Author: |
Bradley, Timothy Scott |
| Year: | (1999) |
| Title: | Prescription fire in western ecosystems: Microsite recovery of vegetation in a pinyon juniper woodland and bark beetle response to fire-injured trees in the Lake Tahoe Basin (Nevada, California, Dendroctonus, Scolytidae). |
| Institution: | University of Nevada Reno |
| No. Pages: | 87 |
| Thesis Type: | MS |
| Link: | Download (UNR Only) |
| Keywords: | ENVIRONMENTAL SCIENCES (0768); AGRICULTURE, FORESTRY AND WILDLIFE (0478); AGRICULTURE, RANGE MANAGEMENT (0777); BIOLOGY, ENTOMOLOGY (0353); BIOLOGY, ECOLOGY (0329) |
| Abstract: | Investigations were conducted on prescription fire effects of vegetation microsite recovery in a pinyon- juniper woodland and on bark beetle presence in fire- injured Jeffrey pines in the Lake Tahoe Basin. Analysis of variance showed significant short-term decreases in cover of perennial grasses and a general decrease in densities of all non-grass plant species. Fire effects led to highly significant microsite recovery pattern for cheatgrass. Three different plant species, absent from non-burned plots, showed significant increases in burned plots. An assessment of control and fire injured Jeffrey pines showed a significant correlation between burning and probability of bark beetle attacks. Computed odds ratio from a logistic regression model showed the probability of bark beetle attack was 24 times greater in fire plot trees. Highly significant multiple logistic regression models were developed for commonly occurring bark beetle species, showing a high positive correlation with various burn severity measures. Note: dissertation citations and abstracts contained here are published with permission of ProQuest Information and Learning. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by addressing your request to UMI® Dissertation Services, 300 North Zeeb Road, Ann Arbor, MI 48106-1346 USA. Telephone (734) 761-7400; Web-page: wwwlib.umi.com/dissertations. |
| Advisor: | Tueller, Paul T. |
| Reference: | 0-599-35465-8; MAI 37/05, p. 1422, Oct 1999
|
Author: |
Caldwell, Todd Gregory |
| Year: | (1999) |
| Title: | Nutrient dynamics following prescription fire in Tahoe Basin forest soils (Nevada, California). |
| Institution: | University of Nevada Reno |
| No. Pages: | 69 |
| Thesis Type: | MS |
| Link: | Download (UNR Only) |
| Keywords: | HYDROLOGY (0388); AGRICULTURE, SOIL SCIENCE (0481); BIOGEOCHEMISTRY (0425); AGRICULTURE, FORESTRY AND WILDLIFE (0478) |
| Abstract: | The effect of fire on Tahoe Basin forest soils was studied to assess the potential nutrient export from the terrestrial ecosystem via volatilization and leaching. Two field-based methods were applied to measure the amount of C and N volatilized during three prescription fires. The weight method was based on pre/post-burn forest floor measurements. The ratio method was based on the residual calcium content of the forest floor and pre- burn Ca:element regressions. Results from both methods indicate that losses ranged from 6–24 Mg C ha−1 (49–77%). Nitrogen losses ranged from 61–542 kg N ha−1 (24–55%). Both methods provided reasonable estimates, although the ratio method regressions were better correlated. Post-fire soil chemistry showed elevated pH, Ca2+, and SO 42−. Ash-derived calcium controlled post-burn soil pH. O-PO4 and pH exhibited a strong inverse linear correlation. An exponential relationship existed between pH and SO42− , resulting in high desorption or dissolution as pH increased. Results were similar on parent materials of both decomposed granite and andesite. Note: dissertation citations and abstracts contained here are published with permission of ProQuest Information and Learning. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by addressing your request to UMI® Dissertation Services, 300 North Zeeb Road, Ann Arbor, MI 48106-1346 USA. Telephone (734) 761-7400; Web-page: wwwlib.umi.com/dissertations. |
| Advisor: | Johnson, Dale W. |
| Reference: | 0-599-64868-6; MAI 38/04, p. 960, Aug 2000
|
Author: |
Mandeno, Petronila Esther |
| Year: | (2000) |
| Title: | Prescribed fire effects in mixed conifer stands in the Lake Tahoe Basin (California). |
| Institution: | University of Nevada Reno |
| No. Pages: | 60 |
| Thesis Type: | MS |
| Link: | Download (UNR Only) |
| Keywords: | ENVIRONMENTAL SCIENCES (0768); AGRICULTURE, FORESTRY AND WILDLIFE (0478) |
| Abstract: | Three years of fire effects monitoring data are analyzed to evaluate changes in forest fuel loading and vegetation characteristics on California State Park lands within the Lake Tahoe Basin. California State Parks implemented a monitoring protocol developed by the National Park Service to track vegetation changes following their prescribed fire program. This preliminary analysis of that monitoring data found that little change has occurred in herbaceous relative cover and overall overstory tree (dbh > 15.0 cm) composition, basal area and density. Whereas, significant changes occurred with fuel loading, shrub density, and pole-sized tree (dbh <= 15.0 cm) density. These results will be used to assess the achievements of the California State Parks management objectives and to determine the overall trend of these vegetation changes. Note: dissertation citations and abstracts contained here are published with permission of ProQuest Information and Learning. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by addressing your request to UMI® Dissertation Services, 300 North Zeeb Road, Ann Arbor, MI 48106-1346 USA. Telephone (734) 761-7400; Web-page: wwwlib.umi.com/dissertations. |
| Advisor: | Tueller, Paul T. |
| Reference: | 0-599-77292-1; MAI 38/06, p. 1567, Dec 2000
|
