| 模拟氮沉降对藏北高寒草甸温室气体排放的影响 |
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| 引用本文： | 梁艳,干珠扎布,曹旭娟,张伟娜,张勇,栗文瀚,高清竹,万运帆,李玉娥,旦久罗布,何世丞.模拟氮沉降对藏北高寒草甸温室气体排放的影响[J].生态学报,2017,37(2):485-494. |
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| 作者姓名： | 梁艳 干珠扎布 曹旭娟 张伟娜 张勇 栗文瀚 高清竹 万运帆 李玉娥 旦久罗布 何世丞 |
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| 作者单位： | 中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,北京师范大学环境学院, 北京 100875,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,中国农业科学院农业环境与可持续发展研究所, 北京 100081;农业部农业环境与气候变化重点实验室, 北京 100081,西藏自治区那曲地区草原站, 那曲 852100,西藏自治区那曲地区草原站, 那曲 852100 |
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| 基金项目： | 国家自然科学基金项目（31170460）；西藏那曲地区与中国农业科学院合作项目 |
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| 摘 要： | 目前,高寒草甸对全球温室效应的贡献仍具有不确定性,而随着N沉降的增加,该系统温室体气排放也必将发生变化。为揭示高寒草甸对N沉降的响应机制,探讨其对全球变化的反馈作用,利用人工添加氮素的方法,于2014年生长季(6-9月)在那曲地区那曲县设置不同水平N添加梯度(0、7、20kg hm~(-2)a~(-1)和40 kg hm~(-2)a~(-1)),模拟氮沉降增加对藏北高寒草甸温室气体排放的影响。经过1a的研究结果表明:1)施氮显著促进了CO_2排放但对CH_4的吸收和N_2O的排放无显著影响。总体而言,添加氮素明显增加了温室气体排放总量,其中N2O处理下高寒草甸温室气体排放总量最高。2)回归分析结果表明,CO_2与NPP(总生物量)和TOC(土壤有机碳)线性相关(P0.05),而与TN(总氮)、NH_4~+-N和NO_3~--N均无显著相关关系(P0.05),CH_4与TN/NPP/TOC/NH_4~+-N/NO_3~--N均不相关(P0.05),N_2O与NPP/TOC/NO_3~--N均显著线性相关(P0.05),而与TN/NH_4~+-N不相关。综合初步研究结果,未来氮沉降增加条件下,藏北高寒草甸温室气体排放通量将有可能明显增加,从而对气候变化产生重要的反馈作用。
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| 关 键 词： | 氮沉降 高寒草甸 温室气体 土壤养分 生物量 |
| 收稿时间： | 2015/8/4 0:00:00 |
| 修稿时间： | 2016/5/12 0:00:00 |
Effects of simulated nitrogen deposition on greenhouse gas emissions from alpine meadows in northern Tibet |
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| LIANG Yan,HASBAGAN Ganjurjav,CAO Xujuan,ZHANG Wein,ZHANG Yong,LI Wenhan,GAO Qingzhu,WAN Yunfan,LI Yu''e,DANJIU Luobu and He Shicheng.Effects of simulated nitrogen deposition on greenhouse gas emissions from alpine meadows in northern Tibet[J].Acta Ecologica Sinica,2017,37(2):485-494. |
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| Authors: | LIANG Yan HASBAGAN Ganjurjav CAO Xujuan ZHANG Wein ZHANG Yong LI Wenhan GAO Qingzhu WAN Yunfan LI Yu'e DANJIU Luobu and He Shicheng |
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| Institution: | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,School of Environment, Beijing Normal University, Beijing 100875, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing 100081, China,Nagqu Grassland Station, Nagqu 852100, China and Nagqu Grassland Station, Nagqu 852100, China |
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| Abstract: | The alpine meadow is the largest and most important ecosystem in northern Tibet. Recently, nitrogen deposition in Tibet has had a profound impact on carbon and nitrogen cycles in grassland ecosystems. To assess the impact of nitrogen deposition on greenhouse gas emissions from alpine meadows in northern Tibet, we conducted a nitrogen fertilizing experiment, using four fertilizing levels of 0, 7, 20, and 40 kg hm-2 a-1, in Nagqu County in the growing season in 2014. Our results showed that the impact on greenhouse gas emission varied with different levels of nitrogen deposition. Regarding daily variation, nitrogen significantly enhanced CO2 emission but had no effect on the absorption of CH4, or the emission of N2O. Overall, nitrogen deposition significantly increased greenhouse gas emissions. The highest emission occurred with the N20 treatment, and there was a positive correlation among CO2, net primary productivity (NPP), and total organic carbon (TOC) (P < 0.05). The total nitrogen (TN), NH4+-N, and NO3--N were not correlated with CO2 (P > 0.05), and the same pattern was observed in the relationship between CH4 and TN/NPP/TOC/NH4+-N/NO3-N (P > 0.05). N2O levels showed a significant linear correlation with NPP/TOC/NO3-N (P < 0.05), but were not correlated with TN/NH4+-N (P > 0.05). With additional nitrogen deposition expected in the future, greenhouse gas emissions would increase significantly and have a positive or negative feedback on climate change in Northern Tibet. |
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| Keywords: | nitrogen deposition alpine meadow greenhouse gas soil nutrients biomass |
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