Alkaline Phosphatase: An Appraisal of its Critical Role in C-Limited Deep-Sea Sediments of Central Indian Basin

Biche, Sushanta U.; Das, Anindita; Mascarenhas‐Pereira, M.B.L.; Nath, B. Nagender; Naik, Sushant S.; Helekar, Samita P.; Sharma, Rahul; Valsangkar, A.B.; Bharathi, P. A. Loka

doi:10.1080/01490451.2016.1190804

Cited by 10 publications

(13 citation statements)

References 75 publications

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“…The porewater DIP values measured in the investigated area (Figure ) were of similar magnitude reported earlier for the CIB (Biche et al, ; Nath & Mudholkar, ) but very low compared to continental margin sediments of the northern Indian Ocean (Grandel et al, ; Kraal et al, ; Linsy et al, ; Woulds et al, ). Nath and Mudholkar () have attributed the downcore gradient of DIP concentrations in the porewater of the CIB sediments to the mobilization of iron oxyhydroxides.…”

Section: Discussionsupporting

confidence: 86%

“…Along with this high bottom water phosphate (~3 μmol/L) and low sedimentation rate can fuel the adsorption process (Ni et al, ). The clay‐sized sediment content in the area is high (up to 81% by weight; Biche et al, ) and the sedimentation rates in the CIB are extremely low (2–3 mm/kyr, rarely exceeding 1 cm/kyr; Banakar et al, ; Borole, ; Mascarenhas‐Pereira et al, ; Nath et al, ) typical of deep‐sea pelagic sediments. Thus, fine‐grained sediments with very low sedimentation rates in the CIB promote the adsorption of P, and this adsorbed fraction could be an important sink of P from the water column.…”

Section: Discussionmentioning

confidence: 99%

“…The oxic bottom water condition of the CIB sites promotes adsorption of P by iron oxyhydroxides and presence of fine‐grained particles such as clay effectively adsorbs P from porewater. Thus, the porewater DIP becomes low and reduces the release of P from sediments to the water column (see Biche et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Hydrothermal activity and submarine weathering of basalt can act as either source or sink of P to the ocean (Baturin, 1982;Föllmi, 1996). The scavenging of P in hydrothermal areas occurs via coprecipitation/sorption onto volcanogenic ferric oxyhydroxides or by authigenic apatite formation (e.g., Ruttenberg, 2003;Wheat et al, 1996).…”

Section: Contribution Of Hydrothermal Activity To P Speciesmentioning

confidence: 99%

“…Most of the deep‐sea sediments are organic carbon (C org ) poor since most of the organic matter degradation takes place within the water column. Under severe C org depletion and oxic condition, phosphate solubilizing bacteria stimulate liberation of P by dissolving insoluble inorganic forms into soluble P and making it biologically reavailable (Biche et al, ; Chen et al, ; S. Das et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Distribution and Diagenesis of Phosphorus in the Deep‐Sea Sediments of the Central Indian Basin

et al. 2018

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A regional solid‐phase phosphorus (P) speciation study in the Central Indian Basin (CIB) was carried out to elucidate the spatial distribution of sedimentary P species and P diagenesis in an oligotrophic setting. The results show that P enrichment is in the order of biogenic (Pbio) > authigenic (Pauth) > iron bound (PFe) > detrital (Pdet) > organic (Porg) P. The higher concentrations of Pbio are found in siliceous oozes, which are attributed to high biological productivity in the overlying waters compared to pelagic clay region. High Pauth and Pdet contents with low molar Corg/Preact ratios in the pelagic/red clays indicate the deposition of calcium fluorapatite and refractory material from the atmospheric input. The oxygenated bottom water promotes adsorption of P onto iron oxyhydroxides making the PFe an important sink. Remobilization of P within the sediments is limited because of well‐oxygenated conditions and an efficient adsorption by iron oxyhydroxides and clay‐sized sediments. A twofold increase in Ptotal and P‐species is observed in hydrothermally altered, ferruginous sediments from a seamount flank suggesting an important role of hydrothermal processes in P cycling. The calculated P accumulation rate in the present study ranges between 0.6 and 11.7 μmol·cm−2·kyr−1. The burial flux of P for the entire CIB (5.7 × 106 km2) is 0.01 × 1010 mol P per year which accounts for 0.05% of the global flux. The benthic P fluxes from the seawater to the sediments in the area range between 0.0093 and 0.133 μmol·cm−2·kyr−1 indicating that the CIB sediments are an important sink for P.

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