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KMID : 0380119830060010033
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Korean Journal of Ecology
1983 Volume.6 No. 1 p.33 ~ p.44
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Studies on the Population Dynamics of Pine Needle Gall Midge, Thecodiplosia japonensis, by Diversity of Vegetation Structure
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Abstract
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Vegetation structure and population dynamics of pine needle gall midge were investigated from 1980 to 1982 at the southern part of Palgong mountain near Daegu. The results of investigation at the areas of A(pure stand), B(30% mixed forest) and C(60% mixed forest) were as follows;
Vegetation of 3 areas were not classified by the species diversity, but by the unequal distribution of Alnus hirsuta, Robinia pseudo-acacia, Lespedeza cyrtobotrya, Quercus variabilis and vitality of Pinus densiflora at the area C was low, due to the shadow by broad-leaf trees. Soil environmental factors at 3 areas were not characteristic, but the averages of humus contents showed high significance and the order was A<B<C. The variation of larvae density in soil during the years studied decreased and the greater damage was resulted in the mixed stand than in the pure stand. Percentage of gall in the crown and number of larvae in the gall decreased gradually by years, but no significance between the main shoots and lateral shoots was appeared.
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