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Effects of experimental clearcut logging on water quality in three small boreal forest lake trout ( Salvelinus namaycush ) lakes

2000; Canadian Science Publishing; Volume: 57; Issue: S2 Linguagem: Inglês

10.1139/cjfas-57-s2-92

1205-7533

Robert J. Steedman,

Fish Biology and Ecology Studies

Water quality was monitored in three 30-ha stratified headwater Precambrian Shield lakes for 5 years before and 3 years after moderate to extensive catchment deforestation. These lakes, which had water renewal times of about a decade, showed only minor changes in water quality by the third year after logging. Water quality response in a lake with moderate deforestation and intact shoreline forest was similar to that in two lakes with extensive upland and shoreline deforestation. By the second and third years after logging, May-September average volume-weighted concentrations of dissolved organic carbon, chlorophyll, total nitrogen, K+, Cl-, and Si had all increased, generally by about 10-40% over predisturbance levels, while Ca2+ and Mg2+ had declined by 10-25%. Dry weather the first year after logging was associated with temporary declines of 10-20% in dissolved organic carbon and chlorophyll.