The Effect of Landscape Features on Deposition to Hunter Mountain, Catskill Mountains, New York

The phosphorus status of northern hardwoods differs by species but is unaffected by nitrogen fertilization

“…In Ontario sugar maple stands, Gradowski and Thomas (2006) linked sugar maple diameter growth to P availability and suggested that P limitation was the result of increased biotic demand under Nsufficient conditions. Those stands receive N inputs of 20 kg N ha -1 year -1 , greater than the ambient deposition rate in our study sites ( * 11 kg N ha -1 year -1 ), although local landscape features may result in deposition rates in excess of 40 kg N ha -1 year -1 within the Catskill Mountains (Weathers et al 2000). Where P limitation has been suggested as a cause of poor sugar maple regeneration (Pare and Bernier 1989a), foliar P concentrations were on average lower (1.00 mg g -1 ) than those found here (1.25 mg g -1 ) or in the FCD-NERC data (1.15 mg g -1 ).…”

“…Total (wet ? dry) atmospheric N deposition in the Catskill Mountains varies across the landscape up to 4-fold (Weathers et al 2000), but ambient N deposition in this area is roughly 11 kg N ha -1 year -1 (NADP http://nadp.sws.uiuc.edu; CASTNET http://www.epa. gov/castnet).…”

Comparisons of watershed sulfur budgets in southeast Canada and northeast US: new approaches and implications

“…Relatively accurate estimates can be made for ''wet only'' (or bulk) atmospheric S inputs and drainage water losses (Likens and Bormann 1995;Mitchell et al 2001b;Likens et al 2002) although there can be considerable variability of wet and total deposition across landscapes (Ito et al 2002;Weathers et al 2000Weathers et al , 2006b. Comparisons of wet only and bulk S deposition estimates have generally found these measurements to be very similar in most studies (Shepard et al 1989;Martin et al 2000;Likens et al 2002) although others have found some differences (Richter and Lindberg 1988;Staelens et al 2005).…”

“…Regional air quality models such as A Unified Regional Air-quality Modeling System (AURAMS) (Moran et al 2008;Smyth et al 2007Smyth et al , 2008 and the Community Multiscale Air Quality model (CMAQ; Byun and Schere 2006) provide the spatial estimates of deposition, but there are limited data from multi-year studies from these regional models. Direct deposition of cloud droplets to vegetation surfaces (cloud water deposition) can also contribute substantially to atmospheric S inputs at some sites, especially those at high elevations (Lovett et al 1982;Lovett 1984;Weathers et al 1995Weathers et al , 2000Weathers et al , 2006bBaumgardner et al 2003;Sickles and Grimm 2003). However, because of a lack of data and the limited area affected by the watersheds used in our study, we will not address this component of deposition in our paper.…”

Plant and soil natural abundance δ 15N: indicators of relative rates of nitrogen cycling in temperate forest ecosystems

“…Knowing which ecosystems have inherently high rates of soil N cycling would enable scientists and land managers to focus their attention on forest stands or regions that may be most susceptible to saturation. Forests in the Catskill Mountains receive among the highest inputs of N deposition in the northeastern United States (Ollinger et al 1993;Stoddard 1994;Weathers et al 2000), but the fate of deposited N varies signiWcantly among stands of diVerent tree species (Templer et al 2005). For example, the forest Xoor of red oak-dominated forests has greater N retention than the forest Xoor of sugar maple-dominated forests (Templer et al 2005), which can be partially explained by diVerences in soil nitriWcation rates.…”