Chinese domestic satellite HJ-1 was launched in 2008, now it has become a significant resource for environment monitoring because its Multispectral data are characterized by 2-day temporal resolution, 30 m spatial resolution and 700 km breadth. A study case was made that HJ-1 multispectral data were used for retrieving aggregative trophic level index (TLI()) of water body of lakes in Wuhan, China. The aim of this study is to evaluate the probability of HJ-1 Multispectral data on estimating the eutrophic level of inland water. At first, the TLI() of sampling spots of some lakes in Wuhan were calculated using the monitoring water quality data. In the mean time, the NDVI of corresponding spots were calculated from the HJ-1 multispectral data which had been taken radiometric calibration and geometric correction beforehand. After that, a remote sensing inversion model for TLI() had been built through linear regression using the NDVI as independent variables. Finally, the TLI() of all water bodies of Wuhan lakes were inversed with this model and a map for its spatial distribution was drawn up. Results demonstrated that there were good linear correlation relationships between the TLI() and NDVI of HJ-1 Multispectral data, and the distribution of inversed TLI() of the lakes accorded with the reality quite well. According to the above, an inference can be made that the methods to evaluate lakes eutrofication based on the HJ-1 satellite multispectral data may provide a cheap and rapid way for real-time monitoring and evaluation of lakes eutrophication.

This paper states the economic reasons of environmental pollution at first, and then introduces the theory, methods and practical measures of pollution control. Finally it puts forward the discussion on controlling the environmental pollution through axiology.

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The primary hepatocytes of Carassius auratus were incubated with 0, 0.01, 0.1, 1, 10 and 100 mg/l Cadmium(Cd2+) at 25°C for 8h in vitro. The results showed that the hepatocytes survival rate in the 1, 10 and 100 mg/l Cd2+ treated groups were significantly lower than that in the control, the percentage of apoptotic hepatocytes significantly increased in 0.1, 1 and 10 mg/l of Cd2+ treated groups, intracellular reactive oxygen species(ROS) and malondialdehyde (MDA) content significantly increased in 0.1, 1, 10 and 100 mg/l Cd2+ treated groups, typical DNA ladder was observed in 0.1, 1 and 10 mg/l Cd2+ treated groups, and ruleless DNA fragment occurred in 100 mg/l Cd2+ treated group. The activities of the antioxidant enzymes and the expression of their isozymes activities have similar change tendency, compared with the control group, the activities of superoxide dismutase (SOD) and their isozymes were activated by low concentration of Cd2+ (0.1 and 1 mg/l), however, their activities were inhibited by high concentration of Cd2+ (10 and 100 mg/l), especially, the special isozyme (SOD1) was found in the patterns of SOD isozymes in 0.1 and 1 mg/l Cd2+ treated groups, the activities of peroxidase(POD) and its isozymes significantly reduced with a concentration-dependent manner in all Cd Cd2+ treated groups, the activities of catalase(CAT) and its isozymes significantly decreased in higher concentration Cd2+ treated groups (1, 10 and 100mg/l). The results suggested that Cd2+ could damage the activities of the antioxidant enzymes and cause oxidative stress, lipid peroxidation, DNA fragmentation, apoptosis and necrosis in primary hepatocytes, contributing to the liver toxicity induced by Cd2+.