

Lecture Video
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 |
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).