A proposed sampling technique and electronic data processing program for reproduction surveys in forest plantations Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jd472z571

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  • The purpose of this thesis is to determine if the Oregon State Forestry Department's stocking survey system can be applied to planted acres as well as to seeded acres. Two computer programs were developed into a primary program. One produced a new stocking curve adapted to hand planting patterns, and the other determined the stocking from this and a natural reforestation curve in relation to sampling data. Also developed was a three-plot sequential technique to modify any one sampling point. Answers include total number of trees per acre, separated into naturally seeded and planted trees, projecting the answer on a line basis, a 40-acre basis and a project basis. Results of the study showed that: a) erroneous estimates of trees per acre in forest plantations may result from application of the present survey system; b) the proposed survey system has certain advantages over the present system in determining the degree of success in forest plantations; c) by recognizing spacing interval, the proposed survey system brings accuracy to the level necessary to meet present-day planning requirements; d) the proposed survey system will permit construction of sufficiently detailed mapping of voids due to mortality which may occur in forest plantations to develop reforestation plans; e) the proposed survey system will tend to estimate more correctly, where the present system tends to underestimate the number of surviving trees per acre in plantations having a high mortality rate; f) the proposed system permits using fixed radius plots, the radius of which is related to plantation spacing.
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