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Elevated nutrient inputs to marshes differentially impact carbon and nitrogen cycling in two northern Gulf of Mexico saltmarsh plants
Biogeochemistry ( IF 4 ) Pub Date : 2020-04-23 , DOI: 10.1007/s10533-020-00656-9 Taylor C. Ledford , Behzad Mortazavi , Corianne Tatariw , Olivia U. Mason
Biogeochemistry ( IF 4 ) Pub Date : 2020-04-23 , DOI: 10.1007/s10533-020-00656-9 Taylor C. Ledford , Behzad Mortazavi , Corianne Tatariw , Olivia U. Mason
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\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$GPP$$\end{document}) 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\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$GPP$$\end{document}, 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.
中文翻译:
在墨西哥湾北部的两个盐沼植物中,沼泽养分输入的增加对碳和氮循环的影响不同
盐沼生物地球化学过程受生态系统结构(例如植物群落组成)的调控。然而,植物对压力因素的特定反应,如营养输入增加,可能对氮 (N) 去除和碳 (C) 固存产生不同的影响。我们进行了田间操作,以研究在北部海湾并置的以杜鹃花或互花米草为主的地块中养分负荷升高对生态系统 C 动力学和硝酸盐还原途径(反硝化和异化硝酸盐还原为铵(DNRA))的影响墨西哥盐沼。我们将该地区的氮和磷 (P) 输入量增加了两倍和三倍。营养丰富对净生态系统交换没有影响。然而,营养投入的三倍增加导致初级生产力总额增加近三分之一(GPP\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \ usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$GPP$$\end{document}) 和互花米草地块中的生态系统呼吸,而J. roemerianus 地块没有影响。与对照相比,互花米草在两个处理水平上的反硝化作用增加了十倍,但与 GPP\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage 一样{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$GPP$$\end{document}, J. roemerianus 地块对更高的营养投入没有反应。相比之下,在 J. roemerianus 地块中,营养物质的三倍增加使 DNRA 减少了一半。这项工作表明,需要考虑沼泽中植物物种特定的反应,以确定更高的养分输入对植物生产力和氮去除和保留的影响。
更新日期:2020-04-23
中文翻译:
在墨西哥湾北部的两个盐沼植物中,沼泽养分输入的增加对碳和氮循环的影响不同
盐沼生物地球化学过程受生态系统结构(例如植物群落组成)的调控。然而,植物对压力因素的特定反应,如营养输入增加,可能对氮 (N) 去除和碳 (C) 固存产生不同的影响。我们进行了田间操作,以研究在北部海湾并置的以杜鹃花或互花米草为主的地块中养分负荷升高对生态系统 C 动力学和硝酸盐还原途径(反硝化和异化硝酸盐还原为铵(DNRA))的影响墨西哥盐沼。我们将该地区的氮和磷 (P) 输入量增加了两倍和三倍。营养丰富对净生态系统交换没有影响。然而,营养投入的三倍增加导致初级生产力总额增加近三分之一(GPP\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \ usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$GPP$$\end{document}) 和互花米草地块中的生态系统呼吸,而J. roemerianus 地块没有影响。与对照相比,互花米草在两个处理水平上的反硝化作用增加了十倍,但与 GPP\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage 一样{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$GPP$$\end{document}, J. roemerianus 地块对更高的营养投入没有反应。相比之下,在 J. roemerianus 地块中,营养物质的三倍增加使 DNRA 减少了一半。这项工作表明,需要考虑沼泽中植物物种特定的反应,以确定更高的养分输入对植物生产力和氮去除和保留的影响。