Integrated monitoring and modeling to disentangle the complex spatio-temporal dynamics of urbanized streams under drought stress.

We have a poor understanding of how urban drainage and other engineered components interact with more natural hydrological processes in green and blue spaces to generate stream flow. This limits the scientific evidence base for predicting and mitigating the effects of future development of the built environment and climate change on urban water resources and their ecosystem services. Here, we synthesize > 20 years of environmental monitoring data to better understand the hydrological function of the 109-km Wuhle catchment, an important tributary of the river Spree in Berlin, Germany.

Distribution pattern of dissolved organic matter in pore water of sediments from three typical areas of western Lake Taihu and its environmental implications.

The migration, transformation, and accumulation of dissolved organic matter (DOM) in pore water of sediment cores play a pivotal role in lacustrine carbon cycling. In order to understand the dynamics of DOM in the sediments of large shallow eutrophic lakes, we examined the vertical profiles of DOM and the benthic fluxes of dissolved organic carbon (DOC) in sediment cores located in algae accumulated, dredged, and central areas of eutrophic Lake Taihu, China. Optical properties showed the significant influence of terrestrial inputs on the DOM components of pore water in the algae accumulated area but an abundant accumulation of autochthonous DOM in the central area.

Tracer-aided identification of hydrological and biogeochemical controls on in-stream water quality in a riparian wetland.

In-stream water quality reflects the integrated results of hydrological mixing of different water sources and associated biogeochemical transformations. However, quantifying the relative importance of these controls is often challenging, particularly in riparian wetlands due to complex process interactions and marked spatio-temporal heterogeneity in environmental gradients. Here, we established a two-step method to differentiate the dominance of hydrological and biogeochemical controls on water quality in a riparian peatland in northern Germany.

Reservoirs change pCO and water quality of downstream rivers: Evidence from three reservoirs in the Seine Basin.

The global increase in the construction of reservoirs has drawn attention given its documented hydrological and biogeochemical impacts on downstream rivers; however, the impact of reservoirs on downstream pCO (partial pressure of carbon dioxide) is still poorly understood. To evaluate these impacts, the interactions between reservoirs and their corresponding upstream and downstream rivers were analyzed for three reservoirs in the Seine Basin based on monthly measurement during two hydrological years. The seasonal variations of water quality in the reservoirs were mainly driven by the entering water and the biogeochemical processes occurring in the reservoirs.

Seasonal iron‑sulfur interactions and the stimulated phosphorus mobilization in freshwater lake sediments.

Sulfur reduction in freshwater ecosystems has previously been considered as negligible because of often very low sulfate concentrations and generally low sulfate reducing capacity in freshwater sediments. In this study, seasonal variations on three types of sediments from central lake, dredged and algae accumulated areas in a eutrophic lake in China, Lake Taihu, were investigated. The high temperature in summer and the accumulation of algae are conducive to the reduction processes in freshwater lake sediments.

Parallelism of Nutrients and CO Dynamics: Evidence Based on Long-Term Data in Taihu Lake.

Inland lakes are important ecosystems for the carbon cycle at both regional and global scales. However, a knowledge gap still exists about the correlations between the partial pressure of CO (pCO) and nutrient dynamics in lakes. In this study, we analysed the long-term dynamics of nutrient and pCO in Taihu Lake.

Sulfur cycling in freshwater sediments: A cryptic driving force of iron deposition and phosphorus mobilization.

Sulfur cycling in freshwater ecosystems has been previously considered minor, and the direct evidence of its impacts on iron and phosphorus cycles in freshwater sediments remains unclear. In this study, mesocosms with amended acetate and various sulfate concentrations (1.5-3.

Cyanobacteria blooms: A neglected facilitator of CH production in eutrophic lakes.

Lakes are regarded as one of the important sources of atmospheric CH. However, the role of cyanobacteria blooms (CBBs) play in the CH production in eutrophic lakes is not fully clear. In this study, the spatial distribution characteristics of CH concentrations in surface water and sediment columns were investigated in Zhushan Bay of Taihu lake, China.

Climate warming and cyanobacteria blooms: Looks at their relationships from a new perspective.

Climate warming and eutrophication are regarded as two important contributors to the occurrence of cyanobacteria blooms in aquatic ecosystems. However, the feedback of cyanobacteria blooms to climate warming and eutrophication is not fully clear. In this study, a microcosm system was established to simulate the decomposition processes of cyanobacteria blooms.

[Deposition Characteristics of Suspended Solids and the Response of Dissolved Nutrients in Spring in the Western Lakeside of Taihu Lake].

To reveal the spatiotemporal characteristics of nutrients in the deposition process of suspended solids in lakeside zone, deposition tests were performed in the western lakeside of Taihu Lake,and the contents of TP,TN,NH-N and NO-N were measured and analyzed.The results showed that the deposition fluxes in the western lakeside of Taihu Lake ranked as follows:artificial reed areas >non-vegetation nearshore areas >natural reed areas >non-vegetation offshore areas,with their average values of (1383.40±925.