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        ATLAS 
          Vegetation Studies: Seward Peninsula, Alaska 2000 [40.2 MB] Bockheim, 
          J.G., D.A. Walker, L.R. Everett, and Nelson, F.E. 1998. Soils and cryoturbation 
          in moist nonacidic and acidic tundra in the Kuparuk river basin, arctic 
          Alaska. Arctic and Alpine Research, 30: 166-174Chapin, 
          F.S., III, W. Eugster, J.P. McFadden, A.H. Lynch, and D.A. Walker. 2000. 
          Summer differences among arctic ecosystems in regional climate forcing. 
          J. Climate 13:2002-2010Epstein, 
          H.E., M.D. Walker, F.S. Chapin III and A.M. Starfield. 2000. [3.4 MB pdf] A transient, 
          nutrient-based model of arctic plant community response to climatic 
          warming. Ecological Applications 10(3): 824-841.Epstein, 
          H.E., F.S. Chapin III, M.D. Walker and A.M Starfield. 2001. [2.2 MB pdf] Analyzing 
          the functional type concept in arctic plants using a dynamic vegetation 
          model. Oikos 95: 239-252.Gould, 
          W.A., D.A. Walker, M. Raynolds, H. Maier, S. Edlund, and S. Zoltai. 
          2001 submitted. Canadian Arctic Vegetation Mapping. International Journal 
          of Remote Sensing. find: Jia 
          G.J., H.E. Epstein, D.A. Walker, J.C. Burian, H. Maier, M.K. Raynolds, 
          and S.M. Riedel, 2001, Patterns of NDVI in Arctic Tundra from Local 
          to Circumpolar Scales. Poster for the LAII All-hand Meeting.
Jia, 
          G.J., H.E. Epstein, D.A. Walker. 2002. Spatial characteristics 
          of AVHRR-NDVI along latitudinal transects in northern Alaska. Journal 
          of Vegetation Science. 13:315-326 5Jia, 
          G.J., H.E. Epstein and D.A. Walker. 2002. Intraseasonal patterns of 
          AVHRR-NDVI for the arctic tundra along latitudinal gradients in northern 
          Alaska. Submitted to International Journal of Remote Sensing.
        Jones, 
          M.H., J.T. Fahnestock, D.A. Walker, M.D. Walker, and J.M. Welker. 1998. 
          Carbon dioxide fluxes in moist and dry arctic tundra during the snow-free 
          season: Responses to increases in summer temperature and winter snow 
          accumulation. Arctic and Alpine Research, 30: 373-380.Markon, 
          C.J., and Walker, D.A., 2000, Proceedings of the 3rd International Circumpolar 
          Arctic Vegetation Mapping Workshop, U S Geological Survey Open File 
          Report 99-551.McGuire, 
          A.D, M. Apps, J. Beringer, J. Clein, H. Epstein, D.W. Kicklighter, C. 
          Wirth, J. Bhatti, F.S. Chapin III, B. de Groot, D. Efremov, W.Eugster, 
          M Fukuda, T. Gower, L. Hinzman, B. Huntley, G.J. Jia, E. Kasischke, 
          J. Melillo, V. Romanovsky, A. Shvidenko, E. Vaganov, D. Walker. 2002 
          In press. Environmental variation, vegetation distribution, carbon dynamics, and 
          water/energy exchange in high latitudes. Journal of Vegetation Science.
Muller, 
          S.V., D.A. Walker, F.E. Nelson, N.A. Auerbach, J.G. Bockheim, S. Guyer, 
          and D. Sherba. 1998. Accuracy assessment of a landcover map of the Kuparuk 
          River basin, Alaska: considerations for remote regions. Photogrammetric 
          Engineering and Remote Sensing, 64: 619-628.
Muller, 
          S. V., A. E. Racoviteanu and D. A. Walker, 1999 [1.5 MB pdf], Landsat MSS-derived 
          land-cover map of northern Alansak: extrapolation methods and a comparison 
          with photo-interpreted and AVHRR-derived maps. International Journal 
          of Remote Sensing 20 (15,16): 2921-2946.Ping, 
          C.L., J.G. Bockheim, J.M. Kimble, G.J. Michaelson, and D.A. Walker. 
          1998. Characteristics of cryogenic soils along a latitudinal ransect 
          in Arctic Alaska. Journal of Geophysical Research, 103 (D22): 28917-28928.Riedel, 
          S.M., H.E. Epstein, D.A. Walker, D.L. Richardson, M.P. Calef, E.J. Edwards, 
          and A. Moody. Spatial and temporal heterogeneity of LAI, NDVI and aboveground 
          net primary production for four tundra types in northern Alaska. Submitted 
          to Arctic, Antarctic and Alpine Research.
        Schickhoff, 
          U., M.D. Walker, D.A. Walker. 2002 in press. Riparian willow communities 
          on the Arctic Slope of Alaska and their environmental relationships: 
          A classification and ordination analysis. PhytocoenologiaShippert, 
          M.M., D.A. Walker, N.A. Auerbach, and B.E. Lewis. 1995. Biomass and 
          leaf area index maps derived from SPOT images for the Toolik Lake and 
          Imnavait Creek Area, Alaska. Polar Record, 31:147-154.Stow, 
          D., A. Hope, W. Boynton, S. Phinn, and D. Walker. [1.1 MB pdf] 1998. Satellite-derived 
          vegetation index and cover type maps for estimating carbon dioxide flux 
          for arctic tundra regions. Geomorphology, 21: 313-327.Walker, 
          D.A. and K.R. Everett. 1991. Loess ecosystems of northern Alaska: alkaline 
          tundra gradient and toposequence at Prudhoe Bay. Ecological Monographs, 
          6:437-464.Walker, 
          M.D., D. A. Walker, and N.A. Auerbach. 1994. Plant communties of a tussock 
          tundra landscape, Brooks Range foothills, Alaska. Journal of Vegetation 
          Science, 5:843-866.Walker, 
          D.A. et al. 1995. Toward a new arctic vegetation map: review of existing 
          maps. Journal of Vegetation Science, 6:427-436. Walker, 
          D.A. and C.J. Markon (eds). 1996. Circumpolar arctic vegetation mapping 
          workshop: abstracts and short papers. Open File Report No. 96-251, US 
          Geological Survey, Reston, Virginia.Walker, 
          D.A. and A.C. Lillie. 1997. Proceedings of the Second Circumpolar Arctic 
          Vegetation Mapping Workshop, Arendal, Norway, 19-24 May 1996 and the 
          CAVM-North American Workshop, Geological Survey, Reston, Virginia, pp. 
          100-112.Walker, 
          D.A., J.G. Bockheim, F.S. Chapin, W. Eugster, J.Y King, J. McFadden, 
          G.J. Michaelson. F.E. Nelson, W.C. Oechel, C.L. Ping. W.S. Reeburgh, 
          S. Regli, N.I. Shiklomanov, and G.L. Vourlitis. [496 kb pdf] 1998. Energy and 
          trace-gas fluxes across a soil-pH boundary in the Arctic. Nature, 394: 
          469-472.
Walker, 
          D.A. [1.7 MB pdf] 1999. An integrated vegetation mapping approach for northern 
          Alaska (4,000,000 scale). International Journal of Remote Sensing, 20: 
          2895-2920.Walker, 
          M.D., D.A. Walker, J.M. Welker, A.M. Arft, T. Bardsley, P.D. Brooks, 
          J.T. Fahnstock, M.H. Jones, M. Losleben, A.N. Parsons, T.R. Seastedt, 
          P.L. Turner. [800 kb pdf] 1999. Long-term experimental manipulation of winter 
          snow regime and summer temperature in arctic and alpine tundra. Hydrological 
          Processes, 13: 2315-2330.Walker, 
          D.A. 2000. Hierarchical subdivision of arctic tundra based on vegetation 
          response to climate, parent material, and topography. Global Change 
          Biology, 6: 19-34.Walker, 
          D.A., J.G. Molenaar, and W.D. Billings. 2001. Snow-vegetation interactions 
          in tundra environments. In: Jones, H.G., J. Pomeroy, D.A. Walker, and 
          R. Wharton (eds.) Snow Ecology. Cambridege: Cambridge University Press, 
          pp. 264-322.
Walker, 
          D.A., J.G. Bockheim, F.S. Chapin, F.E. Nelson, and C.L. Ping. [1.2 mb pdf] 2001. 
          Calcium-rich tundra, wildlife, and the Mammoth Steppe. Quaternary Science 
          Reviews, 20: 149-163.Walker, 
          D.A., H.E. Epstein, G.J. Jia, A. Balsar, C. Copass, E.J. Edwards, W.A. 
          Gould, J. Holllingsworth, J. Knudson, H. Meier, A. Moody, and M.K. Raynolds. 
          2002 in press. Phytomass, LAI, and NDVI in northern Alaska: relationships 
          to summer warmth, soil pH, plant functinal types and extrapolation to 
          the circumpolar Arctic. Journal of Geophysical Research - Atmospheres. 
          Walker, 
          D.A., W.A. Gould, M.K. Raynolds, H.A. Maier. In press, 2002. The Circumpolar 
          Arctic Vegetation Map: Environmental controls, AVHRR-derived base maps, 
          and integrated mapping procedures. International Journal of Remote Sensing.Weller, 
          G. F.S. Chapin, K.R. Everett, J.E. Hobbie, D. Kane, W.C. Oechel, C.L. 
          Ping, W.S. Reeburgh, D.Walker, J. Walsh. 1995. The arctic flux study: 
          a regional view of trace gas release. Journal of Biogeography 22, 365-374.
 
 
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