Seasonal changes in oxygen consumption rate and redox property of floating peat in a pond in central Japan

Abstract

Seasonal changes and temperature dependence of the oxygen consumption rate were measured in the surface peat of a floating mat. A simple model succeeded in reproducing the seasonal pattern in Eh changes at the peat surface. This included two terms: oxygen supply rate as a function of water-table depth and oxygen consumption rate as a function of temperature and microbial activity. The model explained well the minimum and maximum Eh in July and October, respectively. The activity of aerobic microbes in the peat was important in determining redox properties in the floating mat.

Zero methane emission bogs: extreme rhizosphere oxygenation by cushion plants in Patagonia

“…By contrast, living cushion plants can thoroughly oxygenate the organic peat soil through oxygen leakage from hundreds of root tips per litre of soil. Highly decomposed cushion bog peats are likely to consume little oxygen because of low soil temperatures (4–10°C) (Haraguchi, 1995; Chapman & Thurlow, 1998; Allen et al. , 2002) and carbon densities (50 g C l −1 ).…”

“…By contrast, living cushion plants can thoroughly oxygenate the organic peat soil through oxygen leakage from hundreds of root tips per litre of soil. Highly decomposed cushion bog peats are likely to consume little oxygen because of low soil temperatures (4-10°C) (Haraguchi, 1995;Chapman & Thurlow, 1998;Allen et al, 2002) and carbon densities (50 g C l )1 ). The recalcitrant nature of highly decomposed peat (Chapman & Thurlow, 1998) and the low nutrient availability, such as total P < 0.02% (Reddy et al, 1999), further reduce oxygen consumption.…”

Vertical and Horizontal Distribution of Redox Potential of Soil in Wetland Forests in Lahei, Central Kalimantan, Indonesia

“…Eh value was strongly affected by the water table depth and the consequent emergent and submergent surface conditions at each measurement point. Haraguchi (1991Haraguchi ( & 1995 emergence-submergence seasonal cycle, and the heterogeneity of the Eh on the soil surface appeared 2-3 weeks after the emergence of the soil surface. Relatively high elevation areas (2-3 cm higher than the surounding area) emerged 1-2 weeks earlier than the surrounding areas, and the Eh of the high elevation areas is approximately 300 mV higher than that of the surounding area.…”

Recording relative water table depth using PVC tape discolouration: Advantages and constraints in fens

“…The full discolouration of PVC tape just below the peat layer suggests that reducing conditions could be related to the organic matter. The oxidation-reduction potential is considered as a function of water level, organic matter, temperature and microbial activity in mires (Baas Becking et al 1960;Urquhart & Gore 1973;Haraguchi 1995;de Mars & Wassen 1999). Moisture content in the root zone is dependent on the water level.…”