干旱区生态环境知识资源中心(Arid): CO2 and CH4 Emissions from an Arid Fluvial Network on the Chinese Loess Plateau

Arid

DOI	10.3390/w13121614
	CO2 and CH4 Emissions from an Arid Fluvial Network on the Chinese Loess Plateau
	Chan, Chun-Ngai; Shi, Hongyan; Liu, Boyi; Ran, Lishan
通讯作者	Ran, LS (corresponding author), Univ Hong Kong, Dept Geog, Hong Kong, Peoples R China. ; Ran, LS (corresponding author), Univ Hong Kong, Shenzhen Inst Res & Innovat, Shenzhen 518000, Peoples R China.
来源期刊	WATER
EISSN	2073-4441
出版年	2021
卷号	13 期号:12
英文摘要	The emissions of greenhouse gases (GHGs) from inland waters are an important component of the global carbon (C) cycle. However, the current understanding of GHGs emissions from arid river systems remains largely unknown. To shed light on GHGs emissions from inland waters in arid regions, high-resolution carbon dioxide (CO2) and methane (CH4) emission measurements were carried out in the arid Kuye River Basin (KRB) on the Chinese Loess Plateau to examine their spatio-temporal variability. Our results show that all streams and rivers were net C sources, but some of the reservoirs in the KRB became carbon sinks at certain times. The CO2 flux (FCO2) recorded in the rivers (91.0 mmol m(-2) d(-1)) was higher than that of the reservoirs (10.0 mmol m(-2) d(-1)), while CH4 flux (FCH4) in rivers (0.35 mmol m(-2) d(-1)) was lower than that of the reservoirs (0.78 mmol m(-2) d(-1)). The best model developed from a number of environmental parameters was able to explain almost 40% of the variability in partial pressure of CO2 (pCO(2)) for rivers and reservoirs, respectively. For CH4 emissions, at least 70% of the flux occurred in the form of ebullition. The emissions of CH4 in summer were more than threefold higher than in spring and autumn, with water temperature being the key environmental variable affecting emission rates. Since the construction of reservoirs can alter the morphology of existing fluvial systems and consequently the characteristics of CO2 and CH4 emissions, we conclude that future sampling efforts conducted at the basin scale need to cover both rivers and reservoirs concurrently.
英文关键词	carbon dioxide methane carbon cycle Chinese Loess Plateau arid fluvial network
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000666950100001
WOS关键词	WATER GAS-EXCHANGE ; CARBON-DIOXIDE ; METHANE EBULLITION ; PARTIAL-PRESSURE ; RIVER NETWORK ; WIND-SPEED ; LAKE ; STREAMS ; FLUXES ; TEMPERATURE
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351970
作者单位	[Chan, Chun-Ngai; Liu, Boyi; Ran, Lishan] Univ Hong Kong, Dept Geog, Hong Kong, Peoples R China; [Shi, Hongyan] Inner Mongolia Univ, Sch Ecol & Environm, Hohhot 010021, Peoples R China; [Ran, Lishan] Univ Hong Kong, Shenzhen Inst Res & Innovat, Shenzhen 518000, Peoples R China
推荐引用方式 GB/T 7714	Chan, Chun-Ngai,Shi, Hongyan,Liu, Boyi,et al. CO2 and CH4 Emissions from an Arid Fluvial Network on the Chinese Loess Plateau[J],2021,13(12).
APA	Chan, Chun-Ngai,Shi, Hongyan,Liu, Boyi,&Ran, Lishan.(2021).CO2 and CH4 Emissions from an Arid Fluvial Network on the Chinese Loess Plateau.WATER,13(12).
MLA	Chan, Chun-Ngai,et al."CO2 and CH4 Emissions from an Arid Fluvial Network on the Chinese Loess Plateau".WATER 13.12(2021).