Research on the Methane Emission and Carbon Isotope of Permafrost Wetland in Qinghai-Tibet Plateau

doi:10.19657/j.geoscience.1000-8527.2018.05.22

Abstract

Abstract:

As one of the most important wetland area component, carbon cycle in Qinghai-Tibet Plateau plays a critical role in the terrestrial ecosystem. For systematically studying the methane emission of permafrost wetland in Qinghai-Tibet Plateau, by using the chamber method, we made a field measurement on the methane carbon isotope. Furthermore, combining with the adsorbed gas chromatography result, we conducted the gas source discrimination. The results show that the soil methane emission is the highest and mainly on biogenic source in spring. In summer, methane of soil emission is mainly on mixed-genetic source. In autumn, the soil methane emission is the lowest and mainly on thermo genic gas. The biological action is the main influence factor of methane emission. Meanwhile, the gas escaped from the natural gas hydrate underground also influenced the atmospheric methane content to some extent.

Key words: Qinghai-Tibet Plateau, methane emission, methane carbon isotope, natural gas hydrate

CLC Number:

P595
P618.1

ZHANG Shunyao, YANG Fan, ZHANG Fugui, SHI Zeming, YANG Zhibin, ZHOU Yalong, WANG Huiyan. Research on the Methane Emission and Carbon Isotope of Permafrost Wetland in Qinghai-Tibet Plateau[J]. Geoscience, 2018, 32(05): 1089-1096.

Figures/Tables 5

References 87

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	5月份实验数据			8月份实验数据			10月份实验数据
	δ¹³C₁/ ‰	T-CH₄/ (μL/L)	C₁/ (C₂+C₃)	δ¹³C₁/ ‰	T-CH₄/ (μL/L)	C₁/ (C₂+C₃)	δ¹³C₁/ ‰	T-CH₄/ (μL/L)	C₁/ (C₂+C₃)
样品数	42	42	42	42	42	42	42	42	42
最大值	-38.76	7 272.98	7 797.45	-41.16	3 958.93	5 036.51	-29.16	3 470.45	938.92
最小值	-84.11	3.98	5.16	-64.45	7.17	11.67	-56.45	3.00	5.52
平均值	-57.27	736.73	763.63	-52.52	465.04	547.09	-39.78	256.89	116.30
中位数	-57.41	8.49	31.34	-53.09	11.22	32.45	-38.16	5.97	40.53
标准差	13.28	1 682.34	1 679.13	7.84	903.90	1 075.17	6.46	756.36	200.92

	5月份实验数据			8月份实验数据			10月份实验数据
	δ¹³C₁/ ‰	T-CH₄/ (μL/L)	C₁/ (C₂+C₃)	δ¹³C₁/ ‰	T-CH₄/ (μL/L)	C₁/ (C₂+C₃)	δ¹³C₁/ ‰	T-CH₄/ (μL/L)	C₁/ (C₂+C₃)
样品数	42	42	42	42	42	42	42	42	42
最大值	-38.76	7 272.98	7 797.45	-41.16	3 958.93	5 036.51	-29.16	3 470.45	938.92
最小值	-84.11	3.98	5.16	-64.45	7.17	11.67	-56.45	3.00	5.52
平均值	-57.27	736.73	763.63	-52.52	465.04	547.09	-39.78	256.89	116.30
中位数	-57.41	8.49	31.34	-53.09	11.22	32.45	-38.16	5.97	40.53
标准差	13.28	1 682.34	1 679.13	7.84	903.90	1 075.17	6.46	756.36	200.92