| Abstract |
- The need to preserve Oregon's estuaries has been expressed
through the Land Conservation and Development Commission's Estuarine
Resources Goal 16. The first use of the mitigation guideline set forth
in this goal is in the Coos Bay estuary. The proposed North Bend
Airport runway extension will fill 32 acres (13 ha) of tideland
in Coos Bay. Mitigation of this fill is the breaching of the dikes
in upper Joe Ney Slough near Charleston, Oregon, 6.5 miles (10.5 km)
southeast of the airport site.
Vegetation and elevation data were gathered in the diked portion
of Joe Ney Slough, a control site, and an area of marsh adjacent to
the proposed runway extension. Through comparsion of vegetation and
elevation at the Joe Ney Slough and control sites, the historic and
future pattern of salt marsh vegetation is interpreted.
Thirteen plant communities are identified by cluster analysis
of 682 vegetation samples from the Joe Ney Slough site: 1) Eleocharis-
Agrostis alba, 2) Eleocharis-Juncus effusus var. pacificus-Jussiaea,
3) Juncus effusus var. gracilis-Lotus, 4) Oenanthe-Juncus effusus
var. pacificus-Agrostis alba, 5) Carex lyngbyei, 6) Carex obnupta,
7) Agrostis alba-Potentilla, 8) Agrostis alba-Alopecurus-Potentilla,
9) Juncus balticus, 10) Holcus-Agrostis tenuis-Ranunculus, 11) Ranunculus,
12) Agrostis tenuis-Festuca arundinacea, 13) Festuca arundinacea-
Agrostis tenuis. Total community biomass is mostly proportional to
its areal extent. A vegetation and elevation map, both at a scale of
1 to 2,450, are presented.
Seven plant communities are identified by cluster analysis of
66 vegetation samples from the control site: 1) Salicornia, 2) Carex
lyngbyei, 3) Deschampsia-Juncus balticus-Triglochin, 4) Agrostis alba-
Triglochin-Plantago, 5) Agrostis alba-Potentilla, 6) Juncus balticus-
Agrostis alba-Potentilla-Festuca rubra, 7) Potentilla-Festuca rubra.
Biomass data indicate that standing crop is higher in this natural
marsh than in the diked area. A vegetation map of this site at a
scale of 1 to 1,420 is presented.
Analysis of 329 vegetation samples from the airport site identified
a Salicornia community at elevations higher than 1.4 m above
Mean Lower Low Water (MLLW). Upon dike breaching, 12.5 percent of the
land area within the mitigation site can be expected to become mudflat.
All but a few species present in this area today can be expected to
disappear with reinstatement of estuarine waters. Salt marsh species
associated with silty substrates are expected to become established
between elevations of 1.4 and 2.4 m above MLLW.
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| Additional Information |
- description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-11-14T23:15:40Z (GMT) No. of bitstreams: 4
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- For master (tiff) digital images of maps contained in this document contact scholarsarchive@oregonstate.edu
- description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-11-25T18:25:01Z (GMT) No. of bitstreams: 4
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- description.provenance : Made available in DSpace on 2013-11-25T18:25:01Z (GMT). No. of bitstreams: 4
TaylorAlanH1980.pdf: 1197987 bytes, checksum: 4d63b7c5805556e8a33d04905666edf6 (MD5)
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Plate 3.jpg: 529642 bytes, checksum: 01415c166aceafec32e305b2b6daae04 (MD5)
Previous issue date: 1979-06-06
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