earticle

영어

Tree cutting is commonly performed using chainsaws in South Korea. While the chain is rotating, the oil pump releases lubricant from the reservoir on the guide bar as the throttle is pressed. Sawdust, stained with released lubricant, is sprayed on the surface soil during tree cutting. And some released lubricant droplets are scattered on the ground directly. This study was conducted to assess the effect of lubricant on forest soil properties in a nursery field. We examined the persistence of 16PAHs and TPH in lubricant scattered soil and monitored the changes in soil biological properties (soil respiration, soil bacterial community richness and diversity) from November 15th, 2021 to September 19th, 2022. The research site included a total of 4 plots consisting of one control plot (CP) and three treatment plots (T-plot), and each plot consists of three subplots (3✕3 m; a total of 12 subplots). Three different types of lubricants of 100 ml/m2 were scattered on the soil surface of each T-plot (Bio-oil scattered plot, BP; Premium mineral oil scattered plot, PMP; Mineral oil scattered plot, MP) on November 16th, 2021. After approximately six months of lubricant scattering treatment, the concentration of soil increased in BP by 346.9%, PMP by 138.1%, MP by 691.9%, and soil TPH concentration decreased in BP by 48.2%, PMP by 24.0%, and increased in MP by 124.5%. The average soil respiration within the study period was lower at PMP (0.46 g CO2/m2/hr) than at CP (0.54 g CO2/m2/hr), BP (0.57 g CO2/m2/hr), and MP (0.59 g CO2/m2/hr), but there was no significant difference (p<0.05). In addition, lubricant type had no significant effect on soil bacterial community richness and diversity during the study period (p<0.05).