돼지풀 잎에서 검정된 monoterpenoids는 약 29종이었고, 그 가운데 octene, α-ponene, β-myrcene, 1,3,6-octatrine, endo-borneol, (-)-bornyl acetate의 함량이 높다. Monoterpenoids 총 함량은 초봄부터 점차 증가하여 7월에 가장 높았고 그후 감소하였다. 돼지풀 잎에 함유된 휘발성물질은 수용체 유식물의 뿌리와 줄기 생장에 억제효과를 나타내었으며, 생엽량의 증가에 따라 억제효과도 증가하였다. 이에 따른 억제효과 차이의 유의성은 대부분이 P＜0.05 수준이었다. 억제효과는 처리식물에 따라 큰 차이가 있었다. 돼지풀 생엽의 채취시기에 따른 유식물 생장 억제효과의 경향성은 대부분의 처리식물에서 7월＞6월≥5월 순 이었다.

The total amount of monoterpenoids in A. artemisiifolia var. elatior leaves was increased continuously after Apr. and the highest amount was in Jul. The major monoterpenoids in A. artemisiifolia var. elatior leaves were consisted of 29 compounds and were dominated by No. 2, octene, α-ponene, β-myrcene, 1,3,6-octatrine, endo-borneol and (-)-bornyl acetate. The allelopathic effects of A. artemisiifolia var. elatior leaves on the roots and shoots elongation of selected plants were studied and there were significant allelopathic effects. The effects were much different between the selected plants and the effects significantly became higher with the quantity of leaves used in the experiment. The Lactuca sativa, Achyranthes japonica, and Oenothera odorta were suffred much higher effects than the other species. The allelopathic effects were also different with the leaves sampled in different seasons and the effects in july were found a little higher than in June and May.Estimation of the annual net production, nitrogen (N) and base cation (BC=K, Mg, Ca) uptake by stocked forests in South Korea has been done with national statistical data of forestry from 1995 to 1999. The annual net production of stems and branches was about 1.8 ton DM ha^-1 yr^-1. The net productivity of deciduous forests was higher than that of coniferous forests. Total net production of theh stocked forests from the whole stocked area of South Korea of 6.246×10 exp(6) ha, was about 1.13×10 exp(7) ton DM/yr, and the total harvested biomass obtained from timber production data in 1999, was estimated about 6.1×10 exp(5) ton DM/yr that was equivalent to 98 ㎏ DM ha^-1 yr^-1. Net growth uptake of N and BC were 350 ㏖_c ha^-1 yr^-1, respectively, and the content of N and BC contained in the harvested biomass were 20 ㏖c ha^-1 yr^-1 and 16 ㏖c ha^-1 yr^-1, respectively. Net uptake of N was higher than that of BC. Total net uptake of N and BC from growth and harvest by stocked forests in South Korea were 2.309×10^9 ㏖_c/yr and 1.953 ×10 exp(9) ㏖_c/yr, respectively.