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Item Description Mueller-Dombois, Dieter en_US Jacobi, James D. en_US Cooray, Ranjit G. en_US Balakrishnan, N. en_US 2008-12-02T19:28:33Z 2008-12-02T19:28:33Z 1977-12 en_US
dc.identifier.citation Mueller-Dombois D, Jacobi JD, Cooray RG, Balakrishnan N. 1977. Ohia rain forest study: ecological investigations of the ohia dieback problem in Hawaii. Honolulu (HI): Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany. PCSU Technical Report, 20. en_US
dc.description Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in. en_US
dc.description.abstract This final report summarizes the more important results of a two year study of the ohia (Metrosideros collina subsp. polymorpha) rain forest, extending from within Hawaii Volcanoes National Park north across the east flank of Mauna Kea, Island Hawaii. The study focus was on the ohia dieback which occurs in many areas of this terrain. A 1:48,000 vegetation map was produced, which is included in selected copies of this report. In addition, an independent habitat classification was developed from physical soil and moisture regime differences occurring in the area. Over 35 ohia forest stands were sampled in detail for their ohia population structures and 39 releves were analyzed for their floristic content. Five different forms of dieback were recognized. Two of these, called the Dryland and Wetland Diebacks appear to be the more rapid and dramatic forms. Their causes are not from disease or insect attack, but are presumed to be from climatic triggers, acting through the soil. These diebacks are clearly associated with ohia-stand rejuvenation. A third form of dieback, here called Bog-formation Dieback, appears to be a slower form of stand dieback related to permanent site changes. An Ohia-displacement Dieback occurs in the Olaa Tract area, where tree ferns seem to gradually take over the habitats. Here the dieback cause appears to be overmaturity. Individual tree dieback, the fifth form of dieback, is found as an isolated, but common phenomenon in many non-dieback stands examined. All diebacks appear to have natural causes, which are suggested in detail. A new theory is presented, which proposes that there are a number of dynamic phases, including the dieback, which provide for the perpetuation of the shade-intolerant, dominant tree species (ohia) in this rainforest ecosystem. en_US
dc.description.sponsorship National Park Service Contract No. CX 8000 6 0006 en_US
dc.language.iso en-US en_US
dc.publisher Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany en_US
dc.relation.ispartofseries Technical Report en_US
dc.relation.ispartofseries 20 en_US
dc.subject Metrosideros collina en_US
dc.subject Metrosideros polymorpha en_US
dc.subject.lcsh Ohia dieback -- Hawaii -- Hawaii Island. en_US
dc.subject.lcsh Ohia lehua -- Ecology -- Hawaii -- Hawaii Island. en_US
dc.subject.lcsh Rain forest ecology -- Hawaii -- Hawaii Island. en_US
dc.title Ohia rain forest study: ecological investigations of the ohia dieback problem in Hawaii en_US
dc.type Report en_US
dc.type.dcmi Text en_US

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