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Land-use type affects N2O production pathways in subtropical acidic soils

文献类型： 外文期刊

作者： Zhang, Yushu 1 ; Ding, Hong 1 ; Zheng, Xiangzhou 1 ; Ren, Xiangyun 2 ; Cardenas, Laura 3 ; Carswell, Alison 3 ; Missel 1 ;

作者机构： 1.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Fujian, Peoples R China

2.Fujian Acad Agr Sci, Inst Agr Engn Technol, Fuzhou 350013, Fujian, Peoples R China

3.Rothamsted Res, Sustainable Agr Sci, North Wyke EX20 2SB, Devon, England

关键词： Nitrous oxide; Heterotrophic nitrification; Autotrophic nitrification; Denitrification; N-15; Stable isotope

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2018 年 237 卷

页码：

收录情况： SCI

摘要： The change in land-use from woodland to crop production leads to increased nitrous oxide (N2O) emissions. An understanding of the main N2O sources in soils under a particular land can be a useful tool in developing mitigation strategies. To better understand the effect of land-use on N2O emissions, soils were collected from 5 different land-uses in southeast China: shrub land (SB), eucalyptus plantation (ET), sweet potato farmland (SP), citrus orchard (CO) and vegetable growing farmland (VE). A stable isotope experiment was conducted incubating soils from the different land use types at 60% water holding capacity (WHC), using (NH4NO3)-N-15 and (NH4NO3)-N-15 to determine the dominant N2O production pathway for the different land-uses. The average N2O emission rates for VE, CO and SP were 5.30, 4.23 and 3.36 mu g N kg(-1) dry soil d(-1), greater than for SB and ET at 0.98 and 1.10 mu g N kg(-1) dry soil respectively. N2O production was dominated by heterotrophic nitrification for SB and ET, accounting for 51 and 50% of N2O emissions, respectively. However, heterotrophic nitrification was negligible (<8%) in SP, CO and VE, where autotrophic nitrification was a primary driver of N2O production, accounting for 44, 45 and 66% for SP, CO and VE, respectively. Denitrification was also an important pathway of N2O production across all land-uses, accounting for 35, 35, 49, 52 and 32% for SB, ET, SP, CO and VE respectively. Average N2O emission rates via autotrophic nitrification, denitrification and heterotrophic nitrification increased significantly with gross nitrification rates, NO3 contents and C:N ratios respectively, indicating that these were important factors in the N2O production pathways for these soils. These results contribute to our understanding and ability to predict N2O emissions from different land-uses in subtropical acidic soils and in developing potential mitigation strategies. (C) 2018 Elsevier Ltd. All rights reserved.

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