In this study, we confirmed that the pesticides flow out into streams during rainfall by the way of helicopter spraying. The maximum concentration was 23 pg·mL-1 and the distribution of concentrations showed similar to the normal distribution. The runoff characteristics of insecticides using helicopter spraying was affected by the elapsed time of the start from spraying until rainy days and rainfall intensity. The pesticide concentrations of sample ranged from 0.65 to 3.04 pg·mL-1. Fish kill did not occurred in the stream and the lake cause of the pesticides runoff. Aquatic animals, such as Orthrias toni, Rhinogobius brunneus, tadpole etc. were still alive in the stream. It indicates that this class of pesticide does not cause toxic to fish by runoff event. However, the honey bee kill event was reported in the spray region during the helicopter spraying period. The further study such as ecotoxicity test is needed to reveal the pesticides effect reach to the ecosystem.

The growth performance of Eastern white pine (Pinus storbus L.) was studied with six provenances in four plantations. All growth performances were significantly different among provenances and plantations. The most outstanding source in volume growth at age 39 is North Carolina in all plantations and this trends had been started from four years old seedlings. In plantations, the growth is best in ChunCheon plantation while that is worst in GunPo plantation. The Effect of plantations was thought to be larger than that of provenances growth of P. strobus. A pattern of growth by ages was different by among plantations and even ate age about 40, the growth was still vigorous. Annual precipitation, foggy days, altitude and sand contents in soil are positively correlated with growth and the correlations between by ages were very high.