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

Publication Type  Journal Article
Year of Publication  2003
Authors  Boelman, N. T.; Stieglitz, M.; Rueth, H. M.; Sommerkorn, M.; Griffin, K. L.; Shaver, G. R.; Gamon, J. A.
Journal Title  Oecologia
Volume  135
Issue  3
Pages  414-421
Journal Date  May
ISBN Number  0029-8549
Accession Number  ISI:000183198000013
Key Words  aboveground biomass; arctic tundra; ecosystem respiration; gross ecosystem production; net ecosystem production; simulated environmental-change; arctic tundra; carbon balance; co2 exchange; species composition; vegetation index; alaskan tundra; tussock tu
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 CO,! 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 (r(2)=0.84), GEP (r(2)=0.75) and ER (r(2)=0.71), providing a basis for linking remotely sensed NDVI to aboveground biomass and ecosystem carbon flux.

Notes  

684GXTimes Cited:22Cited References Count:54

URL  <Go to ISI>://000183198000013
DOI  DOI 10.1007/s00442-003-1198-3