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Ramesh P. Sapkota,Peter D. Stahl,Urszula Norton 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.1
Assessing diameter distribution is an approach of observing regeneration strategies and impacts ofanthropogenic disturbances on forest structural attributes. In this study, we evaluated the differences indiameter distributions in highly disturbed, moderately disturbed, and undisturbed forest sites of BufferZone Community Forests (BZCFs), viz. Janajagaran BZCF, Musharni Mai BZCF, and Radha Krishna BZCF ofCentral Terai, Nepal. Weibull and gamma distributions were fitted to explain changes in frequency distribution of diameter data collected. We observed a significant decrease in species richness (overall:p < 0.001) and density of smallest diameter class (0e10 cm diameter at breast height) stems (overall:p < 0.001) with increasing disturbances. Similarly, increase in median diameters (p < 0.01) and parameters of Weibull’s and gamma distributions along gradients from undisturbed to highly disturbedforest sites (except between moderately disturbed and undisturbed sites of Musharni Mai BZCF) wereobserved. Bowley coefficient of skewness was lower in all highly disturbed sites of BZCFs showingreduction in right skewness of the distribution curves with disturbances. These results indicateanthropogenic disturbances shift diameter structure of forests stands, negatively affecting abundance ofsmall diameteresized woody species and shifting Shorea robusta mixed forests towards even-agedstands.
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