Article Ecosystem Organic Carbon Stock Estimations in the Sile River, North Eastern Italy Alessandro Buosi *, Yari Tomio, Abdul-Salam Juhmani and Adriano Sfriso Department of Environmental Sciences, Informatics and Statistics (DAIS), Ca’ Foscari University of Venice, Via Torino 155, 30170, Venice, Italy; [email protected] (Y.T.); [email protected] (A.-S.J.); [email protected] (A.S.) * Correspondence: [email protected]; Tel.: +39-041 234 8621 Table S1. Water and sediment environmental parameters . Storga Morgano Treviso Summer Winter Summer Winter Summer Winter N-NH4 (µM) 0.95 1.58 1.12 1.54 1.68 1.82 N-NO3 (µM) 75.9 79.2 64.8 70.0 60.2 60.2 N-NO2 (µM) 0.19 0.48 0.42 0.27 0.70 0.41 DIN (µM) 77.1 81.3 67.4 71.8 62.6 64.5 P-PO4 (µM) 1.01 0.93 1.24 0.93 0.32 0.31 Water DO (mg/l) 14.5 11.9 10.1 13.3 10.3 13.7 DO (% ) 110 128 110 119 86 121 pH 7.90 7.80 7.9 7.7 7.6 7.7 TSS (mg/l) 5.60 4.10 8.00 11.30 24.20 7.20 Chl-a (µg/l) 1.91 1.77 2.67 2.14 1.12 0.95 pH 7.3 7.2 7.1 7.1 7.4 7.3 Sediment Eh (mV) 228.0 212.0 226.0 220.0 86.2 82.3 * N-NH4: ammonium, N-NO3: Nitrate; N-NO2: Nitrite, DIN: dissolved inorganic nitrogen, P-PO4: Citation: Buosi, A.; Tomio, Y.; Juh- reactive phosphorus, DO: dissolved oxygen, TSS: total suspended sediment, Chl-a: Chlorophyll- mani, A.-S.; Sfriso A. Ecosystem Or- a. ganic Carbon Stock Estimations in the Sile River, North Eastern Italy. Water 2020, 13, 77. https://doi.org/10.3390/w13010077 Received: 30 November 2020 Accepted: 28 December 2020 Published: 31 December 2020 Publisher’s Note: MDPI stays neu- tral with regard to jurisdictional claims in published maps and insti- tutional affiliations. Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and con- ditions of the Creative Commons At- tribution (CC BY) license (http://cre- ativecommons.org/licenses/by/4.0/). Water 2021, 13, 77. https://doi.org/10.3390/w13010077 www.mdpi.com/journal/water Water 2021, 13, 77 2 of 2 Table S2. Sediment grain size distribution with depth (% of Fines). Storga Morgano Treviso Summer Winter Summer Winter Summer Winter 0–5 cm 82.1 83.1 58.7 55.7 68.5 67.2 5–15 cm 82.3 82.7 20.7 22.0 52.6 60.1 15–25 cm 90.5 89.1 22.0 21.9 76.2 77.2 25–35 cm 94.7 94.0 77.1 79.2 72.9 72.8 Mean 87.4 87.2 44.6 44.7 67.6 69.3 Table S3: Sediment total nitrogen (TN) concentrations with depth (Mg TN ha−1). Storga Morgano Treviso Summer Winter Summer Winter Summer Winter 0-5 cm 0.73 0.81 0.57 0.46 0.98 0.54 5-15 cm 1.74 1.78 1.45 1.13 1.56 1.29 15-25 cm 1.54 1.48 1.75 1.22 1.62 1.10 25-35 cm 1.87 1.34 1.98 2.21 1.67 1.25 Total 5.87 5.41 5.75 5.02 5.83 4.18 Mean 1.47 1.35 1.44 1.26 1.46 1.05 .