Rapid sulfur cycling in sediments from the Peruvian oxygen minimum zone featuring simultaneous sulfate reduction and sulfide oxidation
Rapid sulfur cycling in sediments from the Peruvian oxygen minimum zone featuring simultaneous sulfate reduction and sulfide oxidation
复制标题
秘鲁含氧最低区沉积物中硫的快速循环，同时硫酸盐还原和硫化物氧化
DOI：
10.1002/lno.11779
复制
发表时间：
2021
影响因子：
4.5
通讯作者：
S. Sommer
中科院分区：
文献类型：
--
作者：
T. Treude;L. J. Hamdan;Sydnie Lemieux;A. Dale;S. Sommer
细菌硫酸盐还原（SR）通常通过放射性示踪技术使用35 S标记的硫酸盐测定。在硫化物同时氧化的环境中，由于35 S硫化物的再氧化，SR可能被低估。预计35 S示踪剂的再循环在具有低浓度孔隙水硫化物和高丰度的巨型丝状硫氧化细菌（GFAP）的沉积物中是高的。在这里，我们应用硫化物spiking方法，最初开发的水样，沉积物沿着陆棚斜坡横断面（72，128，243，752米水深）穿越秘鲁氧气最小区。将在35 S-硫酸盐注射前加标未标记硫化物以防止放射性示踪剂再循环的沉积物与未加标沉积物进行比较。在以低天然硫化物和丰富的GFR 4（128和243米）为特征的站点，该方法显示，在加标沉积物中SR率高出1-3倍。尽管存在GFR 4（72 m），但在天然硫化物含量高的沉积物中，加标对SR没有影响。生物扰动沉积物缺乏GFR 4（752米）显示SR在加标样品中升高，可能是从人工引入硫化物条件。硫化物氧化率在128和243米的站，来自SR之间的差异加标和未加标的沉积物，近似率异化硝酸盐还原铵的GFR 4。总SR在三个最浅的站底栖溶解无机碳通量的贡献很大，证实SR是一个重要的过程，底栖碳呼吸内的氧最小区。我们建议进一步探索掺入方法，以捕获具有低硫化物浓度和高硫循环的沉积物中的硫。
Bacterial sulfate reduction (SR) is often determined by radiotracer techniques using 35S‐labeled sulfate. In environments featuring simultaneous sulfide oxidation, SR can be underestimated due to re‐oxidation of 35S‐sulfide. Recycling of 35S‐tracer is expected to be high in sediment with low concentrations of pore‐water sulfide and high abundance of giant filamentous sulfur‐oxidizing bacteria (GFSOB). Here, we applied a sulfide‐spiking method, originally developed for water samples, to sediments along a shelf‐slope transect (72, 128, 243, 752 m water depth) traversing the Peruvian oxygen minimum zone. Sediment spiked with unlabeled sulfide prior to 35S‐sulfate injection to prevent radiotracer recycling was compared to unspiked sediment. At stations characterized by low natural sulfide and abundant GFSOB (128 and 243 m), the method revealed 1–3 times higher SR rates in spiked sediment. Spiking had no effect on SR in sediment with high natural sulfide despite presence of GFSOB (72 m). Bioturbated sediment devoid of GFSOB (752 m) showed elevated SR in spiked samples, likely from artificial introduction of sulfidic conditions. Sulfide oxidation rates at the 128 and 243 m station, derived from the difference in SR between spiked and unspiked sediment, approximated rates of dissimilatory nitrate reduction to ammonium by GFSOB. Gross SR contributed considerably to benthic dissolved inorganic carbon fluxes at the three shallowest station, confirming that SR is an important process for benthic carbon respirations within the oxygen minimum zone. We recommend to further explore the spiking method to capture SR in sediment featuring low sulfide concentrations and high sulfur cycling by GFSOB.
DOI：
10.1016/j.dsr.2016.03.001
发表时间：
2016-06
期刊：
--
影响因子：
--
作者：
S. Sommer;Jessica Gier;T. Treude;Ulrike Lomnitz;M. Dengler;J. Cardich;A. Dale
通讯作者：
S. Sommer;Jessica Gier;T. Treude;Ulrike Lomnitz;M. Dengler;J. Cardich;A. Dale
影响因子：
4.9
作者：
Dale, A. W.;Sommer, S.;Wallmann, K.
通讯作者：
Wallmann, K.
影响因子：
5
作者：
Bohlen, L.;Dale, A. W.;Wallmann, K.
通讯作者：
Wallmann, K.