Effects of season and interval of prescribed burns on pyrogenic carbon cycling in ponderosa pine stands in Malheur National Forest Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2227mv069

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  • In ponderosa pine (Pinus ponderosa) forests of the western United States, prescribed fires are used to reduce fuel loads and restore historical fire regimes. The season in which prescribed burns are performed and the interval between burns can have complex consequences for the ecosystem, including soil carbon cycling through the production of pyrogenic carbon (PyC). PyC is a broad term that refers to a spectrum of thermally-altered organic matter. PyC plays a crucial role in soil carbon cycling, displaying turnover times that are orders of magnitude longer than unburned organic matter. This work investigated how the season of and interval between prescribed burns affects the formation and retention of pyrogenic carbon (PyC) in a ponderosa pine forest of eastern Oregon. In 1997 a season and interval of burn study was implemented in Malheur National Forest to examine the ecological effects of burning at 5 and 15-year intervals in either the spring or fall. In October 2015, both O-horizon and mineral soil (0-15 cm) samples were collected and analyzed for PyC concentration, content, and structure using the benzene polycarboxylic acid (BPCA) method. O-horizon depth, carbon and nitrogen concentration and content, pH, and bulk density were also measured. Compared to unburned controls, we estimate that fall burns increased the PyC concentration of the mineral soil by 8.4 g BPCA kg C (95% CI: 4.2,12.6 g BPCA kg C). No change in PyC concentration of the O-horizon was detected for the plots burned in either the spring or fall compared to the unburnedcontrols; however, the chemical structure of the PyC in the O-horizon of the unburned control plots was significantly more condensed than that of the plots burned in either the spring or the fall.
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  • description.provenance : Submitted by Lauren Matosziuk (matoszil@oregonstate.edu) on 2017-09-13T21:19:48ZNo. of bitstreams: 2license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5)MatosziukLaurenM2018.pdf: 3089023 bytes, checksum: cce11689fe8371bac228813388845877 (MD5)
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  • description.provenance : Rejected by Darcy Miller(darcy.miller@oregonstate.edu), reason: In the Table of Contents please add Page (underlined) on the right side above the first listing.On the second page of the LIST OF FIGURES please put (Continued), instead of CONTINUED.Thank you,Darcy on 2017-09-13T21:36:00Z (GMT)
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  • description.provenance : Rejected by Darcy Miller(darcy.miller@oregonstate.edu), reason: Hi Lauren,Your thesis is being rejected for the following reasons:1. Please remove the blank page between the Acknowledgements and Table of Contents.2. In the List of Figures you need to put Figure (underlined) on the left side and Page (underlined) above Figure 1 (please use your edited pretext pages for a reference).3. On the next List of Figures page put LIST OF FIGURES (Continued) at the top, and then Figure and Page above the first figure listing.4. On the List of Tables put Table (underlined) on the left side and Page (underlined) on the right side above the first Table listing.As soon as you have made these corrections you can re-upload your thesis.Thank you,Darcy MillerGraduate School on 2017-09-13T21:01:07Z (GMT)
  • description.provenance : Submitted by Lauren Matosziuk (matoszil@oregonstate.edu) on 2017-09-13T22:59:48ZNo. of bitstreams: 2license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5)MatosziukLaurenM2018.pdf: 3089441 bytes, checksum: ab95ac4541106bd7fe43f10b25aeef92 (MD5)
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  • description.provenance : Submitted by Lauren Matosziuk (matoszil@oregonstate.edu) on 2017-09-13T20:31:06ZNo. of bitstreams: 2license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5)MatosziukLaurenM2018.pdf: 3090674 bytes, checksum: b417d962b389b4dc57de93f43c982a87 (MD5)

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