The influence of soluble carbon and fertilizer nitrogen on nitric oxide and nitrous oxide emissions from two contrasting agricultural soils

被引:123
作者
Sanchez-Martin, Laura
Vallejo, Antonio
Dick, Jan
Skiba, Ute M.
机构
[1] Univ Politecn Madrid, Dept Agr Chem, E-28040 Madrid, Spain
[2] Ctr Ecol & Hydrol, Penicuik EH26 QB, Midlothian, Scotland
基金
英国自然环境研究理事会;
关键词
nitrous oxide; nitric oxide; soil respiration; mineral N; glucose; soil moisture; mitigation;
D O I
10.1016/j.soilbio.2007.07.016
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Contradictory effects of simultaneous available organic C and N sources on nitrous oxide (N2O), carbon dioxide (CO2) and nitric oxide (NO) fluxes are reported in the literature. in order to clarify this controversy, laboratory experiments were conduced on two different soils, a semiarid arable soil from Spain (soil 1, pH = 7.5 0.8%C) and a grassland soil from Scotland (soil 11, pH = 5.5 4.1 %C). Soils were incubated at two different moisture contents, at a water filled pore space (WFPS) of 90% and 40%. Ammonium sulphate, added at rates equivalent to 200 and 50 kg N ha(-1), stimulated N2O and NO emissions in both soils. Under wet conditions (90% WFPS), at high and low rates of N additions, cumulative NO emissions increased by 250.7 and 8.1 ng N2O-Ng(-1) in comparison to the control, respectively,. in soil I and by 472.2 and 2.1 ng N2O-Ng(-1), respectively,in soil II. NO emissions only significantly increased in soil I at the high N application rate with and without glucose addition and at both 40% and 90% WHIS. In both soils additions of glucose together with the high N application rate (200 kg N ha(-1)) reduced Cumulative N2O and NO emissions by 94% and 55% in soil I. and by 46% and 66% in soil 11, respectively. These differences can be explained by differences in soil properties, including pH, soil mineral N and total and dissolved organic carbon content. It is speculated that nitrifier denitrification was the main source of NO and N2O in the C-poor Spanish soil, and coupled nitrification-denitrification in the C-rich Scottish soil. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:142 / 151
页数:10
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