High-Resolution Denitrification Kinetics in Pasture Soils Link N2O Emissions to pH, and Denitrification to C Mineralization

被引:62
|
作者
Samad, Md Sainur [1 ]
Bakken, Lars R. [2 ]
Nadeem, Shahid [2 ]
Clough, Timothy J. [3 ]
de Klein, Cecile A. M. [4 ]
Richards, Karl G. [5 ]
Lanigan, Gary J. [5 ]
Morales, Sergio E. [1 ]
机构
[1] Univ Otago, Otago Sch Med Sci, Dept Microbiol & Immunol, Dunedin, New Zealand
[2] Norwegian Univ Life Sci, Dept Environm Sci, As, Norway
[3] Lincoln Univ, Dept Soil & Phys Sci, Lincoln, New Zealand
[4] AgRes Invermay, Mosgiel, New Zealand
[5] TEAGASC, Environm Res Ctr, Johnstown Castle, Wexford, Ireland
来源
PLOS ONE | 2016年 / 11卷 / 03期
关键词
NITROUS-OXIDE; PRODUCT RATIO; NO; ACIDIFICATION; COMMUNITIES;
D O I
10.1371/journal.pone.0151713
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Denitrification in pasture soils is mediated by microbial and physicochemical processes leading to nitrogen loss through the emission of N2O and N-2. It is known that N2O reduction to N-2 is impaired by low soil pH yet controversy remains as inconsistent use of soil pH measurement methods by researchers, and differences in analytical methods between studies, undermine direct comparison of results. In addition, the link between denitrification and N2O emissions in response to carbon (C) mineralization and pH in different pasture soils is still not well described. We hypothesized that potential denitrification rate and aerobic respiration rate would be positively associated with soils. This relationship was predicted to be more robust when a high resolution analysis is performed as opposed to a single time point comparison. We tested this by characterizing 13 different temperate pasture soils from northern and southern hemispheres sites (Ireland and New Zealand) using a fully automated-high-resolution GC detection system that allowed us to detect a wide range of gas emissions simultaneously. We also compared the impact of using different extractants for determining pH on our conclusions. In all pH measurements, soil pH was strongly and negatively associated with both N2O production index (IN2O) and N2O/(N2O+N-2) product ratio. Furthermore, emission kinetics across all soils revealed that the denitrification rates under anoxic conditions (NO+N2O+N-2 mu mol N/h/vial) were significantly associated with C mineralization (CO2 mu mol/h/vial) measured both under oxic (r(2) = 0.62, p = 0.0015) and anoxic (r(2) = 0.89, p<0.0001) conditions.
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页数:11
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