골프장 그린에서 토심별 유기물의 경시적 변화

Abstract

The management of soil organic matter(SOM) is a key component of golf course green maintenance. As part of a major project examining the sustainable management of SOM on golf course greens, the SOM status of different age greens maintained in the same root zone composition and management were compared. Then the microbial activity, tiller number, bulk density, water content, pH, EC, and T-N in the soil were measured. In the 0～5cm depth SOM accumulation showed no significant difference between greens. Below 5cm SOM showed a strong significance between greens and had a positive(+) correlation with year and negative(—) correlation with depth. When regression equations were used to predict SOM accumulation with year and depth, SOM below 5cm tended to increase with a rate of 0.061%․year—1 and decrease with a rate of 0.079%․cm—1(R2=0.841). Soil microbial activity was investigated with age and depth by using a dehydrogenase assay. Results showed a sharp drop with depth in all greens. The soil microbial activity below 5cm showed no difference between greens. The accumulated SOM below 5cm may be very resistant to decomposition in the long-term. Five years after establishment, the bulk density did not significantly change. The water content, EC, and T-N had a significant correlation with SOM. The pH decreased with the year, which may influence SOM accumulation. Organic matter accumulation was mainly affected by the pH decrease, low soil microbial activity, and high organic matter resistant to decomposition, but the effects of water content, EC, and T-N were obscure.