The in situ SOD (sediment oxygen demand), which takes place with the uptake of dissolved oxygen for chemical oxidation and biological respiration in sediments, was 7.74 rngO₂/m³/h in Pond Yeonjukji at Kangwon National University in October 1999. The composition and organic matter content of sediment were analyzed, also electron transport system activity was examined. The effects of some environmental conditions on SOD were investigated in laboratory with the reaction chamber consisted of sealed, cylindrical chamber through which water was continuously recirculated. The sample of August 3 containing NaN₃ as a respiration inhibitor, did not show the decrease of dissolved oxygen concentration in water column. This result indicated that sediment oxygen consumption in the pond occurred mainly by aerobic respiration. However, chemical sediment oxygen demand was increased in the sample of October 28, which contained a lot of organic matter and showed higher respiration activity.
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