<p>This study wasconducted in a 14-year-old midrotation loblolly pine (<i style='mso-bidi-font-style:normal'>Pinus taeda</i> L.) plantation to assess the effects of fertilizationand vegetation control (a) on soil net nitrogen mineralization, (b) litterdecomposition and (c) foliar nutrient concentrations and use, and vegetationgrowth. Fertilization (none, 224 kg haP) and vegetation control (none, complete) treatments were applied in a 2x2factorial design in March 1998. Soil net nitrogen mineralization was assessedby monthly field and laboratory incubations, litter decomposition and nutrient(N, P K, Ca, Mg, S, Mn, Zn, B, Cu) release dynamics were determined by thelitterbag method, foliar nutrient use of pines and hardwoods was estimated fromlitterfall and foliar nutrient concentrations, and growth was determined basedon annual measurements of diameter and height. Field net N mineralization rateswere 19, 18, 31, and 78 kg ha for control (C, notreatment), fertilization (F), vegetation control (VC), and vegetation controlplus fertilization (VC+F) treatments, respectively. Relative treatments responseswere similar in the laboratory incubations. Litter mass loss duringdecomposition was reduced by 9% after 32 months by vegetation control, andfertilization had no effect. The mobility of the nutrients was as follows: Cu≤N≤S<P<Zn≤Ca<K≤Mn<Mg≤B.Pine foliar N and P concentrations, and N and P use were significantlyincreased by fertilization, while effects of vegetation control on theseparameters were usually not significant. Fertilization significantly increasedannual volume growth of loblolly pine by up to 7 myr (32%) over the three years, while vegetation control had nosignificant effect.<P>
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-20020110-122719 |
| Date | 10 January 2002 |
| Creators | Gurlevik, Nevzat |
| Contributors | H. Lee Allen, Daniel L. Kelting, Barry Goldfarb, Udo Blum |
| 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-20020110-122719 |
| 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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