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Some findings on vegetative and sexual reproduction of koa

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Title: Some findings on vegetative and sexual reproduction of koa
Authors: Spatz, Gunter
Keywords: Acacia koa
LC Subject Headings: Koa -- Hawaii.
Koa -- Reproduction.
Issue Date: Feb 1973
Publisher: Island Ecosystems IRP, U.S. International Biological Program
Citation: Spatz G. 1973. Some findings on vegetative and sexual reproduction of koa. Honolulu (HI): Island Ecosystems IRP, U.S. International Biological Program. International Biological Program Technical Report, 17.
Series/Report no.: International Biological Program Technical Report
17
Abstract: Some environmental factors which influence the reproductive behavior of Acacia koa var. hawaiiensis (Rock) were studied on the east flank of Mauna Loa, Hawaii. Additionally, some factors were tested under controlled conditions. It was found that soil moisture as well as soil temperature in terms of day-degrees are limiting factors for koa germination. Variability among individual seeds in regard to their germination requirements is very great. This results in a functional relationship between germination rates and time. Another important factor appears to be soil aeration as indicated by the stimulating effect of soil cultivation. Dry periods limit survival of germinated seeds. Vegetative suckering is a compensative reproductive behavior in drier and/or cooler areas. But suckering does not occur when the soil is covered by a dense and tall grass sward. Scalping the sward, and to a smaller degree, clipping of the vegetation, stimulates koa suckering. Initial growth in suckers and seedlings depends on temperature, soil moisture and light intensity. It was possible to show some relationships quantitatively.
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.
Sponsor: This part of subproject B-2 of the ISLAND ECOSYSTEMS IRP was supported by additional funds obtained by Dr. D. Mueller-Dombois through the efforts of Mr. Norman Carlson from the BISHOP ESTATE CORPORATION. The financial support of the Bishop Estate is gratefully acknowledged herewith. Mr. Norman Carlson's interest in basic information for koa silviculture provided a strong motivation for this study.
Pages/Duration: 45 pages
URI/DOI: http://hdl.handle.net/10125/25940
Rights: CC0 1.0 Universal
Appears in Collections:International Biological Program Technical Reports (1970-1975)



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