Fractal Analysis on Arbor Forest Landscape of Zha Gana Forest Area in Diebu County
Abstract: With the help of GIS technology, the algorithm about the relation of perimeter-area was used to do the fractal analysis of arbor landscape based on the forest map and survey data of Zha Gana Forest in Diebu. The results showed that 1) the type of arbor landscape was dominated by coniferous forest. The area of fir forest accounted for 50.1 percent of the total area of arbor, and its mean patch area was much larger with the centralized and complete distribution. So the fir was superior forest in arbor forest. The level of mean patch area of Picea asperata was relatively low with dispersed distribution and a higher degree of fragmentation. 2) At the whole level, the fractal dimension for each forest was very close, ranging from 1.1 - 1.3. It explained that the shape complexity of seven species of arbor landscape patches were same. The sequence of fractal dimension for different forest landscape patches is Betula albo-sinensis < Betula platyphylla < Pinus tabuliformis < mixed broadleaf-conifer forest < coniferous mixed forest < Picea asperata < Fir. The fractal dimension for the broad-leaved forest ranged from 1.10 - 1.15; the mingled forest ranged from 1.23 - 1.25; and the aciculiailvae ranged from 1.25 - 1.27. There appears a tendency that the wider area and the higher altitude, the higher fractal dimension will be. To a certain extent, it reflected a higher level of destruction of farmland to vegetation. The fractal dimension for Betula albo-sinensis was minimum, which was the biggest distribution area among broad-leaved forest. 3) Accounted for 90 percent of total area of whole arbor forest in Zha Gana Forest, the species of Picea asperata, Fir and mingled forest were essentially mature or over-mature forest. The fractal dimension calculated by age structure was different among various age groups. The fractal dimension for mature or over-mature Betula platyphylla and mid-aged mixed broadleaf-conifer forest was close to 1.5. The shapes of patches were complex and in an unstable state. The fractal dimension for middle- aged Betula albo-sinensis was close to 1. The distribution shape was the most regular and single one; it was the type that suffered the farmland destruction most.
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