Productive Structure and Net Production of a Larix leptolepis Planatation

낙엽송 인공 조림 임분의 생산구조와 생산성

This study was to investigate the productivity of 24-year-old Larix leptolepis plantation in the Experimental Forest of Chungbuk National University located in Mt. Worak, Chungchungbuk-do, Korea. Eight plots(l0m x l0m) were established in the larch plantation in the 9th compartment. Eight sample trees were selected and cut off. Stem, branches and leaves were weighed respectively with the stratified clipping method, and analyzed for productive structure. The allometric regression equations between dry weight of each component(stem, branches. and needles) and D$^2$H were obtained. The results obtained are summarized as follows; (1) Photosynthetic layer of Larix leptolepis was shown at about 13m in height, and maximum needle amount of crown at 15-l6m in height. (2) The total biomass of aboveground was 186.25tons/ha(86.3% from stem, 9.9% from branches and 3.8% from needles). (3) Annual net production of aboveground was 12.17tons/ ha/yr, and the ratios of stem, branches and needles to that of aboveground, 0.835, 0.12, and 0.045, respectively.

충북 월악산 지역 24년생 낙엽송 조림지의 생산력을 조사하기 위해 8본의 표본목을 벌목하여 부위별(줄기, 가지, 잎)로 생중량을 측정하고 생산구조를 조사한 결과를 요약하면 다음과 같다. (1) 낙엽송의 광합성부는 지상 13m에서 시작되며, 수관의 최대광합성층은 15-16m에서 나타났다. (2) 지상부의 현존량은 줄기 160.75ton/ha(86.3%), 가지 18.42ton/ha(9.9%), 잎 7.08ton/ha(3.8%)이었고 전체 지상부의 현존량은 186.25ton/ha이었다. (3) 연순생산량은 줄기 10.17ton/ha/yr, 가지 1.47ton/ha/yr, 잎 0.54ton/ha/yr이었으며, 전체 순생산량은 12.17ton/ha/yr로 나타났다. 순생산량에서 전체에 대한 각 기관별 비율은 줄기 83.5%, 가지 12.0%, 잎 4.5%로서 가지와 잎의 부위가 낮은 비율을 보이고 있었다.