Forms of organic phosphorus in wetland soils

Cheesman, A.W., Turner, B.L., and Reddy, K.R. (2014) Forms of organic phosphorus in wetland soils. Biogeosciences, 11. pp. 6697-6710.

[img]
Preview
PDF (Published Version) - Published Version
Available under License Creative Commons Attribution.

Download (2MB) | Preview
View at Publisher Website: http://dx.doi.org/10.5194/bg-11-6697-201...
 
2
33


Abstract

Phosphorus (P) cycling in freshwater wetlands is dominated by biological mechanisms, yet there has been no comprehensive examination of the forms of biogenic P (i.e., forms derived from biological activity) in wetland soils. We used solution 31P NMR spectroscopy to identify and quantify P forms in surface soils of 28 palustrine wetlands spanning a range of climatic, hydrogeomorphic, and vegetation types. Total P concentrations ranged between 51 and 3516 μg P g-1, of which an average of 58% was extracted in a single-step NaOH–EDTA procedure. The extracts contained a broad range of P forms, including phosphomonoesters (averaging 24% of the total soil P), phosphodiesters (averaging 10% of total P), phosphonates (up to 4% of total P), and both pyrophosphate and long-chain polyphosphates (together averaging 6% of total P). Soil P composition was found to be dependant upon two key biogeochemical properties: organic matter content and pH. For example, stereoisomers of inositol hexakisphosphate were detected exclusively in acidic soils with high mineral content, while phosphonates were detected in soils from a broad range of vegetation and hydrogeomorphic types but only under acidic conditions. Conversely inorganic polyphosphates occurred in a broad range of wetland soils, and their abundance appears to reflect more broadly that of a "substantial" and presumably active microbial community with a significant relationship between total inorganic polyphosphates and microbial biomass P. We conclude that soil P composition varies markedly among freshwater wetlands but can be predicted by fundamental soil properties.

Item ID: 38831
Item Type: Article (Refereed Research - C1)
ISSN: 1726-4189
Funders: USDA-CREES National Research Initiative, McKnight Brain Institute, University of Florida
Projects and Grants: USDA-CREES BRI no. 2004-35107-14918
Date Deposited: 25 May 2015 02:51
Downloads: Total: 33
Last 12 Months: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page