Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau

	Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau
	Fang, Huajun ; Cheng, Shulan ; Yu, Guirui ; Cooch, Jules ; Wang, Yongsheng ; Xu, Minjie ; Li, Linsen ; Dang, Xusheng ; Li, Yingnian
刊名	GEODERMA ; Fang, HJ; Cheng, SL; Yu, GR; Cooch, J; Wang, YS; Xu, MJ; Li, LS; Dang, XS; Li, YN.Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau,GEODERMA,2014,213():444
	2014
英文摘要	It is crucial to understand the effects of enhanced nitrogen (N) deposition on soil methane (CH4) uptake to develop a better comprehension of carbon (C) dynamics in terrestrial ecosystems. A two-year field study was conducted to assess the effects of various forms of N (NH4+ and N-3(-)) and associated N deposition rates (0, 10,20 and 40 kg N ha(-1) yr(-1)) on alpine meadow soil CH4 fluxes on the Qinghai-Tibetan Plateau, China. Soil CH4 fluxes, soil temperature, and soil moisture were monitored weekly using the static chamber technique and gas chromatography. Soil inorganic N pools, soil pH and aboveground biomass were measured monthly to examine the key controlling factors of soil CH4 flux. Our results showed that N addition significantly promoted plant growth and changed soil water-filled pore space (WFPS), but did not alter soil inorganic N storages over the short term. Low rates of N addition significantly decreased the seasonal amount of CH4 uptake by 8.6% compared with the control. Soil CH4 fluxes were mainly determined by soil WFPS, followed by inorganic N availability. N addition increased the contribution of soil WFPS, pH and soil NO3- storage. The observed reduction in CH4 uptake caused by N addition may be largely due to a decrease in physical diffusion, as the biochemical inhibition effects on methanotrophic bacteria are minor. These results suggest that soil inorganic N is a regulatory factor of soil CH4 uptake, and its promotion or inhibition to soil CH4 uptake depends on the N status in terrestrial ecosystems. (C) 2013 Elsevier B.V. All rights reserved.; It is crucial to understand the effects of enhanced nitrogen (N) deposition on soil methane (CH4) uptake to develop a better comprehension of carbon (C) dynamics in terrestrial ecosystems. A two-year field study was conducted to assess the effects of various forms of N (NH4+ and N-3(-)) and associated N deposition rates (0, 10,20 and 40 kg N ha(-1) yr(-1)) on alpine meadow soil CH4 fluxes on the Qinghai-Tibetan Plateau, China. Soil CH4 fluxes, soil temperature, and soil moisture were monitored weekly using the static chamber technique and gas chromatography. Soil inorganic N pools, soil pH and aboveground biomass were measured monthly to examine the key controlling factors of soil CH4 flux. Our results showed that N addition significantly promoted plant growth and changed soil water-filled pore space (WFPS), but did not alter soil inorganic N storages over the short term. Low rates of N addition significantly decreased the seasonal amount of CH4 uptake by 8.6% compared with the control. Soil CH4 fluxes were mainly determined by soil WFPS, followed by inorganic N availability. N addition increased the contribution of soil WFPS, pH and soil NO3- storage. The observed reduction in CH4 uptake caused by N addition may be largely due to a decrease in physical diffusion, as the biochemical inhibition effects on methanotrophic bacteria are minor. These results suggest that soil inorganic N is a regulatory factor of soil CH4 uptake, and its promotion or inhibition to soil CH4 uptake depends on the N status in terrestrial ecosystems. (C) 2013 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://210.75.249.4/handle/363003/4291]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Fang, Huajun,Cheng, Shulan,Yu, Guirui,et al. Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau[J]. GEODERMA, Fang, HJ; Cheng, SL; Yu, GR; Cooch, J; Wang, YS; Xu, MJ; Li, LS; Dang, XS; Li, YN.Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau,GEODERMA,2014,213():444,2014.
APA	Fang, Huajun.,Cheng, Shulan.,Yu, Guirui.,Cooch, Jules.,Wang, Yongsheng.,...&Li, Yingnian.(2014).Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau.GEODERMA.
MLA	Fang, Huajun,et al."Low-level nitrogen deposition significantly inhibits methane uptake from an alpine meadow soil on the Qinghai-Tibetan Plateau".GEODERMA (2014).