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ARS Home » Plains Area » El Reno, Oklahoma » Grazinglands Research Laboratory » Agroclimate and Natural Resources Research » Research » Research Project #433432

Research Project: Chronosequence Effects on Reservoir Sediment Carbon Thermal Stability, Composition, and Nutrient as Influenced by Runoff Deposition

Location: Agroclimate and Natural Resources Research

Project Number: 3070-13000-012-56-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Sep 1, 2017
End Date: Aug 31, 2019

1) To determine the influence of sediment profile depth on carbon thermal stability and C functional groups; 2) To determine the effects of sediment profile depth on nutrient composition (total nitrogen, total and available phosphorus and carbon, ammonium and nitrate); and 3) To determine the source of the sediment using isotopes.

A total of 120 samples, from already ten sediment cores already retrieved, will be analyzed for all parameters. A total of 120 samples will be analyzed for all parameters. Tentatively, the 120 samples will be selected from reservoirs located in grass, crop, and forest drainage areas (10 cores each approx. 1m cut in 25cm sections for 3 land use representative reservoirs = 10x 4x3). Basic parameters will be determined which will include; pH, moisture and loss on ignition. Carbon thermal stability will be determined using Multi-Element Scanning Thermal Analysis (MESTA). Carbon functional groups will be determined using solid 13C NMR. Total N and C and isotopes will be determined using mass spectrometry. Total and available phosphorus, ammonia and nitrates will be determined using AQ2 instrumentation.