Dissolved N₂O, CH₄, and CO₂emissions from subsurface-drainage in a structured clay soil cultivated with onion in Central Hokkaido, Japan

Effects of nitrogen addition on dissolved N2O and CO2, dissolved organic matter, and inorganic nitrogen in soil solution under a temperate old-growth forest

“…The concentrations were within the range from 2 to 35 μg C ml − 1 as DOC in soil solutions of B horizons under temperate forests, which were synthesized by Michalzik et al (2001). In our study, the concentrations of dissolved CO 2 in the soil solutions at various depths were smaller than those reported by Sawamoto et al (2003), who observed that concentrations of dissolved CO 2 in arable soil solutions ranged from 15.5 to 30.7 μg CO 2 -C ml − 1 . Among all the tested properties, there was a better correlation between the concentrations of dissolved CO 2 and DOC in soil solutions at various depths for all the sampling dates (Table 3).…”

Comparison of indirect nitrous oxide emission through lysimeter drainage between an Andosol upland field and a Fluvisol paddy field

“…In particular, indirect N 2 O emission through groundwater is susceptible to the influence of the upper soil and the land use because the upper soil interacts so strongly with agricultural management. Recent monitoring studies have reported that snowmelt and heavy rain (Sawamoto et al 2003), flooding of a greenhouse soil (Sadamatsu et al 2008), and the cropping system (Minamikawa et al 2010) were important factors in determining indirect N 2 O emission through groundwater. In addition, the processes of N 2 O production, consumption, and transport in the subsoil and the groundwater are being clarified by analyzing stable isotope ratios of nitrate (NO À 3 ) and N 2 O; methods include a natural abundance method (e.g., Osaka et al 2010;Minamikawa et al 2011), a 15 N tracer method (e.g., Clough et al 1999;Van Groenigen et al 2005;Weymann et al 2009), and the measurement of the isotopomer signatures of N 2 O (e.g., Well et al 2005;Koba et al 2009).…”

Greenhouse gas emissions from saturated riparian buffers and woodchip bioreactors

“…Dissolved N2O concentrations in our study were wide ranging, from 0.1 to 981.1 µg L -1 . A large range of dissolved N2O concentrations has also been reported in other studies measuring dissolved N2O in drainage water Sawamoto et al, 2003;.…”