) in diameter-at-breast-height (d.b.h.), growing in mature stands, with the original overstory at least partially intact. From 1975 to 1977, 1012 red firs (851 live, 161 dead) and 2571 white firs (2430 live, 141 dead) were examined in virgin and cutover stands. Tree characteristics were selected and used as predictor variables in regression equations. The risk equations were then translated into Award-Penalty Point Systems for field use. A tree is awarded points on the basis of ratings of some characteristics, and penalized points on the basis of ratings of others. The difference between the Award and Penalty Point Totals-the Risk Point Total-is the value used to predict a tree's death within 5 years. This report describes studies designed to develop, test, and extend the risk-rating systems. Properly used, these systems should contribute to the sound, long-term management of California's true firs.
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 0
Book Description
On the basis of crown and bole characteristics, risk-rating systems to predict the probability that a tree will die within 5 years were developed for mature red fir and white fir in northern California. The systems apply to firs at least 10 inches (25.4 cm) in diameter-at-breast-height (d.b.h.), growing in mature stands, with the original overstory at least partially intact. From 1975 to 1977, 1012 red firs (851 live, 161 dead) and 2571 white firs (2430 live, 141 dead) were examined in virgin and cutover stands. Tree characteristics were selected and used as predictor variables in regression equations. The risk equations were then translated into Award-Penalty Point Systems for field use. A tree is awarded points on the basis of ratings of some characteristics, and penalized points on the basis of ratings of others. The difference between the Award and Penalty Point Totals-the Risk Point Total-is the value used to predict a tree's death within 5 years. This report describes studies designed to develop, test, and extend the risk-rating systems. Properly used, these systems should contribute to the sound, long-term management of California's true firs.
Ten-year Risk-rating Systems for California Red Fir and White Fir
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 177
Book Description
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 177
Book Description
Developing Risk-rating Systems for Mature Red Fir and White Fir in Northern California
Predicting Height Increment of Young-growth Red Fir in California and Southern Oregon
Author: K. Leroy Dolph
Publisher:
ISBN:
Category : Abies magnifica
Languages : en
Pages : 12
Book Description
Publisher:
ISBN:
Category : Abies magnifica
Languages : en
Pages : 12
Book Description
Using Indicator Plants to Assess Susceptibility of California Red Fir and White Fir to the Fir Engraver Beetle
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 6
Book Description
Using a Vegetation Drought Index (VDI) for estimating the susceptibility of California red and white firs to the fir engraver beetle (Scolytus ventralis) was evaluated in northern California forests where these true firs (Abies species) occur in mixed conifer and true fir stands. Midway through the summer drought, true fir moisture stress-a known predisposing factor-was highest on sites with highest VDI values (most xeric). In mixed conifer stands, the susceptibility of white firs-as indicated by the mean percentage of their basal area killed annually-was highest on sites with highest VDI values. But in true fir stands, the susceptibility of mixed red and white firs was highest on sites with the lowest VDI values. Regression models with VDI, stand basal area, and percentage of true fir as regressors lacked the required predictive range and precision, suggesting that VDI will likely have to be used in combination with predictors other than, or in addition to, those analyzed.
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 6
Book Description
Using a Vegetation Drought Index (VDI) for estimating the susceptibility of California red and white firs to the fir engraver beetle (Scolytus ventralis) was evaluated in northern California forests where these true firs (Abies species) occur in mixed conifer and true fir stands. Midway through the summer drought, true fir moisture stress-a known predisposing factor-was highest on sites with highest VDI values (most xeric). In mixed conifer stands, the susceptibility of white firs-as indicated by the mean percentage of their basal area killed annually-was highest on sites with highest VDI values. But in true fir stands, the susceptibility of mixed red and white firs was highest on sites with the lowest VDI values. Regression models with VDI, stand basal area, and percentage of true fir as regressors lacked the required predictive range and precision, suggesting that VDI will likely have to be used in combination with predictors other than, or in addition to, those analyzed.