2009 LTER All Scientists Meeting - Movement of Inorganic Matter

The propagating response of inner shelf circulation to wind relaxations along the central California Coast

Libe Washburn — Thu, 10 Sep 2009 14:38:43 +0000

Poster Number:

395

Presenter/Primary Author:

Libe Washburn

Co-Authors:

Chris Melton

Co-Authors:

Melanie Fewings

Co-Authors:

Chris Gotschalk

Following relaxations prevailing equatorward winds, warm water from the Santa Barbara Channel flows poleward around Point Conception and along the central California coast. Sequences of satellite sea surface temperature images show the events as bands of warm water extending up to 20 km offshore. Characteristics of these flows were examined using time series of currents and temperature from an array of moorings along the inner shelf (15 m depth), a mooring on the mid-shelf (100 m depth), and surface current observations from high frequency radars.

Fate of N assimilated by stream biofilms: a benthic chamber study

Jonathan O'Brien — Wed, 09 Sep 2009 19:11:06 +0000

Poster Number:

391

Presenter/Primary Author:

Jonathan O'Brien

Co-Authors:

Steve Hamilton

Co-Authors:

Laura Podzikowski

Co-Authors:

Yi-Kuang Wang

Recent ¹⁵N tracing studies have highlighted the important role biotic assimilation plays in stream N retention, yet the fate of N following assimilation is not well understood. One potentially important fate is indirect denitrification, a process in which locally mineralized and nitrified N is denitrified before being exported to the water column. We conducted a series of in-situ chamber experiments in which patches of stream bottom were labeled with ¹⁵N to investigate the fate of assimilated N.

Niwot Ridge LTER Program: Alpine Ecosystems as Early Warning Systems

Mark Williams — Tue, 01 Sep 2009 17:42:43 +0000

Poster Number:

377

Presenter/Primary Author:

Mark Williams

Co-Authors:

Tim Seastedt

Co-Authors:

Diane McKnight

Co-Authors:

Alan Townsend

Co-Authors:

Bill Bowman

Co-Authors:

Steve Schmidt

Co-Authors:

Peter Blanken

The Niwot Ridge (NWT) LTER site was one of the five original LTER sites established in 1980. The LTER program is based at the University of Colorado-Boulder and is administered through the Institute of Arctic and Alpine Research (INSTAAR) and in cooperation with the Mountain Research Station, with special use permits from the US Forest Service.

Seasonal and spatial heterotrophic bacterial dynamics and phosphorus uptake and regeneration in Lake Mendota, WI

Emily Kara — Mon, 31 Aug 2009 23:01:21 +0000

Poster Number:

359

Presenter/Primary Author:

Emily Kara

Co-Authors:

Katherine D. McMahon

Bacteria community dynamics and metabolism are relevant to understanding the mechanism of phosphorus cycling in eutrophic lake systems. In Lake Mendota, WI, heterotrophic bacterial abundance as measured by catalyzed reporter deposition fluorescence in situ hybridization (CARD FISH), 33PO4-3 uptake and regeneration, 14C- leucine incorporation, alkaline phosphatase activity, and a suite of chemical analysis were measured during 2009 ice-off period in order to identify seasonal and spatial trends.

Student Poster:

Yes

Arctic LTER: Goals and Results

John Hobbie — Mon, 31 Aug 2009 20:38:57 +0000

Poster Number:

347

Presenter/Primary Author:

John Hobbie

Co-Authors:

George Kling

Co-Authors:

Chris Luecke

Co-Authors:

Gus Shaver

Co-Authors:

Anne Giblin

Co-Authors:

Donie Bret-Harte

The goal of the Arctic LTER is to predict the future ecological characteristics of Arctic Alaska based upon our knowledge of the controls of ecosystem structure and function as exerted by physical setting and geologic factors, climatic factors, biotic factors, and the changes in fluxes of water and materials from land to water.

Linking Carbon Quality to In-stream Nitrogen Processing, Boulder Creek, Colorado

Rebecca Barnes — Mon, 31 Aug 2009 18:49:27 +0000

Poster Number:

335

Presenter/Primary Author:

Rebecca Barnes

Co-Authors:

Richard L. Smith

Dissolved organic matter (DOM) dominates the material and energy fluxes within aquatic ecosystems. Carbon fuels the majority of microbial processes, including those that regulate in-stream nitrogen constituents. DOM sources and in situ transformations determine its chemical nature and lability within aquatic systems. Boulder Creek, which is located in the Colorado Front Range and spans an ecosystem gradient from the Continental Divide to the high plains, receives excess atmospheric nitrogen deposition due to its proximity to population centers and agricultural lands.

New techniques in soil sampling: methods for long-term ecological research

Carrie Rose Levine — Mon, 31 Aug 2009 15:22:46 +0000

Poster Number:

321

Presenter/Primary Author:

Carrie Rose Levine

Co-Authors:

Ruth D. Yanai

Co-Authors:

Steven P. Hamburg

Co-Authors:

Tyler K. Refsland

Imprecise, inaccurate, and inconsistent soil sampling techniques are a major source of uncertainty in the calculation of nutrient budgets. Traditional methods of soil sampling include soil coring and excavation of quantitative soil pits. The major problem encountered with soil coring is that rocky soils limit the location and depth of sampling, and therefore the soil volume is not accurately measured. Quantitative soil pits resolve the rock volume bias, but they are notoriously laborious and destructive, making repeated measurements difficult in spatially variable sites.

Student Poster:

Yes

A biogeochemical budget for iron at Hubbard Brook

Colin Fuss — Fri, 28 Aug 2009 20:11:57 +0000

Poster Number:

300

Presenter/Primary Author:

Colin Fuss

Co-Authors:

Charles T. Driscoll

Co-Authors:

Chris E. Johnson

Co-Authors:

Robert J. Petras

Co-Authors:

Timothy J. Fahey

Iron (Fe) is abundant among trace elements in forest ecosystems and important in the development and function of soils. We constructed a biogeochemical budget for Fe to better understand the behavior of Fe and its role in the development of Spodosols (podsolization). Fluxes of reduced (ferrous, Fe(II)) and oxidized (ferric, Fe(III)) iron draining through the soil profile were calculated.

Student Poster:

Yes

Consequences of increased N input in highly acid conditions of Western Tatra Mts. (Slovakia, Europe)

Lubos Halada — Wed, 26 Aug 2009 23:10:14 +0000

Poster Number:

278

Presenter/Primary Author:

Lubos Halada

Co-Authors:

Bowman, William D.

Co-Authors:

Zahora, Jaroslav

Co-Authors:

David, Stanislav

Co-Authors:

Tuma, Ivan

Co-Authors:

Halabuk, Andrej

Co-Authors:

Holub, Petr

The experimental research in Salatín (Western Tatra Mts., Slovakia) address the impact of nitrogen (N) deposition on ecosystem of alpine grasslands. The site was exposed during last 50 years to high acid deposition with maximum rates of wet deposition at least 15–20 kg N ha-1 yr-1 and 20–25 kg S ha-1 yr-1. The experiment consists of 5 replicated treatments: 20, 60, and 150 Kg N ha-1 yr-1, 50 Kg P ha-1 yr-1 and the control, 25 plots in total.

Separation of river network scale nitrogen removal between surface and hyporheic transient storage compartments

Robert Stewart — Mon, 24 Aug 2009 17:13:14 +0000

Poster Number:

270

Presenter/Primary Author:

Robert Stewart

Co-Authors:

W. M. Wollheim

Co-Authors:

M.A. Briggs

Co-Authors:

M.N. Gooseff

Co-Authors:

K.M. Morkeski

Co-Authors:

B.J. Peterson

Co-Authors:

C.S. Hopkinson

Co-Authors:

C.J. Vorosmarty

Reach scale experiments have shown that transient storage (TS) zones may be important controls on dissolved inorganic nitrogen (DIN) export to coastal waters. Here, we investigated the relative impact that main channel (MC), surface TS (STS) and hyporheic TS (HTS) have on DIN removal at the network scale using a DIN removal model applied to the Ipswich River in Massachusetts, USA.