Reservoirs as sentinels of catchments: the Rappbode Reservoir Observatory (Harz Mountains, Germany)   总被引：2，自引：2，他引：0  

Karsten Rinke  Burkhard Kuehn  Serghei Bocaniov  Katrin Wendt-Potthoff  Olaf Büttner  Jörg Tittel  Martin Schultze  Peter Herzsprung  Helmut Rönicke  Karsten Rink  Kristine Rinke  Maren Dietze  Marco Matthes  Lothar Paul  Kurt Friese 《Environmental Earth Sciences》2013,69(2):523-536

Reservoirs can be viewed as sentinels of their catchments and a detailed monitoring of reservoir systems informs about biogeochemical and hydrological processes at the catchment scale. We developed a comprehensive online monitoring system at Rappbode reservoir, the largest drinking water reservoir in Germany, and its inflows. The Rappbode Reservoir Observatory comprises of a set of online-sensors for the measurement of physical, chemical, and biological variables and is complemented by a biweekly limnological sampling schedule. Measurement stations are deployed at the four major inflows into the system, at the outlets of all pre-reservoirs, as well as in the main reservoir. The newly installed monitoring system serves both scientific monitoring and process studies, as well as reservoir management. Particular emphasis is paid to the monitoring of short-term dynamics and many variables are measured at high temporal resolution. As an example, we quantitatively documented a flood event which mobilised high loads of dissolved organic carbon and changed the characteristics of the receiving reservoir from eutrophic to dystrophic within a few days. This event could have been completely missed by conventional biweekly sampling programs, but is relevant for biogeochemical fluxes at the catchment scale. We also show that the high frequency data provide a deeper insight into ecosystem dynamics and lake metabolism. The Rappbode Reservoir Observatory; moreover, offers a unique study site to apply, validate, and develop state of the art lake models to improve their predictive capabilities.  相似文献   

Impact of tributary DOM and nutrient inputs on the nearshore ecology of a large, oligotrophic lake (Georgian Bay, Lake Huron, Canada)   总被引：1，自引：0，他引：1  

Serghei A. Bocaniov  David R. Barton  Sherry L. Schiff  Ralph E. H. Smith 《Aquatic Sciences - Research Across Boundaries》2013,75(2):321-332

Two adjacent bays in a large oligotrophic lake (Georgian Bay, Lake Huron) were compared to determine how the inputs from relatively pristine, but moderately humic, tributaries may influence phytoplankton, nutrients and system metabolism. Dissolved organic carbon (DOC) concentrations decreased from 4 to 5 gC m^?3 at inner sites to 2 gC m^?3 or less at outer sites. The concentration gradient from inner to outer was greater in the bay with a major tributary, and optical properties (intensity and slope of light absorption spectrum) showed there was a loss of material with allochthonous characteristics along the gradient. Chlorophyll a (Chl a) and total phosphorus (TP) were also higher at inner (2–4 mg Chl a m^?3 and 8–12 mgP m^?3, respectively) than outer sites (≤1 mg Chl a m^?3 and 4–5 mgP m^?3). Chl a and TP, as well as particulate nutrient ratios (C:P, C:N, N:P), indicated significant eutrophication at inner sites, especially in the bay with the tributary, and there was a strong positive Chl a-phosphorus relationship. The stable oxygen isotope ratio (¹⁸O:¹⁶O) of dissolved oxygen indicated greater influence of biological oxygen fluxes at inner sites (where ratios were 2–3 ppt below atmospheric equilibrium) than at outer sites (where ratios were within 0.5 ppt of equilibrium). Community photosynthesis:respiration ratios inferred from ¹⁸O:¹⁶O varied positively with Chl a and inorganic nutrients, but negatively with DOC. Altered loading of allochthonous organic matter can be expected under changing climate and development scenarios and will have significant influence on optical properties and system metabolism through changes in DOC in this coastal system. The effects will nonetheless be strongly modulated by any accompanying change in inorganic nutrients.  相似文献