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Long-Term Monitoring of the Forest Ecosystem at Cary

Lead Scientist(s): Dr Gary M Lovett


Click on the link to access each data set. If you wish to use these data sets, please email Gary Lovett, with a brief explanation of how you intend to use them.

Data set Start date Method
Gypsy moth egg mass density
metadata data .xls
1980 direct counts on sample plots
Nutrient Cycling    
Wet deposition 1984 wet-only collectors
Dry deposition 1988 filter packs + deposition velocity model
metadata .pdf data .xls
1993 (through 1999) funnel/bottle collectors
B horizon soil solution
metadata .pdf data .xls
1993 constant tension lysimeters
Potential N mineralization
metadata .pdf data .xls
1994 laboratory incubation
Foliar N concentration
metadata .pdf data .xls
1994 C-N analyzer


Julie Hart collecting soil solution using a suction lysimeter.

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).

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