Increased plant biomass in a high arctic heath community from 1981 to 2008

  • Hudson J
  • Henry G
  • 178


    Mendeley users who have this article in their library.
  • 137


    Citations of this article.


The Canadian High Arctic has been warming for several decades. Over this period, tundra plant communities have been influenced by regional climate change, as well as other disturbances. At a site on Ellesmere Island, Nunavut, Canada, we measured biomass and composition changes in a heath community over 13 years using a point-intercept method in permanent plots (1995-2007) and over 27 years using a biomass harvest comparison (1981-2008). Results from both methods indicate that the community became more productive over time, suggesting that this ecosystem is currently in transition. Bryophyte and evergreen shrub abundances increased, while deciduous shrub, forb, graminoid, and lichen cover did not change. Species diversity also remained unchanged. Because of the greater evergreen shrub cover, canopy height increased. From 1995 to 2007, mean annual temperature and growing season length increased at the site. Maximum thaw depth increased, while soil water content did not change. We attribute the increased productivity of this community to regional warming over the past 30-50 years. This study provides the first plot-based evidence for the recent pan-Arctic increase in tundra productivity detected by satellite-based remote-sensing and repeat-photography studies. These types of ground-level observations are critical tools for detecting and projecting long-term community-level responses to warming.

Author-supplied keywords

  • Climate change
  • ITEX
  • International tundra experiment
  • Primary production
  • Tundra
  • Warming.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • J. M.G. Hudson

  • G. H.R. Henry

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free