earticle

영어

Severe droughts may alter soil bio-geochemical properties thereby affecting carbon balance in a forest ecosystem. In order to examine the major driving factors affecting forest soil responses during drought, we conducted rainfall exclusion experiment by excluding throughfall using transparent roofs in a coniferous plantation. Three replicates of 6 x 6 ㎡ throughfall exclosures were constructed to manipulate precipitation while throughfall fully exposed adjacent three control plots. Soil respiration (SR) was measured about bi-weekly by separating autotrophic and heterotrophic CO2 efflux with soil temperature and moisture, and examined the relationship between soil temperature and soil moisture at soil depth 10 cm. SR was significantly higher (P<0.05) in control plots (707.61 mgCm-2h-1) compared to roof plots (325.53 mgCm-2h-1). The relationship between soil temperature and total SR, autotrophic (AR) and heterotrophic respiration (HR) were stronger in roof plots than control plots. The relationship between any type of soil respiration and soil water content (%) didn’t show clear relationship for both exlusion and control plots. This study will increase our understanding of the main drivers affecting forest soil CO2 response under drought stress.