Nitrate reduction rates and sediment physicochemical conditions from a natural and constructed marsh in coastal Alabama from 2018-11-30 to 2019-09-06 (NCEI Accession 0210961)

This dataset includes nitrate reduction rates and physicochemical characteristics from sediments collected from a natural (NAT) and a 32-year-old constructed (CON-2) marsh on the Alabama (USA) coast. Three cores were collected from each marsh on three dates (30 November 2018, 26 March 2019, 06 September 2019) to a depth of 25 cm. Cores were partitioned to 5 cm depth increments for all measurements. Nitrogen removal (denitrification) and retention (dissimilatory nitrate reduction to ammonium, DNRA) were measured with and without glucose additions using isotope pairing on sediment slurries. Plant belowground biomass, extractable ammonium, and organic matter content were measured as well. The percent contribution of denitrification to total nitrate reduction was calculated to determine how much nitrogen is removed vs. retained.

本数据集收录了来自美国阿拉巴马海岸自然（NAT）和32年历史的人工构建（CON-2）湿地沉积物中硝酸盐还原速率及物理化学特性。在每个湿地中，于2018年11月30日、2019年3月26日及2019年9月6日三个日期分别采集了三根深度为25厘米的沉积物柱样。柱样被分割为5厘米深度间隔，以进行所有测量。通过在沉积物悬浮液中加入葡萄糖，并利用同位素配对技术，测量了有和无葡萄糖添加条件下的氮去除（反硝化作用）和保留（异化硝酸盐还原为铵，DNRA）情况。同时，还测量了地下植物生物量、可提取铵和有机物含量。通过计算反硝化作用对总硝酸盐还原的百分比贡献，以确定去除与保留的氮含量之比。