Response of NDVI, biomass, and ecosystem gas exchange to long-term warming and fertilization in wet sedge tundra

Natalie T. Boelman, Marc Stieglitz, Heather M. Rueth, Martin Sommerkorn, Kevin L. Griffin, Gaius R. Shaver, John A. Gamon

Research output: Contribution to journalArticlepeer-review

188 Scopus citations

Abstract

This study explores the relationship between the normalized difference vegetation index (NDVI), aboveground plant biomass, and ecosystem C fluxes including gross ecosystem production (GEP), ecosystem respiration (ER) and net ecosystem production. We measured NDVI across long-term experimental treatments in wet sedge tundra at the Toolik Lake LTER site, in northern Alaska. Over 13 years, N and P were applied in factorial experiments (N, P and N + P), air temperature was increased using greenhouses with and without N + P fertilizer, and light intensity (photosynthetically active photon flux density) was reduced by 50% using shade cloth. Within each treatment plot, NDVI, aboveground biomass and whole-system CO2 flux measurements were made at the same sampling points during the peak-growing season of 2001. We found that across all treatments, NDVI is correlated with aboveground biomass (r2=0.84), GEP (r2=0.75) and ER (r2=0.71), providing a basis for linking remotely sensed NDVI to aboveground biomass and ecosystem carbon flux.

Original languageEnglish (US)
Pages (from-to)414-421
Number of pages8
JournalOecologia
Volume135
Issue number3
DOIs
StatePublished - May 2003
Externally publishedYes

Keywords

  • Aboveground biomass
  • Arctic tundra
  • Ecosystem respiration
  • Gross ecosystem production
  • Net ecosystem production

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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