![]() ![]() Air-dried soil from each horizon is archived and available for request. The Megapit Soil Archive is curated at the NEON program headquarters in Boulder, CO. Soil and root samples were collected to 2m at most sites because that depth range contains the vast majority of plant roots and soil organisms and is the location of most biogeochemical processes that influence, and are influenced by, the aboveground part of the ecosystem. Root samples were collected by depth increment, rather than horizon, in order to quantify root biomass distribution with depth. ![]() For soils, samples were collected from each horizon to characterize and archive the soil at the time of site construction. ![]() Megapit SamplesĪt all terrestrial sites NEON collected soil and root samples from a single, temporary soil pit called the 'megapit.' The pit location was selected to be in the locally dominant soil type surrounding the NEON tower based on available soil maps, accessible by a small excavator, and representative of the soil sensor locations. Additional archived soils from ongoing sampling activities can be requested through the NEON Biorepository. The Megapit and Distributed Initial Characterization Soil Archives provide access to archived soils collected at the time of NEON site construction.
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