Abstract: Tree species is a vital biotic factor in determining the carbon stock of forest ecosystems. In the forested area of Taiyue Mountain, carbon storage in wood, herb and shrub, soil was separately investigated according to the vertical structure of forest ecosystem. Subsequently, the effects of forest type and tree species composition on forest carbon stock were studied. The carbon storage was 156.58, 145.05 and 128.52 t C·hm^-2 in broadleaved forest, coniferous forest and mixed forest, respectively. Significant correlations were found between the carbon storage of forest ecosystem and the proportions of Quercus liaotungensis and of Pinus tabuliformis in forest communities. Carbon storage in wood, soil and total carbon storage of forest ecosystem markedly increased with the volume proportion of Q. liaotungensis, but decreased with that of P. tabuliformis. Although similar relationships were found between wood carbon storage and the proportion of broadleaved tree species and of coniferous tree species, no effects of broadleaved and coniferous tree species were detected on carbon storage of herb and shrub in mixed forest ecosystems. In conclusion, Q. liaotungensis and P. tabuliformis played a more important role than broadleaved and coniferous tree species in manipulating the carbon storage of forest ecosystems in Taiyue Mountain.

Key words: secondary substance, nutritional substance, Frankliniella occidentalis, protective enzyme, detoxification enzyme