Aboveground biomass, distribution of N and P in tree components, forest floor and the top 20cm of mineral soil, and litterfall were determined in adjacent 37-year-old plantations of Pinus rigida Mill. and Larix leptolepis Gord. on a sandy clay loam soil in Yangpyeong, Kyonggi Province. Total above-ground tree biomass for P. rigida and L. leptolepis were 138,2 and 127.2 t/ha, respectively, and did not differ between the two species. Nitrogen concentrations in stembark and foliage were all greater in L. leptolepis. Understory biomass contributed less than 2.0% of the total aboveground biomass lbut contributed up to 12.0% of the aboveground nutrient contents. Soil below L. leptolepis had higher concentrations of N and P. Total ecosystem N content (㎏/㏊) was greater for L. leptolepis (5,579) than P. rigida (4,147). Litterfall dry mass (㎏/㏊/yr) was greater for P. rigida (6,020) than L. leptoteliis (4,191) whereas N contents in leaf litterfall (㎏/㏊/yr) was almost twice as large in L. leptolepis (28) than P. rigida (16). This common garden experiment suggests a strong influence of tree species on nutrient distribution and cycling in a forest ecosystem.