文献类型： 外文期刊
作者： Zheng, Xiangzhou 1 ; Guo, Baoling 1 ; Liu, Hongshan 1 ; Wu, Yiqun 1 ; Yu, Juhua 1 ; Ding, Hong 1 ; Jiang, Xiuhong 3 ; Luo, Quanda 4 ; Zhang, Yushu 1 ;
作者机构： 1.Fujian Acad Agr Sci, Fujian Key Lab Plant Nutr & Fertilizer, Inst Soil & Fertilizer, Fuzhou 350013, Peoples R China
2.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China
3.Fujian Inspect & Testing Ctr Agr Prod Qual & Safe, Fuzhou 350003, Peoples R China
4.Fujian Agr Ecol Environm & Energy Technol Ctr, Fuzhou 350003, Peoples R China
关键词： Nitrous oxide; Soil pH; nosZ; Gross N2O emission; N2O uptake; Net N2O flux
期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.536； 五年影响因子：3.821 ）
ISSN： 1439-0108
年卷期：
页码：
收录情况： SCI
摘要： Purpose Nitrous oxide (N2O) is an important greenhouse gas. Soils are the main source and an important sink of N2O. Gross rates of soil N2O emission and uptake determine the net flux and concentration of N2O in the atmosphere. Denitrification is generally considered a key pathway of N2O consumption, during which N2O is reduced to N-2 by nitrous oxide reductase (N2OR) encoded by nosZ genes. Although the soil pH is an important factor in denitrification, its effect on N2O uptake across the soil-atmosphere interface is still unclear. Materials and methods This study subjected acid red soil to eight different pH treatments (including 3.80, 4.47, 4.98, 6.08, 6.69, 6.99, 7.15, and 7.32) via lime application. An incubation experiment was conducted using a (N2O)-N-15 dilution technique to quantify soil gross N2O emission, N2O uptake, and net N2O flux. Results and discussion There are two contrasting gross N2O emission patterns in the tested pH range. When pH <= 4.98, the cumulative gross N2O emission decreased as the soil pH increased. In contrast, when pH > 4.98, the increasing pH promoted gross N2O emission. The significant positive correlation between gross N2O emission and net N2O flux indicated that the net flux of N2O is driven by gross emission rather than uptake. There was no observable effect on the cumulative N2O uptake in the 3.80-6.99 pH range, but it decreased at 7.15 and 7.32 pH. However, the copies of nosZ genes (both nosZ clades I and II) were inhibited at low pH and considerably increased with increasing soil pH. In addition, the cumulative N2O uptake/gross emission ratio was negatively correlated with soil pH. Conclusions Our findings show that low pH inhibits soil nosZ without affecting N2O uptake. However, this study provides direct evidence for N2O absorption across the atmospheric soil interface.
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