Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 456188
Title N2O consumption by low-nitrogen soil and its regulation by water and oxygen
Author(s) Wu, D.M.; Dong, W.X.; Oenema, O.; Wang, Y.Y.; Trebs, I.; Hu, C.S.
Source Soil Biology and Biochemistry 60 (2013). - ISSN 0038-0717 - p. 165 - 172.
Department(s) Alterra - Sustainable soil management
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) spruce forest soil - aerobic denitrification - oxide - fluxes - emissions - exchange - n-2 - no - bacteria - nitrate
Abstract Soils can be a source and sink for atmospheric nitrous oxide (N2O). Consumption of N2O has been reported for anoxic soils and sediments rich in organic matter and depleted in nitrates (NO3-), and also for some dry, oxic soils. However, the mechanisms and controls of N2O consumption in dry soil are not clear. Here, we report on a field study in China (Taihang mountain region, Shijiazhuang), in which N2O uptake by a sandy loam soil was measured for the greater part of the season (from April to October in 2011), and on four incubation experiments, in which we tried to reveal the roles of water content and oxygen (O-2) concentrations on N2O consumption. Flux measurements in the field were made bi-weekly on unfertilized cropped land with static flux chambers (5 replicates) for 6 months. The results show that N2O-N fluxes ranged from -26.0 to -726.6 mu g m(-2) h(-1). Consumption of N2O was largest when the soil was dry (5-20% soil water filled pore space). In the incubation experiments, N2O consumption and N-2 production were measured in (an)aerobic soil with soil moisture content ranging from 1% to 50% (wt/wt) and with N2O addition, using a thermostatic, robotized incubation system. Under anaerobic conditions, N2O was rapidly consumed at water content of >10% (wt/wt). However, a significant consumption also occurred at 1% soil moisture. Under aerobic conditions, N2O consumption increased with increasing soil moisture content, but significant consumption was still measured at 2% moisture. Sterilization of oxic soil completely blocked N2O consumption, suggesting that the consumption had a biological nature. In conclusion, the steady N2O consumption measured in the field was confirmed by the laboratory experiments, but the relationship with soil moisture content was reversed. Further studies are required to understand this apparent anomaly.
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