Sediment Biogeochemistry of Mesophotic Meadows of Calcifying Macroalgae

IF 1.7 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Francis J. Sansone, Heather L. Spalding, Celia M. Smith
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引用次数: 5

Abstract

Mesophotic (low light) sands were studied in Hawaiian coastal waters (39–204?m water depth) from O‘ahu to Kaho‘olawe by sampling inside and outside of extensive macroalgal meadows of chlorophytes Halimeda kanaloana and Udotea sp. during September 2004, December 2004, and November 2006. Porewater nutrient concentrations in these permeable sediments were comparable to those in nearshore sands and were highly elevated at sediment depths available to holdfasts of some algae (5–10?cm); maximum levels were 3.0?μM reactive phosphorus, 33?μM nitrate, 0.70?μM nitrite, 38?μM ammonium, and 130?μM silicic acid. Benthic material is calculated to be the major source of organic matter driving diagenesis in these sediments. Vegetated sediments appeared more oxidizing than unvegetated sediments, and the presence of macroalgae, particularly Halimeda, was generally associated with higher sediment dissolved inorganic carbon levels. Halimeda-vegetated sediments generally had low dissolved inorganic nitrogen (DIN) levels compared to the Udotea-vegetated and non-vegetated sediments, consistent with the net N loss indicated by sediment stoichiometric relationships. In contrast, Udotea-vegetated sediments showed minimal apparent algal DIN uptake.

Abstract Image

钙化大藻中藻草甸沉积物生物地球化学研究
在夏威夷沿海水域研究了中光砂(弱光)。2004年9月、2004年12月和2006年11月在O 'ahu至Kaho 'olawe的大面积绿藻草甸内外取样。这些可渗透沉积物中的孔隙水营养物质浓度与近岸砂中的相当,并且在某些藻类可持生的沉积物深度(5-10 cm)中含量很高;最高水平为3.0?μM活性磷,33?μM硝酸,0.70?m -亚硝酸盐,38?μM铵和130?μM硅酸。根据计算,底栖生物物质是这些沉积物中驱动成岩作用的有机质的主要来源。植被覆盖的沉积物比未植被覆盖的沉积物表现出更强的氧化性,而大型藻类(尤其是海藻类)的存在通常与较高的沉积物溶解无机碳水平有关。与udotea植被和非植被沉积物相比,halimada植被沉积物的溶解无机氮(DIN)水平普遍较低,这与沉积物化学计量关系表明的净N损失一致。相比之下,udotea植物沉积物显示最小的藻对DIN的吸收。
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来源期刊
Aquatic Geochemistry
Aquatic Geochemistry 地学-地球化学与地球物理
CiteScore
4.30
自引率
0.00%
发文量
6
审稿时长
1 months
期刊介绍: We publish original studies relating to the geochemistry of natural waters and their interactions with rocks and minerals under near Earth-surface conditions. Coverage includes theoretical, experimental, and modeling papers dealing with this subject area, as well as papers presenting observations of natural systems that stress major processes. The journal also presents `letter''-type papers for rapid publication and a limited number of review-type papers on topics of particularly broad interest or current major controversy.
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