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Frontiers of Earth Science

, Volume 11, Issue 3, pp 496–504 | Cite as

Effects of mountain pine beetle-killed forests on source water contributions to streamflow in headwater streams of the Colorado Rocky Mountains

  • Christine E. Wehner
  • John D. Stednick
Review Article

Abstract

Natural or human-influenced disturbances are important to the health and diversity of forests, which in turn, are important to the water quantity and quality exported from a catchment. However, human-induced disturbances (prescribed fire and harvesting) have been decreasing, and natural disturbances (fires and insects) have been increasing in frequency and severity. One such natural disturbance is the mountain pine beetle (MPB), (Dendroctonus ponderosae) an endemic species. A recent epidemic resulted in the mortality of millions of hectares of lodgepole pine (Pinus contorta) forests in Colorado, USA. Beetle-induced tree mortality brings about changes to the hydrologic cycle, including decreased transpiration and interception with the loss of canopy cover. This study examined the effect of the mountain pine beetle kill on source water contributions to streamflow in snowmeltdominated headwater catchments using stable isotopes (2H and 18O) as tracers. Study catchments with varying level of beetle-killed forest area (6% to 97%) were sampled for groundwater, surface water, and precipitation. Streams were sampled to assess whether beetle-killed forests have altered source water contributions to streamflow. Groundwater contributions increased with increasing beetle-killed forest area (p = 0.008). Both rain and snow contributions were negatively correlated with beetle-killed forest area (p = 0.035 and p = 0.011, respectively). As the beetle-killed forest area increases, so does fractional groundwater contribution to streamflow.

Keywords

mountain pine beetle isotope tracers streamflow generation headwaters 

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Notes

Acknowledgements

Support for this project was made available by the National Science Foundation grant 1204460: Water Quality and Supply Impacts from Climate-Induced Insect Tree Mortality. The work expands upon work done by Ariann Maggart and Ashley Menger. The authors also acknowledge the useful comments provided by the anonymous reviewers.

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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Watershed Science Program, College of Natural ResourcesColorado State UniversityFort CollinsUSA

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