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基于涡度相关测量的废弃北方泥炭地牧场近乎零的甲烷排放

Near-zero methane emission from an abandoned boreal peatland pasture based on eddy covariance measurements.

作者信息

Wang Mei, Wu Jianghua, Luan Junwei, Lafleur Peter, Chen Huai, Zhu Xinbiao

机构信息

Sustainable Resource Management, Memorial University of Newfoundland, Corner Brook, Canada.

School of Geographical Sciences, South China Normal University, Guangzhou, China.

出版信息

PLoS One. 2017 Dec 18;12(12):e0189692. doi: 10.1371/journal.pone.0189692. eCollection 2017.

Abstract

Although estimates of the annual methane (CH4) flux from agriculturally managed peatlands exist, knowledge of controls over the variation of CH4 at different time-scales is limited due to the lack of high temporal-resolution data. Here we present CH4 fluxes measured from May 2014 to April 2016 using the eddy covariance technique at an abandoned peatland pasture in western Newfoundland, Canada. The goals of the study were to identify the controls on the seasonal variations in CH4 flux and to quantify the annual CH4 flux. The seasonal variation in daily CH4 flux was not strong in the two study years, however a few periods of pronounced emissions occurred in the late growing season. The daily average CH4 flux was small relative to other studies, ranging from -4.1 to 9.9 nmol m-2 s-1 in 2014-15 and from -7.1 to 12.1 nmol m-2 s-1 in 2015-16. Stepwise multiple regression was used to investigate controls on CH4 flux and this analysis found shifting controls on CH4 flux at different periods of the growing season. During the early growing season CH4 flux was closely related to carbon dioxide fixation rates, suggesting substrate availability was the main control. The peak growing season CH4 flux was principally controlled by the CH4 oxidation in 2014, where the CH4 flux decreased and increased with soil temperature at 50 cm and soil water content at 10 cm, but a contrasting temperature-CH4 relation was found in 2015. The late growing season CH4 flux was found to be regulated by the variation in water table level and air temperature in 2014. The annual CH4 emission was near zero in both study years (0.36 ± 0.30 g CH4 m-2 yr-1 in 2014-15 and 0.13 ± 0.38 g CH4 m-2 yr-1 in 2015-16), but fell within the range of CH4 emissions reported for agriculturally managed peatlands elsewhere.

摘要

虽然已有关于农业管理泥炭地年甲烷(CH₄)通量的估算,但由于缺乏高时间分辨率数据,对于不同时间尺度上CH₄变化的控制因素了解有限。在此,我们展示了2014年5月至2016年4月期间,利用涡度协方差技术在加拿大纽芬兰西部一个废弃泥炭地牧场测量的CH₄通量。本研究的目标是确定CH₄通量季节变化的控制因素,并量化年CH₄通量。在两个研究年份中,每日CH₄通量的季节变化并不强烈,不过在生长季后期出现了一些明显的排放期。与其他研究相比,每日平均CH₄通量较小,2014 - 2015年为-4.1至9.9 nmol m⁻² s⁻¹,2015 - 2016年为-7.1至12.1 nmol m⁻² s⁻¹。采用逐步多元回归研究CH₄通量的控制因素,该分析发现生长季不同时期对CH₄通量的控制因素有所变化。在生长季早期,CH₄通量与二氧化碳固定速率密切相关,表明底物可用性是主要控制因素。2014年生长季高峰期CH₄通量主要受CH₄氧化控制,CH₄通量随50厘米深度土壤温度和10厘米深度土壤含水量的变化而降低和升高,但在2015年发现了相反的温度-CH₄关系。发现2014年生长季后期CH₄通量受地下水位和气温变化的调节。在两个研究年份中年CH₄排放量均接近零(2014 - 2015年为0.36 ± 0.30 g CH₄ m⁻² yr⁻¹,2015 - 2016年为0.13 ± 0.38 g CH₄ m⁻² yr⁻¹),但仍在其他地方农业管理泥炭地报告的CH₄排放量范围内。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/020c/5734750/22519c2ec5a1/pone.0189692.g001.jpg

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