Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange
	Xiao, K; Wu, JP; Li, HL; Hong, YG; Wilson, AM; Jiao, JJ; Shananan, M
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018
卷号	635 页码:586-597
关键词	Coastal wetlands Hydrodynamic circulation Microbial activity Nitrogen cycle Daya Bay
通讯作者	lihailong@sustc.edu.cn ; yghong@gzhu.edu.cn
英文摘要	Coastal mangrove swamps play an important role in nutrient cycling at the land-ocean boundary. However, little is known about the role of periodic seawater-groundwater exchange in the nitrogen cycling processes. Seawatergroundwater exchange rates and inorganic nitrogen concentrations were investigated along a shore-perpendicular intertidal transect in Daya Bay, China. The intertidal transect comprises three hydrologic subzones (tidal creek, mangrove and bare mudflat zones), each with different physicochemical characteristics. Salinity and hydraulic head measurements taken along the transect were used to estimate the exchange rates between seawater and groundwater over a spring-neap tidal cycle. Results showed that the maximum seawater-groundwater exchange occurred within the tidal creek zone, which facilitated high-oxygen seawater infiltration and subsequent nitrification. In contrast, the lowest exchange rate found in the mangrove zone caused over-loading of organic matter and longer groundwater residence times. This created an anoxic environment conducive to nitrogen loss through the anammox and denitrification processes. Potential oxidation rates of ammonia and nitrite were measured by the rapid and high-throughput method and rates of denitrification and anammox were measured by the modified membrane inlet mass spectrometry (MIMS) with isotope pairing, respectively. In the whole transect, denitrification accounted for 90% of the total nitrogen loss, and anammox accounted for the remaining 10%. The average nitrogen removal rate was about 2.07 g per day per cubic meter of mangrove sediments. (C) 2018 Elsevier B.V. All rights reserved.
学科主题	Environmental Sciences & Ecology
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17054]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Xiao, K,Wu, JP,Li, HL,et al. Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,635:586-597.
APA	Xiao, K.,Wu, JP.,Li, HL.,Hong, YG.,Wilson, AM.,...&Shananan, M.(2018).Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange.SCIENCE OF THE TOTAL ENVIRONMENT,635,586-597.
MLA	Xiao, K,et al."Nitrogen fate in a subtropical mangrove swamp: Potential association with seawater-groundwater exchange".SCIENCE OF THE TOTAL ENVIRONMENT 635(2018):586-597.