To investigate the effects of Tianshifu soil conditioners on rice growth and their control effects on Cd absorption and accumulation in rice, a test was carded out in the field typically polluted by Cd in Hunan Provin...To investigate the effects of Tianshifu soil conditioners on rice growth and their control effects on Cd absorption and accumulation in rice, a test was carded out in the field typically polluted by Cd in Hunan Province. The results showed that the Tianshifu soil conditioner, soil bacterial conditioner and the combination of Tian- shifu soil conditioner and soil bacterial conditioner all could promote rice growth, im- prove rice yield and reduce significantly Cd content in rice grains. In Beishan, the Cd contents in rice grains treated by Tianshifu soil conditioner, soil bacterial condi- tioner and the combination of Tianshifu soil conditioner and soil bacterial conditioner were reduced by 37.63% （P〈0.05）, 32.59% （P〈0.05） and 27.95% （P〈0.05） respec- tively compared with that in rice grains treated by conventional fertilization; In Xiang- tan, the Cd contents in rice grains were reduced by 54.36% （P〈0.05）, 50.19% （P〈 0.05） and 45.22% （P〈0.05） respectively. The rice grains harvested at the two test sites all met the national food safety standards. Considering the control effect on Cd contamination, Tianshifu soil conditioner 〉 combination of Tianshifu soil condi- tioner and soil bacterial conditioner 〉 Tianshifu soil bacterial conditioner. In addition to reducing Cd absorption in rice, as described in the lime application treatment, the application of Tianshifu soil conditioners also inhibited the transportation of Cd from rice straws to rice grains. The Tianshifu soil conditioner, soil bacterial conditioner and combination of Tianshifu soil conditioner and soil bacterial conditioner also effec- tively improved the soil acidity, increased the soil pH value and reduced soil avail- able Cd content to some extent.展开更多
This article deals with the important experience of regional planning developed by the CESP （Companhia Energ6tica de Silo Paulo）, Brazil, through the implantation of its hydroelectric projects. The company accumulat...This article deals with the important experience of regional planning developed by the CESP （Companhia Energ6tica de Silo Paulo）, Brazil, through the implantation of its hydroelectric projects. The company accumulated a large experience in deploying and managing residential centers built to provide support to the works of their dams. The presence of urban planning was verified in all cases studied, with the participation of different professionals such as architects, planners, engineers and landscape designers, from inside or outside the company. This research shows that they used concepts derived from experiences as company towns of 19th century, the neighborhood unit, the garden city, the urbanistic assumptions from CIAM （Congr^s Internationaux d＇Architecture Moderne） and the TVA （Tennessee Valley Authority）.展开更多
文摘To investigate the effects of Tianshifu soil conditioners on rice growth and their control effects on Cd absorption and accumulation in rice, a test was carded out in the field typically polluted by Cd in Hunan Province. The results showed that the Tianshifu soil conditioner, soil bacterial conditioner and the combination of Tian- shifu soil conditioner and soil bacterial conditioner all could promote rice growth, im- prove rice yield and reduce significantly Cd content in rice grains. In Beishan, the Cd contents in rice grains treated by Tianshifu soil conditioner, soil bacterial condi- tioner and the combination of Tianshifu soil conditioner and soil bacterial conditioner were reduced by 37.63% （P〈0.05）, 32.59% （P〈0.05） and 27.95% （P〈0.05） respec- tively compared with that in rice grains treated by conventional fertilization; In Xiang- tan, the Cd contents in rice grains were reduced by 54.36% （P〈0.05）, 50.19% （P〈 0.05） and 45.22% （P〈0.05） respectively. The rice grains harvested at the two test sites all met the national food safety standards. Considering the control effect on Cd contamination, Tianshifu soil conditioner 〉 combination of Tianshifu soil condi- tioner and soil bacterial conditioner 〉 Tianshifu soil bacterial conditioner. In addition to reducing Cd absorption in rice, as described in the lime application treatment, the application of Tianshifu soil conditioners also inhibited the transportation of Cd from rice straws to rice grains. The Tianshifu soil conditioner, soil bacterial conditioner and combination of Tianshifu soil conditioner and soil bacterial conditioner also effec- tively improved the soil acidity, increased the soil pH value and reduced soil avail- able Cd content to some extent.
文摘This article deals with the important experience of regional planning developed by the CESP （Companhia Energ6tica de Silo Paulo）, Brazil, through the implantation of its hydroelectric projects. The company accumulated a large experience in deploying and managing residential centers built to provide support to the works of their dams. The presence of urban planning was verified in all cases studied, with the participation of different professionals such as architects, planners, engineers and landscape designers, from inside or outside the company. This research shows that they used concepts derived from experiences as company towns of 19th century, the neighborhood unit, the garden city, the urbanistic assumptions from CIAM （Congr^s Internationaux d＇Architecture Moderne） and the TVA （Tennessee Valley Authority）.
