Lake-landscape connections at the forest-tundra transition of northern Manitoba

摘要: To better understand aquatic–terrestrial linkages in the sub-Arctic, and specifically relative importance of landscape position versus land cover, we surveyed lakes, soils, lake/basin characteristics a 14 000 km 2 region acidic forest–tundra near northern Manitoba, Canada (59.56°N, 97.72°W) 2009. We analyzed 39 different biological, chemical, physical variables for lakes soils. used remote-sensing– based classification to determine that was 21% water, 46% peat-forming lowland, 24.9% open tundra, assigned lake order all on outlet stream each lake. Lakes were oligotrophic mesotrophic (median total phosphorus: TP = 11.8 µg L −1 ), N-limited dissolved inorganic nitrogen: 1.6), pH 5.7), had moderate amounts organic carbon DOC 5.2 mg ). identified principle groups represented by conductivity/ cations, respectively, captured major axes variation. DOC, measures quality (a 250 /a 365 [a proxy molecular weight aromaticity] specific ultraviolet absorbance), Fe significantly correlated with percent cover lowland forest, but conductivity/cations not variation cover. Soils generally (pH 2.7–4.4) nutrient-poor, wetland soils contained more higher concentrations calcium, magnesium, other cations than upland tundra. Landscape (measured as order) did capture systematic differences or biogeochemistry. Our results highlight export further suggest need additional regional studies connections Arctic sub-Arctic landscapes.