Poster # 104. Steenwerth, Kerri^*,1, Jackson, Louise¹, Scow, Kate¹, ¹ University of California-Davis, Davis, Ca. Effects of vegetation and seasonality on microbial community structure and nitrogen dynamics.

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Poster # 105. Tolman, Deborah^*,1, ¹ Portland State University, Portland, OR Ecotones and gradients as determinants of Darlingtonia fen community structure: The roles of fire and soil and water nitrogen (NH₄ and NO₃).

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Poster # 106. PEREZ, CECILIA^*,1,2, CARMONA, MARTIN^1,2, ARAVENA, JUAN^1,2, ARMESTO, JUAN^1,2, ¹ UNIVERSIDAD DE CHILE, SANTIAGO, CHILE² FUNDACION SENDA DARWIN, CHILOE, CHILE Nitrogen availability and non-symbiotic nitrogen fixation in early and late successional forests in southern Chile.

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Poster # 107. Veluci, Roberta^*,1, Neher, Deborah^*,1, ¹ University of Toledo, Toledo, OH Microbiotic crust communities: Nitrogen fixation and leaching within a temperate oak savannah.

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Poster # 108. Gelinskey, Brian^*,1, McGonigle, Terence¹, ¹ Department of Biological Sciences, Pocatello, ID A test of field and laboratory extractions for soil mineral nitrogen.

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Poster # 109. BOYLE, SARAH^*,1, HART, STEPHEN¹, ¹ NORTHERN ARIZONA UNIVERSITY, FLAGSTAFF, ARIZONA Nitrogen and water limitations on soil microbial activity and function in northern Arizona ponderosa pine forests.

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Poster # 110. LECKIE, SARA^*,1, PRESCOTT, CINDY¹, NEUFELD, JOSH¹, MOHN, WILLIAM¹, ¹ University of British Columbia, Vancouver, BC, Canada Homogeneity of microbial communities in adjacent forests differing in nitrogen cycling.

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Poster # 111. ALLEN, HEATHER^*,1, GRAHAM, ROBERT¹, SILLETT, Stephen², ¹ UNIVERSITY OF CALIFORNIA, RIVERSIDE, Riverside, CA² HUMBOLT STATE UNIVERSITY, Arcata, CA Arboreal organic soils 50 m above the forest floor in coast redwood canopies.

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Poster # 112. Liptzin, Daniel^*,1, Seastedt, Timothy¹, ¹ University of Colorado, Boulder, CO The effects of trees on soil nutrients in the alpine forest-tundra ecotone.

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Poster # 113. DRINKWATER, LAURIE^*,1, ¹ Cornell University, Ithaca, NY Plant species and rhizosphere community effects on soil carbon cycling processes .

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Poster # 114. Rich, Elizabeth^*,1, ¹ Drexel University, Philadelphia, Pennsylvania The effect of activated carbon and three soil media on the growth of three perennials.

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Poster # 115. Gershenson, Alexander^*,1, ¹ University of California, Santa Cruz, CA The ecological role of root herbivory and its effect on carbon transfer between plants and soil: A review.

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Poster # 116. Mouratov, Stanislav², Steinberger, Yosef^*,1, ² Faculty of Life Science, Bar Ilan University, Ramat Gan, 52900, Ramat Gan, Israel, Israel¹ Faculaty of Life Sciences, Bar Ilan University, Ramat Gan, 52900, Ramat Gan, Israel, Israel Spatial distribution of nematode population along a temperature gradient in the Negev Desert ecosystem.

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