naa a22 4500 510751369 CHVBK 20180411083105.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11270-013-1520-6 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1520-6 Preliminary Evidence of Sediment and Phosphorus Dynamics Behind Newly Installed Low-Grade Weirs in Agricultural Drainage Ditches [Elektronische Daten] [E. Usborne, R. Kröger, S. Pierce, J. Brandt, D. Goetz] Low-grade weirs are innovative management strategies that control surface drainage, slow water velocities, and encourage sedimentation in agricultural drainage ditches. There is little information on how low-grade weirs perform in terms of short-term (0-12months) sediment retention and associated phosphorus (P) dynamics. This study documents initial results of sediment and P dynamics of low-grade weirs in a drainage system that was built in a two-stage ditch design. Average sediment deposition did not differ significantly among sites (χ 2 = 2.42; P = 0.49); however, average water depths behind weir sites were significantly greater (28 ± 10cm) than the comparison inflow site (6 ± 8cm; χ 2 = 7.67; P = 0.05). Total P concentrations were not significantly different through time, or between sites, but there was a general trend of progressively higher total P retention moving downstream. Bioavailability ratios of P (i.e., the ratio of potentially bioavailable to non-bioavailable P fractions) were similar between all sites through time (χ 2 = 2.09; P = 0.55). The only variables correlated significantly with time were found at the inflow site, where water depth significantly decreased with corresponding increases in sediment/water column pH and bioavailability ratios. From best management practice installation to 12months after construction, there was a lack of significant correlations with any measured variables behind weirs. However, the lack of correlation between variables suggests increasing the hydroperiod, reducing the ephemeral nature of the drainage ditch system, and prolonging inundation, improves conditions for P retention. Springer Science+Business Media Dordrecht, 2013 Phosphorus nationallicence Sediment nationallicence Drainage ditches nationallicence Weirs nationallicence Usborne E. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut Kröger R. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut Pierce S. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut Brandt J. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut Goetz D. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-11 0049-6979 224:4<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1520-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1520-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Usborne E. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 700 1- Kröger R. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 700 1- Pierce S. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 700 1- Brandt J. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 700 1- Goetz D. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-11 0049-6979 224:4<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer