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Determination of leaf area index, total foliar N, and normalized difference vegetation index for arctic ecosystems dominated by Cassiope tetragona

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Abstract
Leaf area index (LAI) and total foliar nitrogen (TFN) are important canopy characteristics and crucial variables needed to simulate photosynthesis and ecosystem CO2 fluxes. Although plant communities dominated by Cassiope tetragona are widespread in the Arctic, LAI and TFN for this vegetation type have not been accurately quantified. We address this knowledge gap by (i) direct measurements of LAI and TFN for C tetragona, and (ii) determining TFN-LAI and LAI-normalized difference vegetation index (NDVI) relationships for typical C tetragona tundras in the subarctic (Sweden) and High Arctic (Greenland and Svalbard). Leaves of C tetragona are 2-6 mm long and closely appressed to their stems forming parallelepiped shoots. We determined the LAI of C tetragona by measuring the area of the leaves while still attached to the stem, then doubling the resulting one-sided area. TFN was determined from leaf N and biomass. The LAI-NDVI and TFN-LAI relationships showed high correlation and can be used to estimate indirectly LAI and TFN. The LAI-NDVI relationship for C tetragona vegetation differed from a generic LAI-NDVI relationship for arctic tundra, whereas the TFN-LAI relationship did not. Overall, the LAI of C tetragona tundra ranged from 0.4 to 1.1 m(2) m(-2) and TFN from 1.4 to 1.7 g N m(-2).
Keywords
DWARF SHRUBS, ENVIRONMENTAL PERTURBATIONS, CO2 FLUX, RESPONSES, NUTRIENT, EXCHANGE, GROWTH, PLANTS, PRODUCTIVITY, TEMPERATURE

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Chicago
Campioli, Matteo, Lorna E Street, Anders Michelsen, Gaius R Shaver, Thomas Maere, Roeland Samson, and Raoul Lemeur. 2009. “Determination of Leaf Area Index, Total Foliar N, and Normalized Difference Vegetation Index for Arctic Ecosystems Dominated by Cassiope Tetragona.” Arctic Antarctic and Alpine Research 41 (4): 426–433.
APA
Campioli, M., Street, L. E., Michelsen, A., Shaver, G. R., Maere, T., Samson, R., & Lemeur, R. (2009). Determination of leaf area index, total foliar N, and normalized difference vegetation index for arctic ecosystems dominated by Cassiope tetragona. ARCTIC ANTARCTIC AND ALPINE RESEARCH, 41(4), 426–433.
Vancouver
1.
Campioli M, Street LE, Michelsen A, Shaver GR, Maere T, Samson R, et al. Determination of leaf area index, total foliar N, and normalized difference vegetation index for arctic ecosystems dominated by Cassiope tetragona. ARCTIC ANTARCTIC AND ALPINE RESEARCH. 2009;41(4):426–33.
MLA
Campioli, Matteo, Lorna E Street, Anders Michelsen, et al. “Determination of Leaf Area Index, Total Foliar N, and Normalized Difference Vegetation Index for Arctic Ecosystems Dominated by Cassiope Tetragona.” ARCTIC ANTARCTIC AND ALPINE RESEARCH 41.4 (2009): 426–433. Print.
@article{898717,
  abstract     = {Leaf area index (LAI) and total foliar nitrogen (TFN) are important canopy characteristics and crucial variables needed to simulate photosynthesis and ecosystem CO2 fluxes. Although plant communities dominated by Cassiope tetragona are widespread in the Arctic, LAI and TFN for this vegetation type have not been accurately quantified. We address this knowledge gap by (i) direct measurements of LAI and TFN for C tetragona, and (ii) determining TFN-LAI and LAI-normalized difference vegetation index (NDVI) relationships for typical C tetragona tundras in the subarctic (Sweden) and High Arctic (Greenland and Svalbard).
Leaves of C tetragona are 2-6 mm long and closely appressed to their stems forming parallelepiped shoots. We determined the LAI of C tetragona by measuring the area of the leaves while still attached to the stem, then doubling the resulting one-sided area. TFN was determined from leaf N and biomass. The LAI-NDVI and TFN-LAI relationships showed high correlation and can be used to estimate indirectly LAI and TFN. The LAI-NDVI relationship for C tetragona vegetation differed from a generic LAI-NDVI relationship for arctic tundra, whereas the TFN-LAI relationship did not. Overall, the LAI of C tetragona tundra ranged from 0.4 to 1.1 m(2) m(-2) and TFN from 1.4 to 1.7 g N m(-2).},
  author       = {Campioli, Matteo and Street, Lorna E and Michelsen, Anders and Shaver, Gaius R and Maere, Thomas and Samson, Roeland and Lemeur, Raoul},
  issn         = {1523-0430},
  journal      = {ARCTIC ANTARCTIC AND ALPINE RESEARCH},
  keyword      = {DWARF SHRUBS,ENVIRONMENTAL PERTURBATIONS,CO2 FLUX,RESPONSES,NUTRIENT,EXCHANGE,GROWTH,PLANTS,PRODUCTIVITY,TEMPERATURE},
  language     = {eng},
  number       = {4},
  pages        = {426--433},
  title        = {Determination of leaf area index, total foliar N, and normalized difference vegetation index for arctic ecosystems dominated by Cassiope tetragona},
  url          = {http://dx.doi.org/10.1657/1938-4246-41.4.426},
  volume       = {41},
  year         = {2009},
}

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