气候变化领域集成服务门户(CCPortal): Elevated nutrient inputs to marshes differentially impact carbon and nitrogen cycling in two northern Gulf of Mexico saltmarsh plants

CCPortal

DOI	10.1007/s10533-020-00656-9
	Elevated nutrient inputs to marshes differentially impact carbon and nitrogen cycling in two northern Gulf of Mexico saltmarsh plants
	Ledford T.C.; Mortazavi B.; Tatariw C.; Mason O.U.
发表日期	2020
ISSN	0168-2563
卷号	149 期号:1
英文摘要	Salt marsh biogeochemical processes are regulated by ecosystem structure (e.g. plant community composition). However, plant-specific responses to stressors such as elevated nutrient inputs can have differing impacts on nitrogen (N) removal and carbon (C) sequestration. We conducted a field manipulation to investigate the impact of elevated nutrient loading on ecosystem C dynamics and nitrate reduction pathways (denitrification and dissimilatory nitrate reduction to ammonium (DNRA)) in plots dominated by either Juncus roemerianus or Spartina alterniflora that were collocated in a northern Gulf of Mexico salt marsh. We increased N and phosphorus (P) inputs by two- and three-times current levels in the region. Nutrient enrichment had no effect on net ecosystem exchange. However, a three-fold increase in nutrient input resulted in nearly one-third increases in gross primary productivity (GPP) and ecosystem respiration in S. alterniflora plots, whereas there was no impact in J. roemerianus plots. Denitrification increased in S. alterniflora plots tenfold at both treatment levels relative to controls, but as with GPP, there was no response in J. roemerianus plots to higher nutrient inputs. In contrast, a three-fold increase in nutrients reduced DNRA by half in J. roemerianus plots. This work demonstrates that plant species-specific responses in marshes need to be considered for determining the impact of higher nutrient inputs on plant productivity and N-removal and retention. © 2020, Springer Nature Switzerland AG.
英文关键词	Denitrification; DNRA; Juncus roemerianus; Net ecosystem exchange; Plant productivity; Spartina alterniflora
语种	英语
scopus关键词	carbon cycle; carbon sequestration; ecosystem structure; net ecosystem exchange; nitrogen cycle; nutrient enrichment; plant community; respiration; saltmarsh; Atlantic Ocean; Gulf of Mexico; Juncus roemerianus; Spartina alterniflora
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/153148
作者单位	Department of Biological Sciences, University of Alabama, 300 Hackberry Lane, Tuscaloosa, AL 35487, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL 32306, United States
推荐引用方式 GB/T 7714	Ledford T.C.,Mortazavi B.,Tatariw C.,et al. Elevated nutrient inputs to marshes differentially impact carbon and nitrogen cycling in two northern Gulf of Mexico saltmarsh plants[J],2020,149(1).
APA	Ledford T.C.,Mortazavi B.,Tatariw C.,&Mason O.U..(2020).Elevated nutrient inputs to marshes differentially impact carbon and nitrogen cycling in two northern Gulf of Mexico saltmarsh plants.Biogeochemistry,149(1).
MLA	Ledford T.C.,et al."Elevated nutrient inputs to marshes differentially impact carbon and nitrogen cycling in two northern Gulf of Mexico saltmarsh plants".Biogeochemistry 149.1(2020).