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Recent Changes in Soil Chemistry in a Forested Ecosystem of Southern Québec, Canada

^a Dép. de Géographie, Univ. de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, QC, Canada, H3C 3J7
^b Dep. of Natural Resource Sciences, Macdonald Campus, McGill Univ., 21 111 Lakeshore Road, Ste.-Anne de Bellevue, QC, Canada, H9X 3V9
^c Dep. of Geography, Concordia Univ., 1455 de Maisonneuve W., Montréal, QC, Canada, H3G 1M8

View larger version (45K): [in a new window]   Fig. 1. Sulfate, Ca, Mg, H+, K, and Na concentrations in the solutions collected under the LFH horizons of the Hermine watershed for the period 1994 to 2002, inclusively. The lines represent the simple linear regression for the data of each of the three zones (Zone A: dashed line; Zone B: dotted line; and Zone C: full line).

View larger version (37K): [in a new window]   Fig. 2. Sulfate, Ca, Mg, H+, K, and Na concentrations in the solutions collected in the B horizons of the Hermine watershed for the period 1994 to 2002, inclusively. The lines represent the simple linear regression for the data of each of the three zones (Zone A: dashed line; Zone B: dotted line; and Zone C: full line).

View larger version (39K): [in a new window]   Fig. 3. Soil pH in water (pH H2O), and exchangeable Ca (Caex), Mg (Mgex), Mn (Mnex), Al (Alex), and K (Kex) in the FH horizons of the Hermine watershed for the period 1994 to 2002, inclusively. The lines represent the simple linear regression for the data of each of the three zones (Zone A: dashed line; Zone B: dotted line; and Zone C: full line).

View larger version (41K): [in a new window]   Fig. 4. Soil pH in water (pH H2O); exchangeable Ca (Caex), Mg (Mgex), Mn (Mnex) and Al (Alex); and H2O-soluble SO4 (SO4–H2O) in the B horizons of the Hermine watershed for the period 1993 to 2002, inclusively. The lines represent the simple linear regression for the data of each of the three zones (Zone A: dashed line; Zone B: dotted line; and Zone C: full line).

View larger version (41K): [in a new window]   Fig. 5. Mean exchangeable Ca (Caex), Mg (Mgex), Mn (Mnex), Al (Alex), and K (Kex) expressed as a percentage of the cation exchange capacity (CEC) in the B horizons of the Hermine watershed for the period 1993 to 1997, inclusively. The mean values for a given sampling date are for the nine plots. The lines are displayed to underline the seasonal trends. Error bars are standard deviations.

View larger version (25K): [in a new window]   Fig. 6. Sulfate, Ca, Mg, H+, K, and Na fluxes, and H2O depth in the incident bulk precipitation collected at the Hermine watershed for the period 1982 to 2002, inclusively.