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Nitrous oxide production pathways in Australian forest soils

文献类型： 外文期刊

作者： Pan, Baobao 1 ; Zhang, Yushu 1 ; Xia, Longlong 3 ; Lam, Shu Kee 1 ; Hu, Hang-Wei 1 ; Chen, Deli 1 ;

作者机构： 1.Univ Melbourne, Fac Vet & Agr Sci, Sch Agr & Food, Melbourne, Vic 3010, Australia

2.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Peoples R China

3.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, IMK IFU, D-82467 Garmisch Partenkirchen, Germany

关键词： Australian forest soil; N2O production pathway; Organic nitrogen (N) pool

期刊名称：GEODERMA （ 影响因子：7.422； 五年影响因子：7.444 ）

ISSN： 0016-7061

年卷期： 2022 年 420 卷

页码：

收录情况： SCI

摘要： Forest soils are a major source of N2O emissions from terrestrial ecosystems. However, the magnitude and contribution of N2O production from different pathways in Australian forest soils remain uncertain. We conducted a N-15 tracing laboratory incubation experiment on 13 forest soils sampled from subtropical, temperate and arid regions across Australia and found that forest soils in temperate areas had the highest N2O emission rate (19.5 mu g N kg-1 soil d-1), followed by subtropical and arid soils (3.84 and 3.80 mu g N kg-(-1)soil d(-1), respectively). N2O production in Australian forest soils was mainly derived from the organic nitrogen (N) pool; its contribution followed the order of arid (78%) > subtropical (69%) > temperate (59%). N2O emission potentially from heterotrophic nitrification was negatively correlated with latitude (p < 0.05) and the contribution of soil organic N to N2O production was negatively correlated with soil total N and total carbon (C) content (p < 0.01). Our study improves the understanding of N2O production pathways from warm arid to cool temperate regions in Australian forest soils.

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