Parent materials combine a history of volcanism, faulting, and glaciation. The park remains seismically active, with frequent earthquakes and many hydrothermal features. Vegetation includes a mosaic of forest, sagebrush-steppe and riparian bottomlands. At high elevations sub-alpine Pinus albicaulis, Pinus flexilis, Picea engelmannii, and Abies lasiocarpatransition to alpine habitats. Forests are dominated by Pinus contortaand Pseudotsuga menzeisiithroughout much of the part. Our sampling was focused on NEON plots at low elevations in the northern portion of the park, those supporting forests.
Annie Carlson, Research Coordinator for Yellowstone NP facilitated our sampling efforts, including on-site consultations. Amy Jacobs manages NEON operations for this domain and provided guidance on logistics and sampling.
Plot 07 is an oasis of Pseudotsuga menzeisiion a mountainside, surrounded by sagebrush steppe, with grasses in the understory. Bison frequent the site, possibly maintaining the grass understory. Residual charred boles indicate that the surrounding steppe replaced forest decades ago. There are some Pinus contorta and browsed Populus seedlings in surrounding steppe. Most of the 2018 cone crop (on trees) have started to open by sampling time.
Plot 20 is a 30-yr old even age Pinus contortastand dating from the 1988 burn. Cones are mostly closed, some just starting to open. The understory is grass, with no tree recruitment. This site is not yet included in maps below.
Plot 23 is an open Pseudotsuga menzeisiistand with snapped large trees and clumped recruitment. Pinus contorta is present but not abundant. The site burned 30 yrs ago in the 1988 fire. In additional to patchy recruitment, the understory includes sagebrush and grasses.
Plot 26 supports a sparse Pseudotsuga menzeisii canopy above patchy recruitment scattered Pinus contorta. There is substantial damage to tree crowns, especially the large Pseudotsuga menzeisii. The grass understory is littered with large tree boles.