How O2 depletion affects to chemical-biologigal interactions at sediment surface?

研制了一种高精度的氧控制器，用于测量船上的扩散氧摄取量。利用O_2控制器和O_2微电极对八户近海（水深500 m，底层112 μ M）、1000 m（36 μ M）和2000 m（70 μ M）沉积物表层O_2浓度进行了测量。用扩散模型计算了各柱样的O2吸收速率，分别为2.7-4.2、0.6-0.7和1.4-1.6mm·m ~（-2）·d ~（-1）。二氧化碳的产生速率估计为2.1-3.1，0.5和1.1-1.2 mmolC m-2 d-1，分别适用Redfield比率。

High precision O2 controller was developed to measure diffusive O2 uptake on board. O2 profiles at sediment surface taken from off Hachinohe (water depth of 500m, 112uM in bottom watear), 1000m (36uM) and 2000m (70uM) were measured with the O2 controller and O2 microelectrodes. O2 uptake in each core was calculated applying diffusion model, and the rates were 2.7-4.2, 0.6-0.7 and 1.4-1.6mm m-2 d-1, respectively. Carbon dioxide production rates were estimated to 2.1-3.1, 0.5 and 1.1-1.2 mmolC m-2 d-1, respectively to apply Redfield ratio.