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KMID : 0380319750150000101
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Journal of Korean Research Institute for Better Living
1975 Volume.15 No. 0 p.101 ~ p.105
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A study on the Continous variation of contifer-hardwood forest vegetation relation continum index, Mt. NAE-JANG SAN, Korea.
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Abstract
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First, for each forest stand sampled, three values were determined for each tree species X; e.g., Reative density, Relative frequency, and Relative cover.
The three values are summed up to obtain for each species its importance in value; since each of the three is a percentage ranging from 0 to 100, the scale of importance values ranges from 0 to 300.
The author then averaged together all the stands with the same leading species(with the high importance value) to determain the results given in Table 1.
The author arranged together those dominant factors which seemed most similar. For example, Acer japonica stands are clearly more similar to stands of Daphniphyllum macropodum than to stands of pinus densiflora. so that the author recognized this by giving an arbitrary rank value between 1 and 10 to each species.
The end points are clear: Set Pinus densiflora at rank 1 and Daphniphyllum macropodum at 10.
Intermediate ranks are more arbitrary.(Table 2)
Finally, the author determined the continuum index for each stand from the formula.
Continuum index=∑〔(importance vaue)×(climax adaptation number)〕 Where the sum is taken over all species. The continuum index is assumed to measure a complex environmental gradient in much the same way as elevation up a mountainside.
The author can this plot the imporance values for all the three species against the continuum index.(Fig.1)
The environmental variables reponsible for the vegetation gradient can be studied in relation to the continuum index in the same way that one can measure changes in stands up a mountainside.
Fig.2 shows that the water contents of the upper soil layer(Ahorizon) varies with the continuum index.
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