Nitrogen enrichment alters carbon fluxes in a New England salt marsh
作者机构：Department of BiologyBryn Mawr CollegeBryn MawrPAUSA
出 版 物：《Ecosystem Health and Sustainability》 (生态系统健康与可持续性（英文）)
年 卷 期：2018年第4卷第11期
页 面：34-44页
核心收录：
基 金：Funding for this project was provided by the National Science Foundation[award DEB-1354124 to TJM award DEB-1719621 to the TIDE Project and awards DEB-1637630&DEB-1238212 to the PIE-LTER].The study was further supported by startup funds from Bryn Mawr College to TJM
主 题：Spartina alterniflora blue carbon eutrophication gross primaryproductivity net ecosystemexchange nitrogen ecosystem respiration tidalsaltmarsh
摘 要：Introduction:Nitrogen enrichment of coastal salt marshes can induce feedbacks that alter ecosystem-level processes including primary production and carbon *** the rising interest in coastal blue carbon,the effects of chronic nutrient enrichment on blue carbon processes have rarely been measured in the context of experimental ***,we examined the ecosystem-level effects of nitrate(NO3)enrichment on the green-house gas dynamics of a Spartina alterniflora-dominated salt *** measured CO2 and CH4 fluxes using static chambers through two growing seasons in a salt marsh that was nitrogen-enriched for 13 years and compared fluxes to those from a reference ***:We found that nitrogen enrichment increased gross primary productivity(GPP)by 7.7%and increased ecosystem respiration(Recd)by 20.8%.However,nitrogen enrichment had no discernible effect on net ecosystem exchange(NEE).Taken together,these results suggest that nitrogen-induced stimulation of Reco could transform this salt marsh from a carbon sink into a source of carbon to the atmos ***:Our results complement prior findings of nitrogen enrichment weakening soil structure and organic matter stability in tidal salt marshes,suggesting that increased nutrient inputs have the potential to alter the carbon storage function of these ecosystems through enhanced microbial respiration of previously sequestered carbon.
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