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Surface Peat Mass and Carbon Balance in a Hypermaritime Peatland

Wetlands Research Centre, Univ. of Waterloo, Waterloo, ON N2L 3G1, Canada

View larger version (29K): [in a new window]   Fig. 1. Location of the study site.

View larger version (27K): [in a new window]   Fig. 2. Aboveground net primary production (NPP) in relation to mean depth to groundwater table at the Diana Lake study site. Two constants and r2 values are for the linear regression y = ax + b. Note that the vertical scales are not consistent.

View larger version (34K): [in a new window]   Fig. 3. Carbon and N loss and gain of a standard litter (Sphagnum fuscum) incubated at the three depths at the Diana Lake study site.

View larger version (40K): [in a new window]   Fig. 4. Stratigraphy, humification, loss-on-ignition, and groundwater table (Mean ± SE) diagrams for the short cores at the Diana Lake study site. Symbols for stratigraphy represent the major components of the peat.

View larger version (17K): [in a new window]   Fig. 5. Peat age in relation to depth for the short cores at the Diana Lake study site. Ages were dated by 210Pb. Depth is expressed as cumulative (ash-free) dry mass (left-hand axis) and as length (right-hand axis). Ages are expressed as years before 2001. Means ± SD are shown.

View larger version (34K): [in a new window]   Fig. 6. Cumulative mass loss with depth for the short cores at the Diana Lake study site. Depth-dependent decomposition rates were estimated based on the results of 210Pb dating, organic mass, and net primary production (NPP). See text for details. Two constants and r2 values are for the regression curve y = a x [1 – exp(–b x x)]. Both the lower and higher NPP scenarios were used for the Sphagnum austinii hummock core and the Racomitrium lanuginosum–S. tenellum lawn core.

View larger version (14K): [in a new window]   Fig. 7. Change in mass of Sphagnum fuscum litter in litter bag after one and two years of decomposition at four sites in Canada. Litter bags were incubated in the original habitat of S. fuscum. The mass remaining at Year 0 means initial annual production of S. fuscum. British Columbia (54°13' N, 130°10' W), this study; Alberta (54°41' N, 113°28' W), Szumigalski and Bayley (1997) and Thormann and Bayley (1997b); Manitoba (49°53' N, 95°54' W), Reader and Stewart (1971)(1972); Ontario (49°40' N, 93°43' W): Rochefort et al. (1990). Highest value of the initial annual production in British Columbia includes the estimate of winter growth, and the lowest value shows the production from May to November. Initial annual NPP in Manitoba includes weight of capitula (Reader and Stewart, 1971).