A5027576315- Soil and Water Nutrient Dynamics
- Atmospheric chemistry and aerosols
- Hydrology and Watershed Management Studies
- Fish Ecology and Management Studies
- Groundwater and Isotope Geochemistry
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Water Quality and Resources Studies
- Water Quality and Pollution Assessment
- Marine and coastal ecosystems
- Smart Materials for Construction
- Peatlands and Wetlands Ecology
- Hydrology and Sediment Transport Processes
- Aquatic Invertebrate Ecology and Behavior
- Ecology and Vegetation Dynamics Studies
- Atmospheric and Environmental Gas Dynamics
- Soil erosion and sediment transport
- Species Distribution and Climate Change
- Fire effects on ecosystems
- Forest ecology and management
- Forest Ecology and Biodiversity Studies
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Plant Water Relations and Carbon Dynamics
- Geology and Paleoclimatology Research
Cary Institute of Ecosystem Studies
2015-2025
University of Connecticut
2015-2025
Australian National University
2009-2018
Association for the Sciences of Limnology and Oceanography
2014
Sorbonne Université
2014
Laboratoire d’Océanographie de Villefranche
2014
Ecologie Microbienne Lyon
2014
Laboratoire de Biologie du Développement de Villefranche-sur-Mer
2014
University of Virginia
1987-2014
Uppsala University
2011-2013
Nitrogen is a key element controlling the species composition, diversity, dynamics, and functioning of many terrestrial, freshwater, marine ecosystems. Many original plant living in these ecosystems are adapted to, function optimally in, soils solutions with low levels available nitrogen. The growth dynamics herbivore populations, ultimately those their predators, also affected by N. Agriculture, combustion fossil fuels, other human activities have altered global cycle N substantially,...
Variations of sediment organic phosphorus and carbon during the outbreak decline algal blooms in Lake Taihu, China,
An annual energy budget is presented for Bear Brook, a small undisturbed second—order stream in northeastern United States. The ecosystem approach, which all input and output fluxes of potential as organic matter are considered, used to describe the dynamics flow 1,700—m segment stream. system 6,039 Kcal/m 2 . Over 99% this allochthonous, from surrounding forested watershed or upstream areas. Autochthonous primary production by mosses accounts less than 1% total available ecosystem. Algae...
All vegetation on Watershed 2 of the Hubbard Brook Experimental Forest was cut during November and December 1965, regrowth inhibited for two years by periodic application herbicides. Annual stream—flow increased 33 cm or 39% first year 27 28% second above values expected if watershed were not deforested. Large increases in streamwater concentration observed all major ions, except NH 4 +, SO = HCO 3 — , approximately five months after deforestation. Nitrate concentrations 41—fold higher than...
Long-term data from the Hubbard Brook Experimental Forest, New Hampshire, suggest that although changes in stream pH have been relatively small, large quantities of calcium and magnesium lost soil complex exported by drainage water because inputs acid rain declines atmospheric deposition base cations. As a result, recovery streamwater chemistry response to any decreases will be delayed significantly.
Chloride concentrations are increasing at a rate that threatens the availability of fresh water in northeastern United States. Increases roadways and deicer use now salinizing waters, degrading habitat for aquatic organisms, impacting large supplies drinking humans throughout region. We observed chloride up to 25% concentration seawater streams Maryland, New York, Hampshire during winters, remaining 100 times greater than unimpacted forest summers. Mean annual increased as function...
Inland aquatic habitats occur world-wide at all scales from marshes, swamps and temporary puddles, to ponds, lakes inland seas; streams creeks rolling rivers. Vital for biological diversity, ecosystem function as resources human life, commerce leisure, waters are a vital component of life on Earth. The Encyclopedia Waters describes explains the basic features subject, water chemistry physics, biology creatures complex balance ecosystems varying size complexity. Used abused an essential...
The Global Precipitation Chemistry Project collects precipitation by event to determine composition and processes controlling it in five remote areas. Compositions (excluding sea‐salt) at St. Georges, Bermuda, were primarily controlled anthropogenic processes; compositions acidities San Carlos, Venezuela, Katherine, Australia, Poker Flat, Alaska, Amsterdam Island unknown mixtures of natural or processes. was acidic; average volume‐weighted pH values 4.8 for Bermuda; 5.0, Alaska; 4.9, Island;...
At present, acid rain or snow is falling on most of the northeastern United States. The annual acidity value averages about p H 4, but values between 2.1 and 5 have been recorded for individual storms. precipitation in this region apparently increased 20 years ago, increase may associated with augmented use natural gas installation particle-removal devices tall smokestacks. Only some ecological economic effects widespread introduction strong acids into systems are known at clearly they must...
The concentration, composition, and flux of dissolved organic carbon (DOC) were measured in the Hubbard Brook Valley, New Hampshire. Data on precipitation, throughfall, soil solution, streamside seeps, stream water, lake water are presented for 1976—1980. Characterization DOC included analysis phenolics, monomeric polymeric carbohydrates, carboxylic acids, primary amines, aldehydes. concentrations increased with passage through forest canopy floor, decreased due to abiotic sorption mineral...
Removal of all organic debris dams from a 175—m stretch second—order stream at the Hubbard Brook Experimental Forest in New Hampshire led to dramatic increase export carbon this ecosystem. Output dissolved (<0.50 μm) increased 18%. Fine particulate (0.50 μm—1 mm) 632% and coarse matter (>1 138%. Measurement standing stock on streambeds Valley revealed that were very important accumulating material. In first—order streams, contain nearly 75% matter. The proportion held by drops 58%...
Current knowledge of the world carbon budget is reviewed with special emphasis on question whether biota a source or sink for CO/sub 2/. The analysis shows through convergent lines evidence that not and may be 2/ as large larger than fossil fuel source. issue important because potential changes in content air have changing climate worldwide. Various analyses suggest human activities near future could release additional amounts into atmosphere results are substantially unpredictable.
Damage to ecosystems and threats human health the lack of effective mitigation require new approaches mining regulation.
Rates of weight loss and nutrient release (N, P, S, K, Mn, Ca, Zn, Fe, Cu, Na) were measured in decomposing leaf branch tissue form yellow birch, sugar maple, beech, from red spruce balsam fir. Neither nor decomposition differed significantly over an elevational range 220 m. Decomposition rates for leaves varied with birch > maple beech. The rate hardwood branches was greater than that conifer branches, but differences between hardwoods not significant. Maximum occurred during the summer...
A small watershed in the White Mountains of New Hampshire bearing mesophytic, cool—temperate, broadleaf—deciduous forests was studied. Acer saccharum, Betula lutea, and Fagus grandifolia are dominant, but toward higher elevations Picea rubens Abies balsamea also occur indicate transition subalpine climate. The stands young (following cutting 1909—17) contain older trees; stand composition is thought reasonably representative climax. For application Brookhaven system forest dimension...