บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Landscape controls on phosphorus loading to Boreal lakes: implications for the potential impacts of forest harvesting.

Devito, K. J.; Creed, I. F.; Rothwell, R. L.; Prepas, E. E.;

Canadian Journal of Fisheries and Aquatic Sciences Year: 2000 Vol: 57 Issue: 10 Pages: 1977-1984 Ref: 38 ref.

2000

บทคัดย่อ

Landscape controls on phosphorus loading to Boreal lakes: implications for the potential impacts of forest harvesting.

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. Charges in [TP] increased with the are 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 landscape with complex hydrogeology, factors controlling the chemical responses for lakes to disturbance are complex, remain poorly understood, and require further study.