Modelling the Impact of Climate Change on Phytoplankton Dynamics and the Oxygen Budget of the Elbe River and Estuary (Germany)

Mini-Symposium: Impacts of Climate Chang

Die Reaktivierung von Schienenstrecken als Strategie der integrierten Raumentwicklung: Chancen nutzen und Hemmnisse überwinden

Der Ausbau von Schienennetzen für den Personen- und Güterverkehr durch die Reaktivierung stillgelegter Strecken ist ein Gebot der Stunde! Schienenstrecken ermöglichen nachhaltige Mobilität, gesellschaftliche Teilhabe und die Schaffung gleichwertiger Lebensverhältnisse. Hierzu bedarf es einer grundsätzlich neuen und integrierten Ausrichtung der Raum- und Verkehrsplanung. Neben der dringend gebotenen Trassensicherung durch die Raumordnung müssen stillgelegte Schienenstrecken bezüglich ihrer Potenziale für die Orts- und Regionalentwicklung erkannt und reaktiviert werden. Stationen an Schienenstrecken können insbesondere in ländlichen Räumen wesentliche Entwicklungsimpulse erzeugen und als Mobilitätsdrehscheiben fungieren. Dabei gilt es, bisherige Hindernisse zu überwinden, indem beispielsweise neue volkswirtschaftliche Bewertungsmaßstäbe angesetzt und neue Finanzierungsmodelle eingeführt werden.The expansion of rail networks for passenger and cargo services by reactivating disused rail lines is an urgent need of the hour! Rail lines enable sustainable mobility, social participation and the creation of equal living conditions. This requires a fundamentally new and integrated approach to spatial and transport planning. In addition to the urgent need to secure routes by means of spatial planning, disused railway lines must be recognized with regard to their potential for local and regional development and be reactivated. Stations on railway lines can generate significant development impulses, particularly in rural areas, and act as mobility hubs. Previous obstacles must be overcome, for example by applying new economic evaluation standards and introducing new financing models

Phytoplankton gross primary production increases along cascading impoundments in a temperate, low-discharge river : Insights from high frequency water quality monitoring

Damming alters carbon processing along river continua. Estimating carbon transport along rivers intersected by multiple dams requires an understanding of the effects of cascading impoundments on the riverine metabolism. We analyzed patterns of riverine metabolism and phytoplankton biomass (chlorophyll a; Chla) along a 74.4-km river reach intersected by six low-head navigation dams. Calculating gross primary production (GPP) from continuous measurements of dissolved oxygen concentration, we found a maximum increase in the mean GPP by a factor of 3.5 (absolute difference of 0.45 g C m−3 d−1) along the first 26.5 km of the study reach, while Chla increased over the entire reach by a factor of 2.9 (8.7 µg l−1). In the intermittently stratified section of the deepest impoundment the mean GPP between the 1 and 4 m water layer differed by a factor of 1.4 (0.31 g C m−3 d−1). Due to the strong increase in GPP, the river featured a wide range of conditions characteristic of low- to medium-production rivers. We suggest that cascading impoundments have the potential to stimulate riverine GPP, and conclude that phytoplankton CO2 uptake is an important carbon flux in the river Saar, where a considerable amount of organic matter is of autochthonous origin