Knowledge Resource Center for Ecological Environment in Arid Area
| Semi-arid Grasslands Vegetative Community Response to Prescribed Broadcast Burns and Juniper Thinning and Pile Burning in Central Arizona | |
| [null] | |
| 出版年 | 2014 |
| 学位授予单位 | Sitzmann, Paul Roman (Author), Miller, William (Advisor), Alford, Eddie (Committee member), Green, Douglas (Committee member), Arizona State University (Publisher) |
| 英文摘要 | abstract: Grassland habitat restoration activities are occurring within the semi-arid grasslands of the Agua Fria National Monument located 65 km north of Phoenix, AZ. The goal of these restoration activities is to reduce woody species encroachment, remove lignified plant materials and recycle nutrients within the ecosystem thus improving range conditions for both wildlife species and livestock. Broadcast burning, juniper thinning and slash pile burns are the principle tools used to accomplish resource objectives. Line cover, belt transect, densities, heights and biomass of vegetation data were collected to determine the response of the vegetative community to habitat restoration activities. Principal Component Analysis (PCA) was used to reduce data analysis to the more influential factors. Regression analysis was conducted for statistically significant response variables. Quadratic regression analysis found low predictive values. In broadcast burn treatment units, all important factors as identified by PCA had low predictive factors but significantly differed (R2 <0.01, p<0.05) between unburned and the years post treatment. Regression analysis found significant, albeit weak, relationships between time since treatment and independent variables. In pile burn treatment units, data reduction by PCA was not possible in a biologically meaningful way due to the high variability within treatment units. This suggests the effect of juniper encroachment on grassland vegetation persists long after junipers have been cut and burned. This study concluded that broadcast burning of the central Arizona grasslands does significantly alter many components of the vegetative community. Fuels treatments generally initially reduced both perennial woody species and grasses in number and height for two year post fire. However, palatable shrubs, in particular shrubby buckwheat, were not significantly different in broadcast burn treatment areas. The vegetative community characteristics of juniper encroached woodlands of central Arizona are unaffected by the removal and burning of junipers aside from the removal of hiding cover for predators for multiple years. It is recommended that habitat restoration activities continue provided the needs of wildlife are considered, especially pronghorn, with the incorporation of state and transition models specific to each of the respective ecological site descriptions and with the consideration of the effects of fire to pronghorn fawning habitat. Dissertation/Thesis M.S. Applied Biological Sciences 2014 |
| 英文关键词 | Natural resource management Biology Disturbance Response Fire Juniper Pronghorn Shrubby Buckwheat Tobosa |
| 语种 | 英语 |
| URL | http://hdl.handle.net/2286/R.I.25079 |
| 来源机构 | Arizona State University |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/248389 |
| 推荐引用方式 GB/T 7714 | [null]. Semi-arid Grasslands Vegetative Community Response to Prescribed Broadcast Burns and Juniper Thinning and Pile Burning in Central Arizona[D]. Sitzmann, Paul Roman (Author), Miller, William (Advisor), Alford, Eddie (Committee member), Green, Douglas (Committee member), Arizona State University (Publisher),2014. |
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