일본 서부 낙엽활엽수림의 차단 강수가 토양호흡에 미치는 영향 평가

Abstract

To estimate the effect of rainfall on soil respiration, soil efflux was measured with a manipulation of rainfall interception at a broad-leaved deciduous forest in western Japan from 20 February to 19 November 2001. The diurnal patterns of soil respiration observed at the intercepted subplot () were quite similar to those of soil temperature at 0.2 m depth with a maximum around midnight and a minimum from noon to early afternoon. Such diurnal patterns have not been observed in the previous studies at the same study site under natural conditions (which manifested no clear diurnal variations). Furthermore, the magnitudes of showed substantial differences (e.g., ~50% reduction under water-limited conditions) compared to those of the potential soil respiration under natural conditions (). These findings demonstrate that rainfall events not only affected the magnitude of soil efflux but also modified the vertical structure of soil temperature, thereby altering diurnal patterns of soil respiration.