Mechanisms of N2O and NO production in the soil profile of a drained and forested peatland, as studied with acetylene, nitrapyrin and dimethyl ether |
| |
Authors: | K Regina J Silvola P J Martikainen |
| |
Institution: | (1) Laboratory of Environmental Microbiology, National Public Health Institute, POB 95, FIN-70701 Kuopio, Finland Tel.: +358-17-201211; Fax: +358-17-201155; e-mail: Pertti.Martikainen@ktl.fi, FI;(2) Department of Biology, University of Joensuu, POB 111, FIN-80101, Joensuu, Finland, FI |
| |
Abstract: | Acetylene, dimethyl ether (DME) and 2-chloro-6-trichloromethyl pyridine (nitrapyrin) were used as inhibitors to study the
contributions of nitrification and denitrification to the production of N2O and nitric oxide (NO) in samples taken from the soil profile of a peatland drained for forestry. Acetylene and DME inhibited
60–100% of the nitrification activity in field-moist samples from the 0–5 cm and 5–10 cm peat layers, whereas nitrapyrin had
no inhibitory effect. In the 0–5 cm peat layer the N2O production could be reduced by up to 90% with inhibitors of nitrification, but in the 5–10 cm peat layer this proportion
was 20–30%. All the inhibitors removed 96–100% of the nitrification potential in peat-water slurries from the 0–5 cm peat
layer, but the 5–10 cm layer had a much lower nitrification activity, and here the efficiency of the inhibitors was more variable.
Litter was the main net source of NO in the peat profile. NO3
– production was lower in the litter layer than in the peat, whereas N2O production was much higher in the litter than in the peat. Denitrification was the most probable source of N2O and NO in the litter, which had a high availability of organic substrates.
Received: 14 July 1997 |
| |
Keywords: | Nitrous oxide Nitric oxide Organic soil Nitrification Inhibitors |
本文献已被 SpringerLink 等数据库收录! |
|