CH4 Flux Characteristics of Qinghai Lake Alpine Wetland Ecosystem during Growing Season

doi:10.7522/j.issn.1000-694X.2017.00057

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (5): 1078-1085.DOI: 10.7522/j.issn.1000-694X.2017.00057

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CH₄ Flux Characteristics of Qinghai Lake Alpine Wetland Ecosystem during Growing Season

Wu Fangtao^1,2, Cao Shengkui^1,2, Cao Guangchao^1,2, Han Guangzhao¹, Lin Yangyang¹, Cheng Shuyan¹

1. College of Life and Geography Sciences, Qinghai Normal University, Xining 810008, China;
2. Qinghai Province Key Laboratory of Physical Geography and Environmental Process, Qinghai Normal University, Xining 810008, China

Received:2017-04-16 Revised:2017-06-14 Online:2018-09-20 Published:2018-11-03

Abstract

Abstract: Taking the Qinghai Lake alpine wetland ecosystem as the research object, the CH₄ flux of 2015 and 2016 years was studied using the eddy covariance method. Results show that the average diurnal variation of CH₄ emission in the daytime and weakly absorbed or emissioned at night, with daily average value was 56.67 mg·m^-2 in 2015, and the value was 35.92 mg·m^-2 in 2016. July and August of the growing season wre the largest monthly emissions, while emissions were weaker in the early and late growth season. The maximum monthly emission in 2015 was in July, with a value of 3.76 g·m^-2, 2016 the maximum monthly emission occurred in August with a value of 1.67 g·m^-2. There was a significant correlation between temperature, soil conductivity, soil volume water content and CH₄ flux, among them the air temperature is liningly related to CH₄ flux. There was also a significant correlation between total primary productivity, respiration, hydrothermal flux and CH₄ flux, and the primary productivity and respiration of ecosystems were the main factors affecting the dynamic change of methane.

Key words: Qinghai Lake, alpine wetland, methane flux, eddy covariance

CLC Number:

X171

Wu Fangtao, Cao Shengkui, Cao Guangchao, Han Guangzhao, Lin Yangyang, Cheng Shuyan. CH₄ Flux Characteristics of Qinghai Lake Alpine Wetland Ecosystem during Growing Season[J]. Journal of Desert Research, 2018, 38(5): 1078-1085.

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CH₄ Flux Characteristics of Qinghai Lake Alpine Wetland Ecosystem during Growing Season

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