...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial and seasonal variations of sulphate, dissolved organic carbon, and nutrients in deep pore waters of intertidal flat sediments
【24h】

Spatial and seasonal variations of sulphate, dissolved organic carbon, and nutrients in deep pore waters of intertidal flat sediments

机译：潮间带平坦沉积物深孔水中硫酸盐，溶解有机碳和养分的时空变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spatial and seasonal variations of sulphate, dissolved organic carbon (DOC), nutrients and metabolic products were determined down to 5 m sediment depth in pore waters of intertidal flats located in NW Germany. The impact of sediment permeability, pore water flow, and organic matter supply on deep pore water biogeochemistry was evaluated. Low sediment permeability leads to an enrichment of reminer-alisation products in pore waters of clay-rich sediments. In permeable sandy sediments pore water biogeochemistry differs depending on whether tidal flat margins or central parts of the tidal flat are studied. Pore water flow in tidal flat margins increases organic matter input. Substrate availability and enhanced temperatures in summer stimulate sulphate reducers down to 3.5 m sediment depth. Sulphate, DOC, and nutrient concentrations exhibit seasonal variations in deep permeable sediments of the tidal flat margin. In contrast, seasonal variations are small in deep pore waters of central parts of the sand flat. This study shows for the first time that seasonal variations in pore water chemistry are not limited to surface sediments, but may be observed down to some metres depth in permeable tidal flat margin sediments. In such systems more organic matter seems to be remineralised than deduced from surface sediment studies.
机译：在位于德国西北部的潮间带的孔隙中，确定了低至5 m沉积深度的硫酸盐，溶解有机碳（DOC），养分和代谢产物的空间和季节变化。评估了沉积物渗透率，孔隙水流量和有机质供应对深层孔隙水生物地球化学的影响。较低的沉积物渗透性导致富含粘土的沉积物的孔隙水中富矿化产品的富集。在渗透性砂质沉积物中，孔隙水的生物地球化学因是否研究了潮滩边缘或潮滩中心部分而异。潮滩边缘的孔隙水流量增加了有机物的输入。夏季可用的底物和温度升高刺激了硫酸盐还原剂的沉积，其沉积深度降至3.5 m。潮汐边缘的深层可渗透沉积物中的硫酸盐，DOC和养分含量表现出季节性变化。相反，在砂滩中心部分的深层孔隙水中，季节变化较小。这项研究首次表明，孔隙水化学成分的季节性变化不仅限于地表沉积物，而且在渗透性潮汐平坦边缘沉积物中甚至可以观察到几米深。在这样的系统中，似乎比从地表沉积物研究中推断出的更多的有机物被再矿化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号