| Summary: | 碩士 === 國立臺灣大學 === 昆蟲學研究所 === 92 === Abstract
The effects of canopy gaps on litter microarthropods were examined by the litterbag method. Green foliage of three tree species, Litsea acuminata, Castanopsis carlesii var. sessilis, and Schefflera octophylla, made up 216 litterbags for six months study in two-canopy openness in the Fushan broadleaf forest in northeastern Taiwan. One litterbag of each tree species was collected from each plot at one-month intervals and microarthropods in the litterbags were extracted by the Tullgren funnel. After six months, the remaining leaf mass was less than 50%. The remaining mass of Schefflera octophylla was the lowest, and that of Litsea acuminata was the highest. A total of 27,909 microarthropod individuals were collected, and sorted to 330 morphospecies. Among them, Acari constituted 59.84%, followed by Collembola (25.88%). The species richness of Acari was highest (91), followed by Coleoptera (30) and Collembola (25). Analysis of variance indicated no significant effects of canopy gaps on the densities of litter microarthropods. There were only 14 taxa found in plots with canopy gaps and the other 12 taxa could be found only in canopy closed plots. This phenomenon may help to explore the effects of canopy gaps on special taxa or groups, and the dynamics of litter microarthropod community.
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