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.
机构:
Johann Heinrich von Thunen Inst, Inst Agr Climate Res, D-38116 Braunschweig, Germany
Univ Gottingen, Busgen Inst, Gottingen, GermanyJohann Heinrich von Thunen Inst, Inst Agr Climate Res, D-38116 Braunschweig, Germany
Well, R.
Flessa, H.
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Johann Heinrich von Thunen Inst, Inst Agr Climate Res, D-38116 Braunschweig, GermanyJohann Heinrich von Thunen Inst, Inst Agr Climate Res, D-38116 Braunschweig, Germany
机构:
Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
Guangzhou Univ, Minist Educ, Inst Environm Res Greater Bay Area, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou, Peoples R China
Univ Chinese Acad Sci, Beijing, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
Xiang, Hua
Hong, Yiguo
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Guangzhou Univ, Minist Educ, Inst Environm Res Greater Bay Area, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
Hong, Yiguo
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Wu, Jiapeng
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Wang, Yu
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Ye, Fei
Ye, Jiaqi
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Guangzhou Univ, Minist Educ, Inst Environm Res Greater Bay Area, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
Ye, Jiaqi
Lu, Jing
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Guangzhou Univ, Minist Educ, Inst Environm Res Greater Bay Area, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
Lu, Jing
Long, Aimin
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Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
Univ Chinese Acad Sci, Beijing, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China