Influence of leachates from western juniper slash on three native grasses Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nc580p48b

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Paired 30-day trials were conducted to evaluate Agropyron spicatum germination when treated with two concentrations of throughfall leachates from western juniper slash in two stages of decomposition. Data from a second pair of 49-day greenhouse trials were analyzed to evaluate emergence and growth of Aqropyron spicatum, Oryzopsis hymenoides, and Poa ampla when watered with throughfall leachates from fresh green slash and year-old red slash from western juniper. The objectives of these studies were to assess plant responses to the addition of chemicals derived from the leachates. Few differences in ion concentrations were evident between the two slash sources. No detectable quantities of nitrogen were leached from either source. Losses of Al, B, P, S, and Sr appeared greater from the red slash than from the green slash. Real additions of nutrients from slash relative to controls appeared greatest for Al, B, Ca, K, Mg, Na, P, S, and Sr. Leachates did not affect Agropyron spicatum germination, and final total emergence of the 3 test species was unaffected by either leachate. Leachates generally inhibited growth, but effects varied among species depending upon the parameter measured. Red slash leachates most often inhibited growth significantly, while effects of green slash leachates were intermediate and seldom significantly reduced growth. Growth of Oryzopsis hymenoides was the least inhibited by leachates, while Poa ampla growth was very much inhibited by leachates. A further objective of the study was to explore allelopathic inhibition of ion uptake as a possible explanation for the observed general pattern of reduced growth associated with the leachates. A sample of the red slash leachate contained 5x more volatile compounds than a paired sample from the green slash leachate, and contained 4 phenolic compounds while the green slash leachate contained no detectable phenolics. The lack of phenolics may explain the relatively more moderate inhibition of growth caused by the leachates from the green slash. Morphological responses did not indicate reduced availability or uptake of nitrogen due to allelopathic inhibition, but may implicate interference with uptake of other ions or inhibition of growth hormone functions. Implications are discussed for slash management on sites converted to improve productivity.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B+W), using Capture Perfect 3.0.82, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2009-06-19T17:17:01Z (GMT). No. of bitstreams: 1 Ramsey_Katherine_J_1990.pdf: 720705 bytes, checksum: 8bf484e8d5ff2062d72f51bbd85c1494 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2009-06-19T17:17:01Z (GMT) No. of bitstreams: 1 Ramsey_Katherine_J_1990.pdf: 720705 bytes, checksum: 8bf484e8d5ff2062d72f51bbd85c1494 (MD5)
  • description.provenance : Rejected by Patricia Black(patricia.black@oregonstate.edu), reason: on 2009-06-19T17:10:58Z (GMT)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2009-06-19T16:46:54Z (GMT) No. of bitstreams: 1 Ramsey_Katherine_J_1989.pdf: 723165 bytes, checksum: 65c8b4b42a5d15390a88465068db0663 (MD5)
  • description.provenance : Submitted by Sara Mintonye (smscanner@gmail.com) on 2009-06-19T00:48:04Z No. of bitstreams: 1 Ramsey_Katherine_J_1989.pdf: 723165 bytes, checksum: 65c8b4b42a5d15390a88465068db0663 (MD5)
  • description.provenance : Submitted by Sara Mintonye (smscanner@gmail.com) on 2009-06-19T17:00:13Z No. of bitstreams: 1 Ramsey_Katherine_J_1989.pdf: 655902 bytes, checksum: 0d975815f3f65bf76cdfd77a4162eb2a (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2009-06-19T17:16:50Z (GMT) No. of bitstreams: 1 Ramsey_Katherine_J_1990.pdf: 720705 bytes, checksum: 8bf484e8d5ff2062d72f51bbd85c1494 (MD5)
  • description.provenance : Submitted by Sara Mintonye (smscanner@gmail.com) on 2009-06-19T17:16:33Z No. of bitstreams: 1 Ramsey_Katherine_J_1990.pdf: 720705 bytes, checksum: 8bf484e8d5ff2062d72f51bbd85c1494 (MD5)
  • description.provenance : Rejected by Patricia Black(patricia.black@oregonstate.edu), reason: Remove signatures on 2009-06-19T16:53:18Z (GMT)

Relationships

In Administrative Set:
Last modified: 08/01/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items