文献类型： 外文期刊

作者： Cheng, Yi ¹ ; Zhang, Huimin ¹ ; Chen, Zhaoxiong ¹ ; Wang, Jing ² ; Cai, Zejiang ⁴ ; Sun, Nan ⁴ ; Wang, Shenqiang ⁶ ; Zhan ¹ ;

作者机构： 1.Nanjing Normal Univ, Sch Geog, Nanjing 210023, Peoples R China

2.Nanjing Forestry Univ, Coll Forestry, Nanjing, Peoples R China

3.Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing, Peoples R China

4.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Engn Lab Improving Qual Arable Land, Beijing, Peoples R China

5.Chinese Acad Agr Sci, Qiyang Agroecosyst Natl Field Expt Stn, Qiyang, Hunan, Peoples R China

6.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing, Peoples R China

7.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing, Peoples R China

8.State Key Lab Cultivat Base Geog Environm Evolut, Nanjing, Peoples R China

9.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou, Peoples R China

10.Univ Alberta, Dept Renewable Resources, Edmonton, AB, Canada

11.Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany

12.Univ Coll Dublin, Sch Biol & Environm Sci, Belfield, Ireland

13.Univ Coll Dublin, Earth Inst, Belfield, Ireland

关键词： N-15 tracing; denitrification; N2O emissions; nitrification; quicklime; soil acidification

期刊名称：EUROPEAN JOURNAL OF SOIL SCIENCE （ 影响因子：4.949； 五年影响因子：4.626 ）

ISSN： 1351-0754

年卷期：

页码：

收录情况： SCI

摘要： Acidic soils, occupying ca. 40% of the world's arable soils, often need to be managed (e.g., to raise their pH and to improve crop productivity); however, the environmental impact of raising soil pH is often difficult to assess. Increasing soil pH stimulates the reduction of N2O to N-2, thus lowering N2O emissions associated with denitrification, but can also increase autotrophic nitrification rates and related N2O emission. Using a N-15 tracing technique, we provide process-based insights into the effects of two acid-neutralizing materials (quicklime [CaO] vs. pig manure) on N2O emissions in an acidified upland soil that had experienced excessive N application. Without pH adjustments we found that N2O emissions, stimulated by supply of reactive N, were related to denitrification- and heterotrophic nitrification-derived N2O emissions, whereas autotrophic nitrification-derived N2O emissions declined with decreasing soil pH. These effects were reversed by increasing soil pH via liming. However, increasing the soil pH via application of pig manure significantly increased soil N2O emissions from both nitrification and denitrification. Our study highlights that pH-amelioration practices may enhance N2O emissions depending on the type of material applied to the soil. Therefore, both pH remediation and greenhouse gas mitigation options need to be considered together to avoid adverse environmental effects. The effect of different acid-neutralizing materials on soil N2O emissions should be incorporated into ecosystem models to better estimate global N2O emissions when pH amelioration is practised. Highlights Enhanced N2O emission by N input was from denitrification and heterotrophic nitrification. Chemical N input and liming have reversible effects on N2O emission. Soil N2O emission was decreased by liming but increased by animal manure input. Careful consideration of pH raising substrates is needed to avoid adverse effects.