Nitrogen deposition reduces methane uptake in both the growing and non-growing season in an alpine meadow

文献类型： 外文期刊

第一作者： Yan, Yulong

作者： Yan, Yulong;Yang, Jie;Wan, Zhiqiang;Yan, Yulong;Ganjurjav, Hasbagan;Hu, Guozheng;Gao, Qingzhu;Yang, Jie;Zou, Jiefu;Yan, Yulong;Liu, Guoping;Quan, Wei;Wen, Lin

作者机构：

关键词： Nitrogen deposition; Alpine meadow; Methane flux; Qinghai-Tibet Plateau

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 747 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) deposition-induced N input in alpine meadow soils may affect the soil exchange of methane (CH4) with the atmosphere. The quantities and spatiotemporal variation in CH4 uptake remain largely unknownfor this ecosystem on a global scale. Previous studies regarding CH4 flux have mainly focused on the growing season in alpine meadows. Thus, the impact of N deposition on the non-growing season uptake of CH4 is unknown. In this study, we investigated the effects of N deposition on CH4 uptake during both the growing and non-growing seasons in an alpine meadow on the central Qinghai-Tibet Plateau (QTP). The CH4 fluxes were measured using static chambers and gas chromatography in four N deposition treatment areas (Control; N7, 7 kg N ha(-1) yr(-1); N20, 20 kg N ha(-1) yr(-1); N40, 40 kg N ha(-1) yr(-1)) fromMay 2015 to August 2018. Our results showed that alpine meadowsoils acted as CH4 sinks throughout the year. N deposition significantly decreased CH4 uptake fluxes (P < 0.05) and the annual mean CH4 uptake fluxes declined at N deposition levels of 7, 20, and 40 kg N ha(-1) yr(-1) by 12.3%, 14.4%, and 20.5%, respectively, comparedwith that of the control. Annual CH4 uptake was significantly correlated with total annual precipitation, mean annual air temperature, and N deposition rate. Annual cumulative CH4 uptake in the four treatments across 3 years was 75.1 mg C m(-2), where approximately 40% of the total annual CH4 uptake occurred during the non-growing season. Our results showed that CH4 uptake in the non-growing season cannot be ignored when estimating annual uptake of CH4 because of the large CH4 uptake during the non-growing season in the alpine meadow on the QTP under N deposition conditions. (C) 2020 Elsevier B.V. All rights reserved.

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