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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
28/08/1994 |
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Data da última atualização: |
25/06/2025 |
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Autoria: |
CHANEY, W. R.; KELLY, J. M.; STRICKLAND, R. C. |
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Título: |
Influence of cadmium and zinc on carbon dioxide evolution from litter and soil from a black oak forest. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Journal of Environmental Quality, v. 7, p. 115-119, 1978. |
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Idioma: |
Inglês |
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Conteúdo: |
Studies have shown that heavy metals can reduce decomposition rates. Since litter decomposition is an essential part of forest mineral cycles, understanding the degree of impact that these substances have on such a key process is important. Two similar black oak forests, East Chicago (impacted) and Willow Slough (background), were chosen as study areas. Microcosms containing litter and mineral soil were collected at each site and returned to the laboratory where comparative measurements of carbon dioxide evolution were taken at 0, 12, 36, and 84 hours, and at 23 days. Measurements indicated a higher decomposition rate for the Willow Slough microcosms (138 mg CO2/hour per kg at 23 days) compared to the East Chicago microcosms (94 mg CO2/hour per kg). Additional microcosms from Willow Slough were treated with solutions containing all possible combinations of 0, 0.1, or 10 ppm CdCl2 and 0, 100, or 1,000 ppm ZnCl2. Metal concentrations applied were equivalent to litter and soil levels at East Chicago. Statistically significant differences were detected only 36 hours and 23 days after treatment. Reduced respiration rates were associated with high concentrations of CdCl2/ZnCl2. Suppression of respiration rates due to osmotic effects of metal salts was rejected after microcosms treated with KCl and CaCl2 exhibited no change in respiration. While high levels of cadmium and zinc produced reductions in respiration rates compared to controls, low level treatments may have stimulated decomposition slightly MenosStudies have shown that heavy metals can reduce decomposition rates. Since litter decomposition is an essential part of forest mineral cycles, understanding the degree of impact that these substances have on such a key process is important. Two similar black oak forests, East Chicago (impacted) and Willow Slough (background), were chosen as study areas. Microcosms containing litter and mineral soil were collected at each site and returned to the laboratory where comparative measurements of carbon dioxide evolution were taken at 0, 12, 36, and 84 hours, and at 23 days. Measurements indicated a higher decomposition rate for the Willow Slough microcosms (138 mg CO2/hour per kg at 23 days) compared to the East Chicago microcosms (94 mg CO2/hour per kg). Additional microcosms from Willow Slough were treated with solutions containing all possible combinations of 0, 0.1, or 10 ppm CdCl2 and 0, 100, or 1,000 ppm ZnCl2. Metal concentrations applied were equivalent to litter and soil levels at East Chicago. Statistically significant differences were detected only 36 hours and 23 days after treatment. Reduced respiration rates were associated with high concentrations of CdCl2/ZnCl2. Suppression of respiration rates due to osmotic effects of metal salts was rejected after microcosms treated with KCl and CaCl2 exhibited no change in respiration. While high levels of cadmium and zinc produced reductions in respiration rates compared to controls, low level treatments may have stimulated de... Mostrar Tudo |
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Palavras-Chave: |
Forest. |
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Thesagro: |
Decomposição; Floresta; Serapilheira. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02097naa a2200193 a 4500
001 1280048
005 2025-06-25
008 1978 bl uuuu u00u1 u #d
100 1 $aCHANEY, W. R.
245 $aInfluence of cadmium and zinc on carbon dioxide evolution from litter and soil from a black oak forest.$h[electronic resource]
260 $c1978
520 $aStudies have shown that heavy metals can reduce decomposition rates. Since litter decomposition is an essential part of forest mineral cycles, understanding the degree of impact that these substances have on such a key process is important. Two similar black oak forests, East Chicago (impacted) and Willow Slough (background), were chosen as study areas. Microcosms containing litter and mineral soil were collected at each site and returned to the laboratory where comparative measurements of carbon dioxide evolution were taken at 0, 12, 36, and 84 hours, and at 23 days. Measurements indicated a higher decomposition rate for the Willow Slough microcosms (138 mg CO2/hour per kg at 23 days) compared to the East Chicago microcosms (94 mg CO2/hour per kg). Additional microcosms from Willow Slough were treated with solutions containing all possible combinations of 0, 0.1, or 10 ppm CdCl2 and 0, 100, or 1,000 ppm ZnCl2. Metal concentrations applied were equivalent to litter and soil levels at East Chicago. Statistically significant differences were detected only 36 hours and 23 days after treatment. Reduced respiration rates were associated with high concentrations of CdCl2/ZnCl2. Suppression of respiration rates due to osmotic effects of metal salts was rejected after microcosms treated with KCl and CaCl2 exhibited no change in respiration. While high levels of cadmium and zinc produced reductions in respiration rates compared to controls, low level treatments may have stimulated decomposition slightly
650 $aDecomposição
650 $aFloresta
650 $aSerapilheira
653 $aForest
700 1 $aKELLY, J. M.
700 1 $aSTRICKLAND, R. C.
773 $tJournal of Environmental Quality$gv. 7, p. 115-119, 1978.
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