Variation in sediment and seagrass characteristics reflect multiple stressors along a nitrogen‐enrichment gradient in a New England lagoon
Variation in sediment and seagrass characteristics reflect multiple stressors along a nitrogen‐enrichment gradient in a New England lagoon
复制标题
沉积物和海草特征的变化反映了新英格兰泻湖沿氮富集梯度的多种压力源
DOI：
10.1002/lno.12025
复制
发表时间：
2022
影响因子：
4.5
通讯作者：
Hayn, Melanie
中科院分区：
文献类型：
--
作者：
Haviland, Katherine Ann;Howarth, Robert Warren;Marino, Roxanne;Hayn, Melanie
我们检查了2007-2010年和2017-2019年沿海海洋生态系统（Cape Cod，马萨诸塞州）中海草叶组织中有机碳，溶解硫化物，总沉积物硫和稳定硫同位素比的浓度。我们还测量了海草地上和地下生物量，表生生物量和叶片叶绿素含量。在前一时期，海草出现在所有地点，但到2011年，我们受氮影响最严重的地点（Snug Harbor）已经消失。2007-2010年，Snug港沉积物有机碳和溶解态硫化物含量最高，并沿着梯度降低;叶片组织中34 S含量的减少也表明在富营养化程度较高的地区，硫化物侵入海草组织的程度较高。到2017-2019年，Snug Harbor的沉积物有机碳和孔隙水溶性硫化物有所减少，但在中间站点有所增加，达到海草死亡前受影响最严重的站点的水平。再次，叶tissue 34 S耗尽反映了这种模式，表明海草暴露于最高的硫化物在中间网站。在海草消失后的几年里，Snug港沉积物有机碳和可溶性硫化物的减少说明了海草床中高有机质与营养丰富系统中可溶性硫化物升高等压力源之间的反馈。我们发现沉积物条件和海草反应之间存在显着关系，包括更大的地上地下生物量比，表生生物量，以及在高孔隙水硫化物和高有机沉积物的站点34 S耗尽的叶子。我们的研究表明，减少人为氮进入港口是必要的，以改善沉积物质量和防止海草死亡。
We examined concentrations of organic carbon, dissolved sulfides, total sediment sulfur, and stable sulfur isotope ratios in seagrass leaf tissues across a nitrogen‐enrichment gradient in a coastal marine ecosystem (Cape Cod, Massachusetts) in 2007–2010 and 2017–2019. We also measured seagrass aboveground and belowground biomass, epibiota biomass, and leaf chlorophyll content. Seagrasses were present at all sites in the former period but were lost at our most nitrogen‐impacted site (Snug Harbor) by 2011. In 2007–2010, sediment organic carbon and dissolved sulfides were highest in Snug Harbor and decreased along the gradient; leaf tissues depleted in34S also indicated higher sulfide intrusion into seagrass tissues in more eutrophic areas. By 2017–2019, sediment organic carbon and pore‐water soluble sulfides had decreased in Snug Harbor, but had increased at the intermediate site, to levels found at the most impacted site prior to the seagrass die‐off. Again, leaf tissue34S depletion reflected this pattern, indicating seagrasses were exposed to the highest sulfides at the intermediate site. The decreases in sediment organic carbon and soluble sulfides in Snug Harbor years after the loss of the seagrasses illustrate a feedback between high organic matter in seagrass beds and increasing stressors like elevated soluble sulfides in nutrient‐enriched systems. We found significant relationships between sediment conditions and seagrass responses, including greater aboveground to belowground biomass ratios, epibiota biomass, and34S‐depleted leaves at sites with high pore‐water sulfide and highly organic sediments. Our research suggests that the reduction of anthropogenic nitrogen entering the harbor is necessary for improving sediment quality and preventing seagrass mortality.
登录
查看更多内容
海草生态系统的生产力和生物地球化学循环
DOI：
--
发表时间：
2019
期刊：
Coastal Wetlands
影响因子：
--
作者：
M. Holmer
通讯作者：
M. Holmer
影响因子：
2.7
作者：
M. Hayn;R. Howarth;Roxanne Marino;N. Ganju;P. Berg;K. Foreman;A. Giblin;K. McGlathery
通讯作者：
K. McGlathery
影响因子：
2.9
作者：
GILBOAGARBER, N
通讯作者：
GILBOAGARBER, N
影响因子：
4.5
作者：
Gacia, E;Duarte, CM;Middelburg, JJ
通讯作者：
Middelburg, JJ
温带沿海海湾放牧者控制鳗草附生植物固氮的证据
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
Laura K. Reynolds;Roxanne Marino;M. Muth;Natalie A. McLenaghan;M. Hayn;A. C. Tyler;K. McGlathery;R. Howarth
通讯作者：
R. Howarth