PARENT SESSION
Poster Session #5: Soil Ecology.
Monday, August 6, 2001. Presentation from 10:30 AM to 12:00 PM. Exhibition Hall
128
Factors governing soil respiration in three hardwood forests of Korea.
Doh, Sueyoung1, Kang, Sinkyu1, Lee, Dongsun1, Lee, Dowon1, 1
ABSTRACT- This study aims at finding the factors that control soil respiration in three hardwood forests. In situ soil respiration and the relevant environmental factors were investigated from November, 1999 to October, 2000. Soil respiration was measured using an infrared gas analyzer. Mineral soil respiration was measured from incubated soils using alkaline absorption method. Annual soil respirations of Mt. Nam, Kwangnung, North and South sites of Mt. Jumbong were 9298, 7724, 6937, and 6782 kgCO2/ha/yr, and Q10 values 3.8, 3.1, 5.6, and 5.3, respectively. Soil temperature was determined as a primary factor to control the seasonal pattern of soil respiration at all the sites. The effect of soil water content was ambiguous in the case of in situ soil respiration, but a significant factor in the case of mineral respiration. Soil organic matter content did not show significant relationships with soil respiration at all the sites. C:N ratio showed a strong correlation with Q10 values. It implies that the temperature sensitivity of soil respiration is high in fertile soil. Soil temperature and soil water content affected the correlations between mineral respiration and C:N ratio. The correlations were negative when the temperature is over 15 °C but positive when the temperature is 5 °C.
KEY WORDS: soil respiration, soil temperature, C:N ratio, Q10 value