A5026619360- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Plant Water Relations and Carbon Dynamics
- Fire effects on ecosystems
- Cryospheric studies and observations
- Peatlands and Wetlands Ecology
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Soil Carbon and Nitrogen Dynamics
- Climate variability and models
- Forest ecology and management
- Groundwater and Isotope Geochemistry
- Tree-ring climate responses
- Forest Ecology and Biodiversity Studies
- Forest Management and Policy
- Ecology and Vegetation Dynamics Studies
- Rangeland and Wildlife Management
- Soil erosion and sediment transport
- Hydrology and Sediment Transport Processes
- Groundwater flow and contamination studies
- Tree Root and Stability Studies
- Geology and Paleoclimatology Research
- Remote Sensing and LiDAR Applications
- Soil and Unsaturated Flow
- Archaeology and Natural History
Northern Research Station
2016-2025
US Forest Service
2013-2022
United States Department of Agriculture
2007-2022
Dartmouth College
2021-2022
Dartmouth Hospital
2021
Oregon State University
2008-2020
Case Western Reserve University
2020
Pacific Southwest Research Station
2009
Syracuse University
2009
University of Maine
2009
Source, transformation, and preservation mechanisms of dissolved organic matter (DOM) remain elemental questions in contemporary marine aquatic sciences represent a missing link models global cycles. Although the chemical character DOM is central to its fate carbon cycle, characterizations long‐term ecological research programs are rarely performed. We analyzed variability quality 134 samples collected from 12 Long Term Ecological Research stations by quantification nitrogen concentration...
Abstract Forest development following stand‐replacing disturbance influences a variety of ecosystem processes including carbon exchange with the atmosphere. On series ponderosa pine ( Pinius var. Laws.) stands ranging from 9 to> 300 years in central Oregon, USA, we used biological measurements to estimate storage vegetation and soil pools, net primary productivity (NPP) (NEP) examine variation stand age. Measurements were made on plots representing four age classes three replications:...
Logging to "salvage" economic returns from forests affected by natural disturbances has become increasingly prevalent globally. Despite potential negative effects on biodiversity, salvage logging is often conducted, even in areas otherwise excluded and reserved for nature conservation, inter alia because strategic priorities post-disturbance management are widely lacking.A review of the existing literature revealed that most studies investigating biodiversity have been conducted less than 5...
Abstract Background In forests subject to stand‐replacing disturbances, conventional models of succession typically overlook early‐seral stages as a simple re‐organization/establishment period. These treat structural development in essentially ‘relay floristic’ terms, with complexity (three‐dimensional heterogeneity) developing primarily old‐growth stages, only after closed‐canopy ‘self‐thinning’ phase and subsequent canopy gap formation. However, is it possible that early‐successional can...
Whole ecosystem carbon dioxide (CO 2 ) exchange estimated with the eddy covariance (EC) technique has been central to studies on responses of terrestrial ecosystems disturbance and intra‐annual interannual variations in climate, but challenges exist understanding reducing uncertainty estimates net (NEE) CO . We review potential uncertainties associated technique, including systematic errors from insensitivity high‐frequency turbulence, random inadequate sample size averaging period, vertical...
Abstract Climate warming is projected to affect forest water yields but the effects are expected vary. We investigated how type and age yield resilience climate warming. To answer this question, we examined variability in historical at long‐term experimental catchments across Canada United States over 5‐year cool warm periods. Using theoretical framework of Budyko curve, calculated on annual partitioning precipitation ( P ) into evapotranspiration ET yield. Deviation d was defined as a...
A critical component of assessing the impacts climate change on forest ecosystems involves understanding associated changes in biogeochemical cycling elements. Evidence from research northeastern North American forests shows that direct effects will evoke by altering plant physiology, productivity, and soil physical, chemical, biological processes. Indirect effects, largely mediated species composition, length growing season, hydrology, also be important. The case study presented here uses...
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Abstract Long‐term data from the Hubbard Brook Experimental Forest in New Hampshire show that air temperature has increased by about 1 °C over last half century. The warmer climate caused significant declines snow depth, water equivalent and cover duration. Paradoxically, it been suggested temperatures may result colder soils more soil frost, as warming leads to a reduction insulating during winter. one of longest records direct field measurements frost United States. Historical no long‐term...
Large-scale wildfires (∼10 4 –10 6 ha) have the potential to eliminate seed sources over broad areas and thus may lead qualitatively different regeneration dynamics than in small burns; however, after such events has received little study temperate forests. Following a 200 000 ha mixed-severity wildfire Oregon, USA, we quantified (1) conifer broadleaf stand-replacement patches 2 years postfire; (2) relative importance of isolation from (live trees) versus local site conditions controlling...
Abstract The depth and duration of snow pack is declining in the northeastern United States as a result warming air temperatures. Since insulates soil, decreased can increase frequency soil freezing, which has been shown to have important biogeochemical implications. One most notable effects freezing increased inorganic nitrogen losses from during following growing season. Decreased retention thought be due reduced root uptake, but not yet measured directly. We conducted 2‐year snow‐removal...
Climate change has the potential to alter streamflow regimes, having ecological, economic, and societal implications. In northeastern United States, it is unclear how climate may affect surface water supply, which of critical importance in this densely populated region. The objective study was evaluate impact on timing quantity at small watersheds Hubbard Brook Experimental Forest New Hampshire. site ideal for analysis because availability long‐term hydroclimatological records analyzing past...
Abstract We combine experimental and modeling results from a headwater catchment at the Hubbard Brook Experimental Forest (HBEF), New Hampshire, USA, to explore link between stream solute dynamics water age. A theoretical framework based on age dynamics, which represents general basis for characterizing transport scale, is here applied conservative weathering‐derived solutes. Based available information about hydrology of site, an integrated model was developed used compute hydrochemical...
Understanding the responses of terrestrial ecosystems to global change remains a major challenge ecological research. We exploited natural elevation gradient in northern hardwood forest determine how reductions snow accumulation, expected with climate change, directly affect dynamics soil winter frost, and indirectly microbial biomass activity during growing season. Soils from lower plots, which accumulated less experienced more temperature variability (and likely freeze/thaw events), had...
Winter is an understudied but key period for the socioecological systems of northeastern North American forests. A growing awareness importance winter season to forest ecosystems and surrounding communities has inspired several decades research, both across northern at other mid- high-latitude around globe. Despite these efforts, we lack a synthetic understanding how climate change may impact hydrological biogeochemical processes social economic activities they support. Here, take advantage...
Abstract Forests are increasingly affected by natural disturbances. Subsequent salvage logging, a widespread management practice conducted predominantly to recover economic capital, produces further disturbance and impacts biodiversity worldwide. Hence, naturally disturbed forests among the most threatened habitats in world, with consequences for their associated biodiversity. However, there no evidence-based benchmarks proportion of area be excluded from logging conserve We apply mixed...
Abstract We investigated variation in carbon stock soils and detritus (forest floor woody debris) chronosequences that represent the range of forest types US Pacific Northwest. Stands age from <13 to >600 years. Soil carbon, a depth 100 cm, was highest coastal Sitka spruce/western hemlock forests (36±10 kg C m −2 ) lowest semiarid ponderosa pine (7±10 ). Forests distributed across Cascade Mountains had intermediate values between 10 25 . stocks were best described as linear function...