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- Title
Response of NDVI, biomass, and ecosystem gas exchange to long-term warming and fertilization in wet sedge tundra.
- Authors
Boelman, Natalie T.; Stieglitz, Marc; Rueth, Heather M.; Sommerkorn, Martin; Griffin, Kevin L.; Shaver, Gaius R.; Gamon, John A.
- 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.
- Subjects
PLANT biomass; BIOTIC communities; CAREX; TUNDRA ecology
- Publication
Oecologia, 2003, Vol 135, Issue 3, p414
- ISSN
0029-8549
- Publication type
Article
- DOI
10.1007/s00442-003-1198-3