Effects of arsenic on nutrient dynamics of grassland microcosms and field plots
| Autor: | Maxine J. Levin, Beverly S. Ausmus, Danny R. Jackson |
|---|---|
| Rok vydání: | 1979 |
| Předmět: |
geography
Environmental Engineering geography.geographical_feature_category Ecological Modeling food and beverages chemistry.chemical_element Pollution Grassland Field plot Nutrient Agronomy chemistry Dissolved organic carbon Environmental Chemistry Environmental science Terrestrial ecosystem Leachate Microcosm Arsenic Water Science and Technology |
| Zdroj: | Water, Air, and Soil Pollution. 11:13-21 |
| ISSN: | 1573-2932 0049-6979 |
| DOI: | 10.1007/bf00163515 |
| Popis: | Grassland field plots were compared to two sizes of excised microcosms (15 and 30 cm diameter) and 30-cm diameter homogenized microcosms to assess the effects of As on soil-plant nutrient dynamics. The goal of this experiment was to determine the feasibility of using microcosms for screening chemicals which are potentially toxic to terrestrial ecosystems. All experimental units were treated with As, at rates of 0, 0.5, and 5.0 mg cm−2, by superficial application of dissolved Na2AsO4. Calcium, PO4-P, NO3-N, dissolved organic carbon (DOC), and NH4-N were determined in soil leachate and soil extracts. Greater loss of PO4-P, NO3-N, NH4-N, and DOC occurred via soil leachate from microcosms treated with the greatest level of As relative to untreated microcosms. Field plots were unaffected by As treatment. Excised microcosms were found to be more representative of field plots in reflecting microbial dynamics than were homogenized microcosms. Thus excised microcosms were recommended for testing potentially hazardous chemicals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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