RESUMEN
Water eco-functional regionalization is a new zoning approach based on the study of regional differences in water ecosystem, aimed to reveal the spatial differentiation characteristics and distribution patterns of water environment at different regional and zonal scales. This paper discussed the methodologies, objectives, and limitations of water function zoning, water environmental function zoning, geoecology zoning, ecoregion classification, and water eco-functional regionalization, summarized the research progress in the water eco-functional regionalization, and compared the regionalization system at home and abroad. The disadvantages of our water eco-functional regionalization system were pointed out, and its development trend was prospected.
Asunto(s)
Conservación de los Recursos Naturales , Ecosistema , Monitoreo del Ambiente , Agua Dulce/análisis , Contaminación del Agua/prevención & control , China , EcologíaRESUMEN
The growth characteristics and the decontamination of heavy metals in analogous heavy metals wastewater by transgenic Synechococcus sp. PCC 7002 with mouse metallothionein-I gene were studied. The results show that transgenic Synechococcus sp. PCC 7002 not only has a higher tolerance to heavy metals, but also has a higher growth rate than wild strain. The concentration of Cd2+, Pb2+ and Hg2+ decreases with the progress of cultivation, and its maximum decreasing extent occurs at 1 - 3 day. After three days of cultivation, the absorption of Cd2+, Pb2+ and Hg2+ by transgenic Synechococcus sp. PCC 7002 is 10.75, 58.89 and 112.61 mg g(-1) of dried cells respectively, which is 3.16, 2.18 and 100.45 times higher than wild cells. The mono-factor and overall model developed fit the experiment data well.