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Effects of liming on soil respiration, fungi diversity and abundance in a metal-contaminated region in Northern Ontario
No full textAt present, little is known concerning the fungi communities inhabiting the Greater Sudbury Region. This study aimed at identifying the fungal species and abundance in limed and unlimed areas contaminated with metals. Samples were collected from the LFH soil layer from Wahnapitae Hydro-Dam, Daisy Lake, Kingsway, Kelly Lake, Hagar, Onaping Falls and Capreol. Limed and unlimed areas were compared for soil metals, pH, fungi diversity, abundance and seasonal soil respiration. Fungi from soil samples were cultured using Sabouraud Dextrose Agar and Malt Extract Agar. A total of 52 fungi species from 34 genera were identified. There was a significantly higher fungal diversity in the limed areas compared to the samples from unlimed sites based on SDA medium data. Fungi abundance followed the same trend. Significantly higher soil respiration rates were recorded for limed sites compared to unlimed sites. Summer soil respiration rates correlated (r = 0.50) with total fungal abundance
Fate of limestone dissolution products in acidic metalcontaminated soil mesocosms
Get PDFThe impact of liming (10 t ha-1 of calcitic and dolomitic limestone, separately) on the soil
solution and soil matrix was investigated in an acidic metal-contaminated soil from Sudbury,
ON. A soil mesocosm experiment was performed; columns were leached with simulated
rainwater and the soil solution collected at various locations throughout the soil column. The
dissolution rate of calcitic limestone used for this experiment was found to be approximately
double that of the dolomitic limestone investigated. Calcium and Mg released during limestone
dissolution migrated through the soil profile to the Bf-BC interface. The addition of limestone
increased the pH and decreases the bioavailability of Ni, Cu, Co, Cd, As, Ba, Mn, and Zn the
LFH horizon. Amending acid, contaminated soils with calcitic or dolomitic limestone has
profound effects on soil solution chemistry