Reclamation is not the primary determinant of soil recovery from oil and gas development in Wyoming sagebrush systems.
Rottler, C., Burke, I. C., & Lauenroth, W. K.. 2019.
Abstract
Dryland soils store approximately 10-15% of the world%u2019s soil organic matter (SOM) to 1 m.
Threats to carbon stocks in global dryland soils include cultivation, overgrazing, urbanization,
and energy development. To limit loss of carbon from these soils, it is important to understand,
first, how disturbances affect SOM and second, how SOM recovers after disturbance. In this
study, we address current gaps in our understanding of the effects of oil and gas development
and reclamation on SOM in the sagebrush steppe of Wyoming, a cold temperate shrub-
dominated dryland. Most studies have found that soil disturbance, including from the respreading
of topsoil during wellpad reclamation, is damaging to SOM stores; however, research on ~80
year old unreclaimed oil and gas wellpads found no difference in SOM between wellpads and
undisturbed sites. Using a chronosequence approach and paired study design, we evaluated the
effects of reclamation on SOM by comparing undisturbed sites to wellpads where reclamation
activities either had or had not occurred. Our results suggest that the most important factor in
recovery of SOM after disturbance in this area was not the presence or absence of reclamation,
but time since wellpad abandonment and spatial heterogeneity of plants. Further study on the
effectiveness of different reclamation techniques is warranted if the goal of reclamation is to aid
SOM recovery and prevent further C loss from these systems.
