Status: Past Project
Data
Click on the link to access each data set. If you wish to use these data sets, please email Gary Lovett, lovettg@caryinstitute.org with a brief explanation of how you intend to use them.
| Data set | Start date | Method |
| Gypsy moth egg mass density metadatadata .xls | 1980 | direct counts on sample plots |
| Nutrient Cycling | ||
| Wet deposition | 1984 | wet-only collectors |
| Dry deposition | 1988 | filter packs + deposition velocity model |
| Throughfall metadata .pdf data .xls | 1993 (through 1999) | funnel/bottle collectors |
| B horizon soil solution metadata .pdfdata .xls | 1993 | constant tension lysimeters |
| Potential N mineralization metadata .pdfdata .xls | 1994 | laboratory incubation |
| Foliar N concentration metadata .pdfdata .xls | 1994 | C-N analyzer |
Trends in Nitrogen and Sulfur Deposition
We have observed a decline in total (wet + dry) atmospheric deposition of both nitrogen (N) and sulfur (S) since we began measurements in 1988 (Kelly et al 2002). There have been corresponding declines in fluxes of N and S in throughfall and of S in soil leachate (see graphs below). The fact that S leaching is substantially higher than S deposition suggests that mineral weathering contributes S to this ecosystem. There is minimal leaching of N, suggesting almost complete retention of N under current deposition conditions. With addition of nitrogen through experimental fertilization, nitrate leaching is accelerated, the soils become acidified, and tree mortality increases (Wallace et al. 2007).
- Wallace, Z.P., G.M. Lovett, J.E. Hart, and B. Machona. 2007. Effects of nitrogen saturation on tree growth and death in a mixed-oak forest. Forest Ecology and Management 243:210-218.
- Lovett, G. M. and J. E. Hart. 2005. Monitoring the Deposition and Effects of Air Pollution in the Hudson Valley, NY. New York State Energy Research and Development Authority Report 05-01. NYSERDA, Albany, NY. 27 pp.
- Kelly, V.R., G.M. Lovett, K.C. Weathers and G.E Likens. 2002. Trends in atmospheric concentration and deposition compared to regional and local pollutant emissions at a rural site in southeastern New York, USA. Atmospheric Environment 36:1569-1575.
