气候变化领域集成服务门户(CCPortal): Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments

CCPortal

DOI	10.1007/s10533-021-00795-7
	Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments
	Mazur C.I.; Al-Haj A.N.; Ray N.E.; Sanchez-Viruet I.; Fulweiler R.W.
发表日期	2021
ISSN	1682563
起始页码	37
结束页码	62
卷号	154 期号:1
英文摘要	Organic matter (OM) loading drives benthic metabolism and controls nitrogen (N), phosphorus (P), and carbon (C) cycling in coastal sediments. To better understand the influence of OM on benthic metabolism, we conducted sediment core incubations in Long Island Sound, NY (USA), an estuary heavily influenced by anthropogenic nutrient loading. Cores were collected during the summer and winter at five stations along a west to east transect representing a gradient of high to low nutrient inputs and subsequent OM deposition. Here we provide a comprehensive analysis of environmental drivers of benthic fluxes as well as the first directly measured rates of sediment denitrification and N-fixation, thus providing a missing piece of the N budget for Long Island Sound. Our findings show greatest sediment oxygen demand (SOD) in the western basin during the summer. Sediments were a source of dissolved inorganic N and P. Compared to historic SOD and ammonium fluxes, our measurements were about 50% lower, potentially reflecting larger scale perturbations (e.g., warming temperatures, decrease wind speed) or reduced N loading through improved management of wastewater treatment facilities. Sediments were a source of nitrous oxide (mean (± standard error): 8.63 ± 3.18 nmol m−2 h−1) and methane (23.80 ± 18.05 nmol m−2 h−1). Net sediment denitrification rates were low (10.34 ± 7.61 µmol N2–N m−2 h−1) and did not vary significantly across stations or seasons. These sediments have a N removal efficiency of ~ 30% with the potential to remove approximately 9% of the total land-based N load entering Long Island Sound. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Denitrification; Greenhouse gases; Nutrient loading; Sediment–water flux
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184598
作者单位	Department of Earth and Environment, Boston University, 685 Commonwealth Avenue, Boston, MA 02215, United States; Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, United States; University of Maryland Center for Environmental Science, Solomons, MD 20688, United States
推荐引用方式 GB/T 7714	Mazur C.I.,Al-Haj A.N.,Ray N.E.,et al. Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments[J],2021,154(1).
APA	Mazur C.I.,Al-Haj A.N.,Ray N.E.,Sanchez-Viruet I.,&Fulweiler R.W..(2021).Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments.Biogeochemistry,154(1).
MLA	Mazur C.I.,et al."Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments".Biogeochemistry 154.1(2021).