Landscape controls on phosphorus loading to boreal lakes: implications for the potential impacts of forest harvesting
| Autor: | K J Devito, I F Creed, R L Rothwell, E E Prepas |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences. 57:1977-1984 |
| ISSN: | 1205-7533 0706-652X |
| DOI: | 10.1139/f00-148 |
| Popis: | For 12 low-order lakes in the Western Boreal Forest of Canada, lake position in the groundwater flow system and surface hydrologic connection to wetlands accounted for 57% of the variation in the change in postharvest (1997) relative to preharvest (1996) open-water median total phosphorous concentration ([TP]). Changes in [TP] decreased with calcium and magnesium concentrations, indicating that the largest increases in [TP] are likely to occur in lakes located in areas of groundwater recharge or shallow local discharge. Changes in [TP] increased with the area of wetland connected to the lake, a measure of near-surface hydrologic flushing of TP to the lake. However, the remaining variation (43%) in the TP response of lakes to harvest was not explained by landscape-based criteria. This study illustrates that in landscapes with complex hydrogeology, factors controlling the chemical responses of lakes to disturbance are complex, remain poorly understood, and require further study. |
| Databáze: | OpenAIRE |
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