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. 2014 Apr 8;20(5):1685–1698. doi: 10.1111/gcb.12461

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© 2013 John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Relationship between soil pH and N₂O production index in the liming experiment. The four soils limed were peat soil from Fjaler (Norway) with pH = 4 (F4), peat soil from Fjaler with pH with pH = 6 (F6), the Shouguang soil (SG) and the Qiyang soil (QY). The lines connect the results for limed (open symbols) and unlimed (closed symbols) for each soil and treatment (solid lines: no glutamate added, dashed lines: glutamate added). For the mineral soils (QY and SG), the indexes () were calculated for the time period from 0 to T (Eqn 1), where T is the time when 100 nmol NO₃−N g⁻¹ soil had been recovered as (NO+N₂O+N₂)−N. For the peat soils (F4 and F6), the indexes () were calculated for T = the time when 3000 nmol NO₃−N g⁻¹ soil had been recovered as (NO+N₂O+N₂)-N.

Inline graphic — Relationship between soil pH and N₂O production index in the liming experiment. The four soils limed were peat soil from Fjaler (Norway) with pH = 4 (F4), peat soil from Fjaler with pH with pH = 6 (F6), the Shouguang soil (SG) and the Qiyang soil (QY). The lines connect the results for limed (open symbols) and unlimed (closed symbols) for each soil and treatment (solid lines: no glutamate added, dashed lines: glutamate added). For the mineral soils (QY and SG), the indexes () were calculated for the time period from 0 to T (Eqn 1), where T is the time when 100 nmol NO₃−N g⁻¹ soil had been recovered as (NO+N₂O+N₂)−N. For the peat soils (F4 and F6), the indexes () were calculated for T = the time when 3000 nmol NO₃−N g⁻¹ soil had been recovered as (NO+N₂O+N₂)-N.