Sediment Oxygen Demand and Biomass Estimate Sample Clauses

Sediment Oxygen Demand and Biomass Estimate. Initial modeling analyses suggest that SOD is an important contributor to low DO concentrations within the watershed. SOD sampling performed in 2011, using the preferred chamber method, was possible only in open patches on sand/mud or sand/gravel without significant amounts of submerged aquatic vegetation, so these measurements do not include the full SOD that may be exerted underneath Elodea mats. Total com- munity substrate oxygen demand (CSOD) measurements used to address this issue do not provide a full measurement of the oxygen demand exerted by the combination of sediment and decaying organic material within Elodea mats and are highly uncertain. SOD will be measured at four mainstem locations and each of the tributaries. SOD measurements included in the proposed monitoring program will be performed before and after Elodea removal activities, and in ar- eas both prone and not prone to Elodea growth. Both in situ and lab-based SOD measurements will be con- sidered. Based on previous experiences in Clarks Creek, high densities of Elodea are problematic for the de- ployment of in situ xxxxxxxx, and so sediment incubation in the laboratory may be the preferred technique. A biomass estimate will be performed in coordination with SOD sampling. Biomass, as quantified by ash-free dry mass (AFDM), will be measured at six representative sites on the mainstem of Clarks Creek and another six representative sites (total) on the tributaries. The biomass measurements will be based on macrophytes at Elodea-dominated sites and benthic algae at sites where macrophytes are not common. Field teams will estimate the percent coverage by different types of growth at each site.
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