The Environmental Capacity Approach to the Control of Marine Pollution: The Case of Copper in the Krka River Estuary |
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| Authors: | V Pravdi? M Jura?i? |
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| Institution: | 1. Department of Environmental Sciences, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto 390-8621, Japan;2. Department of Biological Environment, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi, Shimoshinjo-Nakano, Akita 010-0195, Japan;3. Nagano Vegetable and Ornamental Crops Experiment Station, 1066-1 Tokoo, Soga, Shiojiri 399-6461, Japan;4. Institute of Mountain Science, Shinshu University, 3-1-1 Asahi, Matsumoto 390-8621, Japan;5. Soil Science and Plant Nutrition Division, NARO Agricultural Research Center, 3-1-1 Kannondai, Tsukuba 305-8666, Japan |
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| Abstract: | Changes in soil pH, soil heavy metal forms, and the metabolic diversity of microbial communities were examined in soil samples collected in 1-mm increments from barley roots in soil contaminated with cadmium (Cd) and zinc (Zn) using a rhizobox system. Concentrations of exchangeable Cd and Zn increased near the roots owing to a decrease in soil pH. Conversely, the concentration of inorganically bound Cd and Zn decreased near the roots. Despite having the highest concentration of the most toxic exchangeable metals, the rhizosphere also had the highest bacterial and fungal metabolic activity and diversity when assessed using BIOLOG plates. Therefore, the promoting effects of root exudates on microbial activity could outweigh the adverse effects of Cd and Zn on microorganisms in the rhizosphere. |
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| Keywords: | Contaminant load Mariculture Hydrology |
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