The effect of different N substrates on biological N2O production from forest and agricultural light textured soils |
| |
Authors: | Castaldi Simona Smith Keith A. |
| |
Affiliation: | (1) Soil Science Department, SAC, Italia;(2) Dipartimento di Scienze Ambientali, Seconda Università degli Studi di Napoli, via Arena 22, 81100 Caserta, Italia;(3) Present address: IERM, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JG, UK |
| |
Abstract: | N2O emissions from two slightly alkaline sandy soils, from arable land and a woodland, were determined in a laboratory experiment in which the soils were incubated with different sources of nitrogen, with or without glucose, and with 0, 1 and 100 mL C2H2 L-1. Large differences in the rate of N2O production were observed between the two soils and between the different N treatments. The arable soil showed very low N2O emissions derived from reduced forms of N as compared with the N2O which was produced when the soil was provided with NO2- or NO3- and a C source, suggesting a very active denitrifier population. In contrast, the woodland soil showed a very low denitrification activity and a much higher N2O production derived from the oxidation of NH4+ and reduction of NO2- by some processes probably mediated by autotrophic or heterotrophic nitrifiers or dissimilatory NO2- reducers. In both soils, the highest N2O emissions were induced by NO2- addition. Those emissions were demonstrated to have a biological origin, as no significant N2O emissions were measured when the soil was autoclaved. |
| |
Keywords: | acetylene denitrification nitrification N2O N sources |
本文献已被 SpringerLink 等数据库收录! |
|