Bowen Zhang , Minghua Zhou , Bo Zhu , Björn Kemmann , Lisa Pfülb , Stefan Burkart , Hongbin Liu , Klaus Butterbach-Bahl , Reinhard Well
{"title":"土壤NO3−浓度对反硝化产物N2O/（N2O+N2）比值的阈值效应由土壤pH介导","authors":"Bowen Zhang , Minghua Zhou , Bo Zhu , Björn Kemmann , Lisa Pfülb , Stefan Burkart , Hongbin Liu , Klaus Butterbach-Bahl , Reinhard Well","doi":"10.1016/j.soilbio.2023.109213","DOIUrl":null,"url":null,"abstract":"<div><p>The interactive effects of soil pH and nitrate (NO<sub>3</sub><sup>−</sup>) availability on denitrification-derived nitrous oxide (N<sub>2</sub>O) and dinitrogen (N<sub>2</sub>) emissions, as well as N<sub>2</sub>O/(N<sub>2</sub>O + N<sub>2</sub>) product ratio (N<sub>2</sub>Oi) remain difficult to evaluate. Here, we consecutively monitored denitrification-derived N<sub>2</sub>O and N<sub>2</sub> emissions with different soil pH and NO<sub>3</sub><sup>−</sup> concentrations by using the artificial <sup>15</sup>N gas flux method in combination with a global meta-analysis of 458 observations to illustrate the interactive effects of soil pH and NO<sub>3</sub><sup>−</sup> availability on N<sub>2</sub>Oi. Isotopic data indicated that pH adjustment through liming significantly and nonlinearly reduced N<sub>2</sub>Oi and increased cumulative N<sub>2</sub> emissions. Liming decreased cumulative N<sub>2</sub>O emissions by approximately threefold in low NO<sub>3</sub><sup>−</sup> treatments (<em>p</em> < 0.01), while at high NO<sub>3</sub><sup>−</sup> treatments liming showed no effect. The meta-analysis revealed a logarithmic relationship between N<sub>2</sub>Oi and increasing soil NO<sub>3</sub><sup>−</sup> concentrations across different soil pH levels, indicating a threshold-like effect of NO<sub>3</sub><sup>−</sup> concentrations on the reduction of N<sub>2</sub>O during denitrification. The threshold NO<sub>3</sub><sup>−</sup> concentration tends to raise with increasing soil pH. Hence, there were significant interaction effects of soil pH and soil NO<sub>3</sub><sup>−</sup> concentration on the N<sub>2</sub>Oi value. The present study emphasizes the need to consider soil pH and NO<sub>3</sub><sup>−</sup> concentration interaction effects on denitrification for proposing the effective mitigation practices of denitrification-derived soil N<sub>2</sub>O emissions.</p></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"187 ","pages":"Article 109213"},"PeriodicalIF":9.8000,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Threshold-like effect of soil NO3− concentrations on denitrification product N2O/(N2O+N2) ratio is mediated by soil pH\",\"authors\":\"Bowen Zhang , Minghua Zhou , Bo Zhu , Björn Kemmann , Lisa Pfülb , Stefan Burkart , Hongbin Liu , Klaus Butterbach-Bahl , Reinhard Well\",\"doi\":\"10.1016/j.soilbio.2023.109213\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The interactive effects of soil pH and nitrate (NO<sub>3</sub><sup>−</sup>) availability on denitrification-derived nitrous oxide (N<sub>2</sub>O) and dinitrogen (N<sub>2</sub>) emissions, as well as N<sub>2</sub>O/(N<sub>2</sub>O + N<sub>2</sub>) product ratio (N<sub>2</sub>Oi) remain difficult to evaluate. Here, we consecutively monitored denitrification-derived N<sub>2</sub>O and N<sub>2</sub> emissions with different soil pH and NO<sub>3</sub><sup>−</sup> concentrations by using the artificial <sup>15</sup>N gas flux method in combination with a global meta-analysis of 458 observations to illustrate the interactive effects of soil pH and NO<sub>3</sub><sup>−</sup> availability on N<sub>2</sub>Oi. Isotopic data indicated that pH adjustment through liming significantly and nonlinearly reduced N<sub>2</sub>Oi and increased cumulative N<sub>2</sub> emissions. Liming decreased cumulative N<sub>2</sub>O emissions by approximately threefold in low NO<sub>3</sub><sup>−</sup> treatments (<em>p</em> < 0.01), while at high NO<sub>3</sub><sup>−</sup> treatments liming showed no effect. The meta-analysis revealed a logarithmic relationship between N<sub>2</sub>Oi and increasing soil NO<sub>3</sub><sup>−</sup> concentrations across different soil pH levels, indicating a threshold-like effect of NO<sub>3</sub><sup>−</sup> concentrations on the reduction of N<sub>2</sub>O during denitrification. The threshold NO<sub>3</sub><sup>−</sup> concentration tends to raise with increasing soil pH. Hence, there were significant interaction effects of soil pH and soil NO<sub>3</sub><sup>−</sup> concentration on the N<sub>2</sub>Oi value. The present study emphasizes the need to consider soil pH and NO<sub>3</sub><sup>−</sup> concentration interaction effects on denitrification for proposing the effective mitigation practices of denitrification-derived soil N<sub>2</sub>O emissions.</p></div>\",\"PeriodicalId\":21888,\"journal\":{\"name\":\"Soil Biology & Biochemistry\",\"volume\":\"187 \",\"pages\":\"Article 109213\"},\"PeriodicalIF\":9.8000,\"publicationDate\":\"2023-10-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Soil Biology & Biochemistry\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0038071723002754\",\"RegionNum\":1,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"SOIL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Soil Biology & Biochemistry","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0038071723002754","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"SOIL SCIENCE","Score":null,"Total":0}
Threshold-like effect of soil NO3− concentrations on denitrification product N2O/(N2O+N2) ratio is mediated by soil pH
The interactive effects of soil pH and nitrate (NO3−) availability on denitrification-derived nitrous oxide (N2O) and dinitrogen (N2) emissions, as well as N2O/(N2O + N2) product ratio (N2Oi) remain difficult to evaluate. Here, we consecutively monitored denitrification-derived N2O and N2 emissions with different soil pH and NO3− concentrations by using the artificial 15N gas flux method in combination with a global meta-analysis of 458 observations to illustrate the interactive effects of soil pH and NO3− availability on N2Oi. Isotopic data indicated that pH adjustment through liming significantly and nonlinearly reduced N2Oi and increased cumulative N2 emissions. Liming decreased cumulative N2O emissions by approximately threefold in low NO3− treatments (p < 0.01), while at high NO3− treatments liming showed no effect. The meta-analysis revealed a logarithmic relationship between N2Oi and increasing soil NO3− concentrations across different soil pH levels, indicating a threshold-like effect of NO3− concentrations on the reduction of N2O during denitrification. The threshold NO3− concentration tends to raise with increasing soil pH. Hence, there were significant interaction effects of soil pH and soil NO3− concentration on the N2Oi value. The present study emphasizes the need to consider soil pH and NO3− concentration interaction effects on denitrification for proposing the effective mitigation practices of denitrification-derived soil N2O emissions.
期刊介绍：
Soil Biology & Biochemistry publishes original research articles of international significance focusing on biological processes in soil and their applications to soil and environmental quality. Major topics include the ecology and biochemical processes of soil organisms, their effects on the environment, and interactions with plants. The journal also welcomes state-of-the-art reviews and discussions on contemporary research in soil biology and biochemistry.
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