2009 LTER All Scientists Meeting - HBR

Comparison of soil respiration in young and old forests in the White Mountains of New Hampshire

Kikang Bae — Tue, 01 Sep 2009 03:33:04 +0000

Poster Number:

367

Presenter/Primary Author:

Kikang Bae

Co-Authors:

TImothy J. Fahey

Co-Authors:

Ruth D. Yanai

Co-Authors:

Byung Bae Park

Soil respiration is a major pathway of flux in the terrestrial ecosystem carbon cycle and has received a great deal of attention recently. This is largely because even a small change in soil respiration can exacerbate the annual input of CO2 into the atmosphere. Soil respiration represents the combined respiration of roots and soil micro- and macro-organisms, and a number of studies on soil respiration have been undertaken in a variety of ecosystems.

Student Poster:

Yes

Modeling Hydrochemical Responses to Climate Change at the Hubbard Brook Experimental Forest over the 21st Century Using a Dynamic Biogeochemical Model (PnET-BGC)

Afshin Pourmokhtarian — Mon, 31 Aug 2009 23:46:24 +0000

Poster Number:

360

Presenter/Primary Author:

Afshin Pourmokhtarian

Co-Authors:

Charles T. Driscoll

Co-Authors:

John L. Campbell

Dynamic biogeochemical watershed models are the only practical approach that can predict concurrent exposure to multiple environmental factors and consider interactive effects between climate change, atmospheric deposition and CO2 fertilization effect. Therefore, they could be powerful tools to help to understand the long-term effects of climate change on ecosystems.

Student Poster:

Yes

MIRADA-LTERS

Linda Amaral-Zettler — Mon, 31 Aug 2009 15:45:14 +0000

Poster Number:

323

Presenter/Primary Author:

Linda Amaral-Zettler

Co-Authors:

McCliment, Elizabeth

Co-Authors:

Huse, Susan

The MIRADA project was launched in the fall of 2007 to establish a Microbial Biodiversity Survey and Inventory across all 13 of the major aquatic (marine and freshwater) Long Term Ecological Research (LTER) sites in the NSF US LTER Program. The long-term objective of our study is to document and describe baseline diversity and relative abundance data for both common and rare members of microbial communities and to relate this diversity to the underlying physical and chemical environment.

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

The EcoTrends Project: preview of the book and introduction to the web site

Debra Peters — Tue, 25 Aug 2009 15:46:43 +0000

Poster Number:

274

Presenter/Primary Author:

Debra Peters

Co-Authors:

Christine Laney

Co-Authors:

Ariel Lugo

Co-Authors:

Scott Collins

Co-Authors:

Charley Driscoll

Co-Authors:

Peter Groffman

Co-Authors:

Morgan Grove

Co-Authors:

Alan Knapp

Co-Authors:

Tim Kratz

Co-Authors:

Mark Ohman

Co-Authors:

Bob Waide

Co-Authors:

Jin Yao

Co-Authors:

Mark Servilla

The EcoTrends Project began in 2004 as a joint collaboration among the LTER Program, USDA Agricultral Research Service, and the USDA Forest Service with two goals: (1) to create a book illustrating trends in long -term data and showing the value of long-term data across a network of sites in addressing continental-scale questions, and (2) to make long-term biotic and abiotic data easily accessible through a common web interface with a focus on derived or aggregated data to allow cross-site analyses to be made.

Local Scale Carbon Budgets and Mitigation Opportunities for the Northeastern United States

Steve Raciti — Mon, 24 Aug 2009 17:08:20 +0000

Poster Number:

269

Presenter/Primary Author:

Steve Raciti

Co-Authors:

Timothy Fahey

Co-Authors:

Charles Driscoll

Co-Authors:

David Foster

Co-Authors:

Christine Goodale

Co-Authors:

Brian Hall

Co-Authors:

Jennifer Jenkins

Co-Authors:

Julian Jenkins

Co-Authors:

Steven Hamburg

Co-Authors:

Richard McHorney

Co-Authors:

Christopher Neill

Co-Authors:

Scott Ollinger

Co-Authors:

Erin Quigley

Co-Authors:

Ruth Sherman

Co-Authors:

R. Quinn Thomas

Co-Authors:

David Weinstein

Co-Authors:

Peter Woodbury

Co-Authors:

William Yandik

With recent shifts in public attitudes across the United States concerning the problem of global climate change, momentum is building for aggressive action to mitigate greenhouse gas emissions. At the same time, the ongoing economic recession presents challenges for financing an aggressive climate change abatement campaign; hence, it is imperative that cost-effective strategies for reducing greenhouse gas emissions be identified and pursued. To accomplish this, policy instruments will need to be tailored to a complex range of local and regional conditions.

Student Poster:

Yes

Is P more limiting than N in young northern hardwood forests?

Melany Fisk — Wed, 19 Aug 2009 19:56:12 +0000

Poster Number:

242

Presenter/Primary Author:

Melany Fisk

Co-Authors:

Tera Ratliff, Ruth Yanai, Ed Rastetter, Brendan Naples, Tim Fahey, Farrah Fatami, Steve Hamburg

Although temperate forests have long been thought to be primarily nitrogen limited, resource optimization theory suggests that ecosystem productivity should be co-limited by multiple nutrients. In northeastern North America, air pollution and forest harvesting disturbance elevate N availability and contribute to the likelihood of P limitation.

Climate-induced changes in streamflow at the Hubbard Brook Experimental Forest

John Campbell — Tue, 18 Aug 2009 19:20:48 +0000

Poster Number:

225

Presenter/Primary Author:

John Campbell

Co-Authors:

Charles T. Driscoll

Co-Authors:

Afshin Pourmokhtarian

Long-term data from the Hubbard Brook Experimental Forest show that air temperature has increased by 1-1.5 °C over the last half century. While more variable, annual precipitation has also increased by 19-26% during the same period. These changes in climate influence streamflow, which provides an integrated climate signal that incorporates physical (snowpack, evaporation) and biological (evapotranspiration) responses. Unlike the western United States, water is generally abundant in the Northeast.

Long-term forest floor data and the changing nitrogen budget at Hubbard Brook’s Watershed 6

Matthew Vadeboncoeur — Mon, 27 Jul 2009 13:27:55 +0000

Poster Number:

183

Presenter/Primary Author:

Matthew Vadeboncoeur

Co-Authors:

Ruth D. Yanai

Co-Authors:

Steven P. Hamburg

Co-Authors:

Mary A. Arthur

Co-Authors:

Colin B. Fuss

Co-Authors:

Thomas G. Siccama

Co-Authors:

Christine L. Goodale

Co-Authors:

Peter M. Groffman

Analysis of twenty-five years of forest floor sampling on Watershed 6 (W6) at the Hubbard Brook Experimental Forest (Woodstock, NH, USA) shows no significant evidence of N accumulation in the forest floor (O horizon). The uncertainty in this estimate is high (2 ± 19 kg N ha^-1 y^-1) due to large spatial variation in forest floor mass, as well as interannual effects that can bias sampling depth. However, the C:N ratio of the forest floor has increased slightly (p = 0.05), which is unexpected under the “N saturation” hypothesis.

Student Poster:

Yes