Predicting the spatial variability in soil properties using DSM across Malheur National Forest Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zs25xb871

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  • Soil properties may hold the key to improved predictions of soils during digital soil mapping (DSM), which has developed with a focus on environmental factors external to soil. The spatial variability in soil properties was modeled across Malheur National Forest in eastern Oregon as an approach to improve DSM. The resulting preliminary maps are to be used as a potential source of information to support soil survey efforts in the region. Soil properties predicted using DSM included surface and subsurface soil pH, cation exchange capacity (CEC), base saturation, organic matter content, and percent clay content. A Random Forest (RF) classification model, a data mining algorithm that uses many rule-based decision trees to generate predictions, was used to generate predictive maps for each of the listed soil properties from a limited training dataset. Regression kriging was also attempted using the same dataset, but the distribution and density of sample locations made for a more complicated process and the procedure was only successful when applied to log-transformed subsurface organic matter content data in a smaller area within the forest. Random Forest classification models of soil pH, organic matter content, clay content, and CEC performed reasonably well, although the models could not reliably predict base saturation variability. However, the RF modeling process provides a place to begin determining new avenues for improving our understanding of how soil properties vary across the landscape, and the resulting predictive maps highlight areas in the region that should be more heavily sampled during future soil survey mapping.
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  • description.provenance : Submitted by Elizabeth Seeno (seenoe@oregonstate.edu) on 2015-10-09T19:39:05Z No. of bitstreams: 2 license_rdf: 1223 bytes, checksum: d127a3413712d6c6e962d5d436c463fc (MD5) SeenoElizabethA2016.pdf: 17284907 bytes, checksum: 3cb3c618318c81283cff3c9bba006bf2 (MD5)
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Thanks for making the revisions to the formatting in the pretext pages. Things look much better but there are a few revisions to make 1)Abstract page, the presented date needs to be changed to - September 9, 2015 2) Copyright page - center these 3 lines 3) Title page - change commencement date from 2015 to read - Commencement June 2016 4)Acknowledgement page - center the heading only 5) List of Appendices - APPENDICIES is spelled wrong should be - APPENDICES Everything else looks good. Once revised, log back into ScholarsArchive and submit the new PDF. Thanks, Julie on 2015-10-08T20:19:23Z (GMT)
  • description.provenance : Submitted by Elizabeth Seeno (seenoe@oregonstate.edu) on 2015-10-08T21:59:53Z No. of bitstreams: 2 license_rdf: 1223 bytes, checksum: d127a3413712d6c6e962d5d436c463fc (MD5) SeenoElizabethA2016.pdf: 16304966 bytes, checksum: 8d7d8bea848d6202a0a8a6c06016dbbc (MD5)
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting because none of the revisions were made to the pretext pages. I will email you the revisions again. All the page numbers looked good. You have made the deadline. Once revised, log back into ScholarsArchive and go to the upload page. Replace the attached file with the revised file and resubmit. Thanks, Julie on 2015-10-07T21:45:09Z (GMT)
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Hi Elizabeth, Thanks for making all the revisions. Everything looks good now except the page numbers are missing, the only one showing is page 1. Once revised, log back into ScholarsArchive and replace the attach file with the revised file and resubmit. Thanks, Julie on 2015-10-09T15:46:40Z (GMT)
  • description.provenance : Submitted by Elizabeth Seeno (seenoe@oregonstate.edu) on 2015-10-07T18:49:48Z No. of bitstreams: 2 license_rdf: 1223 bytes, checksum: d127a3413712d6c6e962d5d436c463fc (MD5) SeenoElizabeth2015.pdf: 3435413 bytes, checksum: e3baa244cb6b00c4c50d798d08c4633f (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2015-10-09T22:21:42Z (GMT) No. of bitstreams: 2 license_rdf: 1223 bytes, checksum: d127a3413712d6c6e962d5d436c463fc (MD5) SeenoElizabethA2016.pdf: 17284907 bytes, checksum: 3cb3c618318c81283cff3c9bba006bf2 (MD5)

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