NDLI: Physicochemical assessment and phosphorus storage of canal sediments within the Everglades Agricultural Area, Florida

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Physicochemical assessment and phosphorus storage of canal sediments within the Everglades Agricultural Area, Florida

Content Provider	Springer Nature Link
Author	Das, Jaya Daroub, Samira H. Bhadha, Jehangir H. Lang, Timothy A. Diaz, Orlando Harris, Willie
Copyright Year	2012
Abstract	Excess nutrients such as phosphorus (P) transported from the Everglades Agricultural Area (EAA) in South Florida, USA, to downstream water bodies have been identified as contributing to trophic imbalances within the Florida Everglades. Decades of farming drainage from the EAA has led to accumulation of sediments in regional canals which may be transported to downstream ecosystems and act as potential internal source of P.Intact sediment cores were collected from three main conveyance and three farm canals within the EAA. Physicochemical assessment, mineralogy, P speciation, and storage were determined for surface and subsurface layers.The main conveyance canal sediments had higher total P (TP) concentrations (1,280 ± 360 mg kg$^{-1}$) than the farm canals (960 ± 540 mg kg$^{-1}$), while farm canal sediments showed higher organic matter content (28–53 %) compared to the main canal (24–27 %) sediments. The minerals found in main conveyance canal sediments were similar to those found in Lake Okeechobee. The labile KCl–P fraction comprised <2 % of TP from all canal sediments, while NaOH–Pi (i = inorganic) fraction consisted of 1–14 % of TP. The majority of P in the canal sediments was contained in the HCl–P fraction (Ca–P and Mg–P), comprising >50 % of TP in the main and farm canal sediments. An estimated 73 metric tons (mt) of P was stored in the 0–10-cm layer of the three main conveyance canals within the EAA boundary of which 57-mt P is reactive and potentially available for release at different time scales.The EAA canal sediments are highly organic with low bulk density and susceptible of being transported to downstream ecosystems. Many factors can impact the potential release of the reactive stored P, including redox potential of sediments as well as the overlying water column P concentration. Further investigation of potential P release from these sediments is warranted.
Starting Page	952
Ending Page	965
Page Count	14
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	12
Issue Number	6
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-04-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Best management practice Canals Everglades Agricultural Area Phosphorus Sediments Environmental Physics Soil Science & Conservation Environment
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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