Poster # 155. Binkley, Dan^*,1, Stape, Jose^1,2, Ryan, Michael, ¹ Colorado State University, Fort Collins, CO² Universidade de Sao Paulo, Piracicaba, Sao Paulo, Brazil Geographic gradient in resource use efficiency in Eucalyptus plantations.

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Poster # 156. Leverett, Cara^*,1, Hooper, David¹, ¹ Western Washington University, Bellingham, WA The effects of reed canarygrass on riparian nutrient dynamics.

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Poster # 157. GRESS, STEPHEN^*,1, PETERJOHN, WILLIAM¹, ¹ West Virginia University, Morgantown, WV Phosphomonoesterase activity in violets (Viola rotundifolia) found in watersheds exhibiting varying levels of nitrogen availability.

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Poster # 158. Holland, Keri^*,1, Townsend, Alan¹, Snyder, Carolyn², Bowman, William¹, ¹ University of Colorado, Boulder, CO² Amherst College, Amherst, MA Phosphorus availability limits nitrogen fixation across an alpine tundra soil age gradient.

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Poster # 159. STARK, JOHN^*,1, SAETRE, PETER¹, ¹ Utah State University, Logan, Utah How does summer precipitation affect soil N and C cycling? Differences between cheatgrass and sagebrush soils.

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Poster # 160. Lane, Diana^*,1, BassiriRad, Hormoz¹, ¹ University of Illinois-Chicago, Chicago, IL Nitrogen enrichment in ant mounds varies across a prairie restoration chronosequence.

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Poster # 161. Matzek, Virginia^*,1, Vitousek, Peter¹, ¹ Stanford University, Stanford, CA Nitrogen fixation in bryophytes, lichens, and dead wood along a soil-age gradient in Hawaii.

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Poster # 162. LAUBER, CHRISTIAN^*,1, HOOSTAL, MATT¹, FINDLAY, STUART², SINSABAUGH, ROBERT¹, ¹ University of Toledo, Toledo, OH² Institute for Ecosystem Studies, Millbrook, NY Microbial community structure, function and metabolism in relation to DOM dynamics in hyporheic sediments .

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Poster # 163. LeBauer, David^*,1, Okano, Yutaka¹, Scow, Kate¹, Jackson, Louise¹, ¹ University of California at Davis, Davis, Ca Correlating gross nitrification rates with population dynamics of ammonia oxidizers in soil.

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Poster # 164. HICKS, WILLIAM^*,1, HARMON, MARK¹, OHMANN, JANET², GREGORY, MATTHEW¹, BERRYMAN, SHANTI¹, MARTIN, ERIN¹, GEISER, LINDA³, ¹ Oregon State University, Corvallis, OR² USDA Forest Service, Corvallis, OR³ USDA Forest Service, Corvallis, OR Mapping the abundance and activity of two symbiotic nitrogen fixers in western Oregon.

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Poster # 165. Yanai, Ruth^*,1, Sherman, Ruth², Lucash, Melissa¹, McFarlane, Karis¹, Joslin, J. Devereux³, ¹ SUNY-ESF, Syracuse, NY² Cornell University, Ithaca, NY³ Belowground Forest Research, Oak Ridge, TN What root parameters best predict nutrient uptake?

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Poster # 166. Chapman, Samantha^*,1,2, Classen, Aimee^1,2, Hart, Stephen^2,3, Koch, George^1,2, ¹ Department of Biological Sciences, Flagstaff, AZ² Merriam-Powell Center for Environmental Research, Flagstaff, AZ³ College of Ecosystem Science and Management, Flagstaff, AZ Two insect herbivores alter above- and below-ground litter decomposition and nutrient release.

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Poster # 167. Bailey, Scott^*,1, ¹ USDA Forest Service, Campton, NH Distribution of a calcicole fern on granitic substrate in New Hampshire: implications for nutrient cycling studies.

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Poster # 169. SEHTIYA, HARBANS^*,1,2, SILIM, SALIM¹, BASSIRIRAD, HORMOZ¹, ¹ University of Illinois at Chicago, Chicago, IL² Hariyana Agricultural University, RRS, Karnal, India Nitrate loading alters NH₄⁺, glutamine, glycine and glucosamine uptake capacity in conifer roots.

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