UMBS DIRT Soil C:N from 2004 to 2014
Written by John Den Uyl (2/27/2018)

Soils sampled from 3 depths (Oea/A, 0-10 cm, 10-20 cm) for each of the 9 DIRT treatments. Soil bulk densities were calculated for years 2004 to 2009 for mineral soils (0-10 cm, 10-20 cm).

Includes plot level bulk densities of mineral soils for years 2004 to 2009.

Method for Mineral Soil Sampling
Written by Jim LeMoine (11/2004), John Den Uyl (7/2/2018)
Personnel involved: Jim LeMoine, Pat Micks, Knute Nadelhoffer

Samples were collected directly beneath the 3 respiration collars in each plot. We collected 3 0-10 cm mineral, and 3 10-20 cm mineral samples from each of the 27 plots.

Mineral: We used a 30 cm AMS stainless steel split corer with a slide hammer to collect the mineral samples from the same locations as the brownies were taken. Three 10 cm long clear plastic sleeves (7.62cm diameter) were placed in the core body. The corer was driven 20 cm into the soil, starting at the exposed mineral soil surface at the bottom of the brownie hole. The soil was moderately moist and held together well in the sampler. After the corer was opened, the 0-10 and 10-20 cm sections were separated slightly and the boundary between them cut with a knife. The two samples were bagged separately in ziploc bags. This procedure was followed for each of the three sampling locations in each plot.

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p>Mineral soils were run through a 2mm sieve, and all material <2mm was bagged, weighed, and dried in a drying oven at 105C. Bulk densities were calculated by dividing dry soil weights by the volume of each soil core.