Influence of flow on phosphorus-dynamics and particle size in agricultural drainage ditch sediments


Autoři: Jay Capasso aff001;  Jehangir H. Bhadha aff002;  Allan Bacon aff003;  Lilit Vardanyan aff003;  Raju Khatiwada aff002;  Julio Pachon aff003;  Mark Clark aff003;  Timothy Lang aff002
Působiště autorů: UF IFAS Columbia County Extension, University of Florida, Lake City, Florida, United States of America aff001;  Everglades Research and Education Center, Soil and Water Sciences Department, University of Florida, Belle Glade, Florida, United States of America aff002;  Soil and Water Sciences Department, University of Florida, Gainesville, Florida, United States of America aff003
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0227489

Souhrn

Particle size is one factor affecting phosphorus (P) dynamics in soils and sediments. This study investigated how flow facilitated by hydraulic pumps and aquatic vegetation species water lettuce (Pistia stratiotes) and water hyacinth (Eichhornia crassipes) affected particle size and P-dynamics in organic sediments in agricultural drainage ditches. Sediments with finer particle size (>0.002 mm) were hypothesized to contain greater total P (TP) and less labile P than sediments with coarser particle size. Particle size was determined using a LS 13 320 Laser Diffraction Particle Size Analyzer. Sediments were tested for pH, TP, and organic matter. Fractions of P were determined using a sequential fractionation experiment and 31P Nuclear Magnetic Resonance (NMR) Spectroscopy. Larger average particle size and lower average total P concentrations were found in the inflows of the field ditches compared to the outflows. Presence of flow and aquatic vegetation did not have a significant impact on particle size, TP, or labile P fractions. Median (p = 0.10) particle size was not significantly correlated to TP. Overall, there was an average trend of coarser particle size and lower P concentrations in the inflow compared to the outflow. The presence of inorganic limerock could have affected results due to increased P adsorption capacity and larger average particle size compared to the organic fraction of the sediment.

Klíčová slova:

Agricultural soil science – Diffraction – Flow rate – Fractionation – Lasers – NMR spectroscopy – Sediment – Phosphorus-31 NMR spectroscopy


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2020 Číslo 1