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Roots versus shoots in nutrient uptake by aquatic macrophytes in flowing waters

Roots versus shoots in nutrient uptake by aquatic macrophytes in flowing waters

Canadian Journal of Fisheries & Aquatic Sciences 46(3): 435-439

Transplant experiments conducted in the South Saskatchewan River, Saskatchewan, Canada showed that the aquatic macrophyte, Potamogeton crispus, obtained most of its nutrients through the roots. When plants were grown in buckets containing high (602 .MU.g .cntdot. g-1 total phosphorus, 712 .mu.g .cntdot. g-1 total organic nitrogen) or low (258 .mu.g .cntdot. g-1 total phosphorus; 109 .mu.g .cntdot. g-1 total organic nitrogen) nutriet sediments and exposed to high (75 .MU.g .cntdot. L-1 soluble reactive phosphorus (SRP); 530 .mu.g .cntdot. L-1 total dissolved nitrogen (TDN), or low (10 .mu.g .cntdot. L-1 SRP; 323 .mu.g < L-1 TDN) nutrient concentrations in the open water, biomass, shoot density and tissue nutrient concentrations were largely determined by sediment type, rather than open water chemistry. These results indicate that the roots are an important site of nutrient uptake for aquatic macrophytes in flowing waters.

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Accession: 002213738

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DOI: 10.1139/f89-058

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