INFLUENCE OF CADMIUM ON DECOMPOSITION OF SEWAGE SLUDGE AND MICROBIAL ACTIVITIES IN SOILS
スポンサーリンク
概要
- 論文の詳細を見る
Investigations were conducted to evaluate the influence of cadmium (Cd) on the decomposition of sewage sludge, microflora and enzyme activities in soils. Cadmium and sewage sludge were mixed with 5 different types of soil at levels of 0-30 μmol/g and 20 mg/g, respectively. During 8 weeks of soil incubation at 28℃, the mineralization of C was periodically measured. At the end of the incubation period, the soils were also analyzed to determine the amount of N mineralized, the numbers of bacteria, actinomycetes and fungi, the activities of β-glucosidase and proteinase, and the amount of Cd extracted with water, CH_3COONH_4, Na_4P_2O_7, and HCl. The amount of CO_2 evolved which decreased markedly with the addition of higher amounts of Cd, varied with the soils used. When the soil Cd concentration was based on the water-soluble form, the critical level for CO_2 evolution appeared to be identical, about 1 μg/g, for all soils. When the concentration was more than 1 μg/g, the amount of CO_2 evolved decreased in proportion to the log concentration of water-soluble Cd irrespective of soil type. Similar trends were observed for N mineralization, and numbers of bacteria and actinomycetes. In contrast, the number of fungi and the -glucosidase activity tended to increase with the level of Cd. Proteinase was less active when the concentration of Cd increased. Since the concentration of water-soluble Cd in agricultural land of Japan is less than 1 g/g soil, the influence of Cd in the soils on soil microorganisms and their activities is limited.
- 一般社団法人日本土壌肥料学会の論文
- 1989-06-00
著者
関連論文
- DECOMPOSITION OF SEWAGE SLUDGES IN SOIL AS AFFECTED BY THEIR ORGANIC MATTER COMPOSITION
- Influence of Cadmium on Decomposition of Glucose and Cellulose in Soil
- MICROBIAL ACTIVITIES IN SOIL AMENDED WITH SEWAGE SLUDGES
- INFLUENCE OF CADMIUM ON DECOMPOSITION OF SEWAGE SLUDGE AND MICROBIAL ACTIVITIES IN SOILS