Two greenhouse studies were undertaken: (1) To assess the effects of prescribed fire frequency on AM spore abundance, species variety, and AM percent root colonization of Sudan grass Sorghum sudanese L., between an annually burned site, and a seven-year burned site on a loblolly pine, Pinus taeda L. stand, at Schenck Forest, Wake County, NC., (2) To determine the effects of two levels of fire intensity of pile burning (343oC- 371oC and >470oC), at two depths (0-2cm and 3-6cm), by year and season, on AM fungal spore abundance, AM species variety, and AM percent root colonization of Sudan grass Sorghum sudanese L. at James Goodwin Forest, Moore County, NC. All soil samples were air-dried at room temperature (23oC), stored at 4oC prior to use as inoculum in a greenhouse trap culture. At Schenck Forest, repeated fire was found to impact AM spore abundance though less affecting the species variety. The seven-year burned site had higher number of spores overall. The percent root colonization study revealed non-significant effects of repeated fire between the annually burned and the seven-year burned sites. The percent AM fungal root colonization in spring was always significantly higher than in summer at the annually burned site, but always higher in summer than in spring at the seven-year burned site. Summer had significantly more spores than spring. At James Goodwin Forest, fire disturbance coupled with mild soil surface erosion induced a highly significant difference in AM percent colonization between the control and the disturbed sites pre-burn and burn. Fire disturbance significantly affected AM root colonization by depth compared with unburned. The response of AM root colonization to disturbance is very significantly site specific. The effect of fire intensity is significantly affected by vertical distribution of the propagules. Species variety at both Schenk Forest and James Goodwin Forest non-significantly decreased, propagules survived from high intensity fire but spore numbers were significantly reduced.
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-01302003-112253 |
| Date | 05 February 2003 |
| Creators | Rabe Ranjanivo, Mialy-Tiana |
| Contributors | Dr. Arthur G. Wollum, Dr. Thomas J. Smyth, Dr. Gerald C. Van Dyke, Dr. Charles. B. Davey |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-01302003-112253/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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