Figure 1. The Arbutus Lake Watershed at Huntington Forest in the Adirondack Mountains of New York. Discharge from the whole watershed is gauged at the V-notch weir, while discharge from the Archer Creek subcatchment is gauged at the H-flume.

Figure 2. Temporal variations in the volume-weighted monthly mean concentrations of N compounds in precipitation, throughfall, and filter-pack air samples.

Figure 3. Temporal variations in the volume-weighted monthly mean concentrations of S compounds in precipitation and filter-pack air samples.

Figure 4. Temporal variations in the volume-weighted monthly mean concentrations of N and S compounds in drainage water from the Arbutus Lake outlet.

Figure 5. Temporal changes in the discharge-weighted annual mean concentrations of N and S solutes in drainage water from the Arbutus Lake outlet from 1983 through 2000.

Figure 6. Relationships between annual export of NO₃^- from the Arbutus watershed and annual mean temperature and total precipitation amounts.

Figure 7. Volume-weighted monthly mean concentrations of N and S compounds in air, precipitation, and discharge water from the Archer Creek from 1995 to 2000 (mean ± 1 SE).

Figure 8. Relationships between average daily air temperature and volume-weighted monthly mean concentrations of NH₄⁺, NO₃^-, DON, and SO₄^2- in discharge water from the Archer Creek during the period from 1995 to 2000. The line through the plot is the best fit regression line and statistical significance is indicated by R² followed by P values.

Figure 9. Monthly fluxes of water, inorganic and organic N, and inorganic S in wet-only precipitation (-?-), dry deposition(-?-), and discharge water(-¦-) from the Archer Creek during 6 years from 1995 to 2000 (mean ± 1 SE). Vertical bars represent net fluxes (wet deposition plus dry deposition minus drainage losses), and therefore positive and negative values indicate net retention or loss, respectively.

Figure 10. Changes in input-output mass balances of N and S depending on the inclusion of dry deposition and organic solutes. Positive or negative values of balance indicate a retention or loss of elements, respectively. Values above the balance bars indicate the proportion of retained or lost element in the input.

Figure 11. Pools (kg N or S ha^-1) and fluxes (kg N or S ha^-1 yr^-1) of N and S in the Archer Creek watershed. Inputs and outputs of N and S are 6-year (1995-2000) average fluxes from Table 2. Measurements of N pools, litterfall N, and N mineralization rates were done for some upslope areas of the Archer Creek (Ohrui and others 1999; Bischoff and others 2001). Data on S pools, litterfall S, and S mineralization are from a study conducted at a hardwood stand adjacent to the watershed (David and others 1987).

Figure 12. Relationships between the concentrations of SO₄^2- and Ca in drainage water from the Arbutus Lake outlet over the three time periods (1983-1989; 1990-1995; 1996-2001).

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 10.

Figure 12.