Differences in temperature, organic carbon and oxygen consumption among lowland streams

摘要: Summary 1. Temperature, organic carbon and oxygen consumption were measured over a year at 13 sites in four lowlands streams within the same region North Zealand, Denmark with objectives of determining: (i) spatial seasonal differences between open streams, forest or without lakes, (ii) factors influencing temperature dependence rate, (iii) consequences higher content lake outlets on (iv) possible forecasted global warming degradation matter. 2. High concentrations easily degradable dissolved (DOC) particulate (POC) found downstream plankton-rich while high recalcitrant DOC brook draining swamp. Concentrations predominantly POC low groundwater-fed spring. Overall, concentration was two to 18 times than concentrations. 3. Oxygen rate 20 °C during summer winter, shaded inlets. Rate closely related chlorophyll but not DOC. The ratio total (DOC + POC), serving as measure degradability, highest intermediate lowest streams. 4. Temperature coefficients describing exponential increase 4 averaged 0.121 °C−1 (Q10 3.35) 70 measurements showed no significant variations seasons stream correlations ambient content. 5. enhanced lakes because and, more significantly, greater carbon. rates up seven three impoundments neighbouring unshaded 21 spring. 6. A regional climate model has calculated dramatic 4–5 °C rise air by 2070–2100. If this is realised, are estimated become 2–3 °C warmer winter 5–7 °C spring thereby, 30–40% 80–130%, respectively. Faster matter point sources should likelihood stress biota lead export less mineralised nutrients coastal waters.