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71.
Victoria Burke Doreen Richter Ulrike Hass Uwe Duennbier Janek Greskowiak Gudrun Massmann 《Environmental Earth Sciences》2014,71(8):3685-3695
The biodegradation of various wastewater-derived organic trace pollutants occurring in different aquatic compartments of the environment was previously reported to be influenced by the prevailing redox conditions. However, comparative studies on the redox-dependent degradation behavior of organic trace pollutants are scarce. The objective of the study presented herein, was to compile and evaluate data from several comparable previous tank experiments, thus, providing an overview on the redox-dependent removal of a total of 27 wastewater-derived trace compounds, including phenazone type compounds, antimicrobials, ß-blockers, psychoactive drugs and sulfonamides. Removal rate constants were fitted assuming first-order degradation kinetics. Six compounds were identified to be removed solely under oxic, three compounds solely under anoxic conditions. Others persisted under all experimental conditions, while some were removed under both oxic and anoxic conditions. 相似文献
72.
Response of aquatic plants to abiotic factors: a review 总被引:7,自引:0,他引:7
This review aims to determine how environmental characteristics of aquatic habitats rule species occurrence, life-history
traits and community dynamics among aquatic plants, and if these particular adaptations and responses fit in with general
predictions relating to abiotic factors and plant communities. The way key abiotic factors in aquatic habitats affect (1)
plant life (recruitment, growth, and reproduction) and dispersal, and (2) the dynamics of plant communities is discussed.
Many factors related to plant nutrition are rather similar in both aquatic and terrestrial habitats (e.g. light, temperature,
substrate nutrient content, CO2 availability) or differ markedly in intensity (e.g. light), variations (e.g. temperature) or in their effective importance
for plant growth (e.g. nutrient content in substrate and water). Water movements (water-table fluctuations or flow velocity)
have particularly drastic consequences on plants because of the density of water leading to strong mechanical strains on plant
tissues, and because dewatering leads to catastrophic habitat modifications for aquatic plants devoid of cuticle and support
tissues. Several abiotic factors that affect aquatic plants, such as substrate anoxia, inorganic carbon availability or temperature,
may be modified by global change. This in turn may amplify competitive processes, and lead ultimately to the dominance of
phytoplankton and floating species. Conserving the diversity of aquatic plants will rely on their ability to adapt to new
ecological conditions or escape through migration. 相似文献