Acknowledgement
This study was supported by the Ministry ofAgriculture and Forestry (203090-3).
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This study was conducted to estimate the biomass and nutrient distribution in understory P koraiensis seedlings invading a mixed forest dominated by Quercus mongolica in central Korea. Total above and belowground biomass for the three overstory and understory dominant tree species were 2.70 Uha for P koreiensis, 210.56 Uha for Q. mongolica, and 28.39 Uha for Q. variabilis. P koraiensis seedlings seemed to allocate more biomass to foliage (31.0% of total biomass) than overstory Quercus spp. (0.9%), so as to exploit the low light flux found in the shady conditions. Furthermore, the high specific leaf area of P koraiensis seedlings indicated morphological characteristics of shade leaves in low light conditions. Total nitrogen (N) and phosphorus (P) contents for P koraiensis seedlings and Quercus spp. were 19.6 and 1.9 kg/ha, and 94.7-626.5 and 9.4-137.6 kg/ha, respectively. Our results suggested that understory P koreiensis seedlings exerted only a minor influence on the biomass and nutrient distribution for the study forest.
This study was supported by the Ministry ofAgriculture and Forestry (203090-3).