Effects of forest fire on soil arthropods at Phu Kradung National Park, Changwat Loei
1996
Arporn Udomsilp
Study of effects of forest fire on soil arthropods at Phu Kradung National Park, Changwat Loei was carried out in the hill evergreen forest, pine forest, mixed deciduous forest and dry dipterocarp forest of the Park in March 1994. Changes of diversity, density and roles of soil arthropods on forest ecosystem after fire were investigated. Ten temporary plots of 1*1 square m were laid out in areas of prefire and postfire of each forest type. Litter, duff, humus and five centimeters depth of surface soil within each plot were collected. Soil arthropods were then separated from the collected samples and classified into classes, orders, families, and genera and counted the individual numbers. After fire, diversity and density of soil arthropods decreased in all forest types. Soil arthropods in the pine forest were the most decrease in percentages of class, order, family, genus and individual which were 20.00, 47.37, 54.55, 63.64, and 73.22, respectively. The subsequence decrease of these percentages were in the mixed deciduous forest, dry dipterocarp forest and hill evergreen forest, respectively. In the hill evergreen forest which had the least decrease in percentages of class, order, family, genus and individual. The figures were 0.00, 27.27, 32.08, 53.06, and 53.96, respectively. With respect to the roles of soil arthropods on the forest ecosystem, both prefire and postfire in all the forest types the highest number of soil arthropods found was secondary consumer, then was decomposer and the lowest was primary consumer. After fire, the number of all the arthropods classified by roles decreased highly due to the decrease in numbers of genera and individuals.
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