Eutrophication has been one of threats to the aquatic environment nowadays. Learning the water quality and analyzing the possibility of eutrophication of Weiming Lake, an irreplaceable symbol of Peking University, is the scientific basis to improve the water quality and a reference to the protection of other artificial lakes. Hardly disturbed by anthropogenic activities, the water quality of Weiming Lake was good in nitrogen related indexes, but the indexes of COD, TP, and DO were at or even worse than Level V water quality in all the regions and seasons. The average TLI indexes of Weiming Lake was 56.1, slightly eutrophication. PCR-DGGE analysis showed the diversity of sediment bacterial community varied through seasons, higher in spring and summer, highly related with the location and the weight of nutrients in summer and autumn. Linear regression showed that the activities of algae may influence the sediment bacterial community through nitrogen fixation.

The paper focuses on the study of the copper supply risk conception and the process of risk identification and analysis in risk management, based on the risk theory. The authors establish a list of China copper supply risk through risk identification, and build up copper supply risk matrix through risk analysis. Based on the risk matrix, the copper supply risk is at a higher level in 2013. The reason is the importance of copper resources in the economy is higher, thus expanding the copper resources supply risk. In addition, social development and environmental regulation of supplying countries also have a great impact on China’s copper supply, yet the political risk and economic risk is relatively moderate.

Recently, the environmental mapping is an important application of high spatial resolution remote sensing images. However, with the improvement of spatial resolution, the size and land cover details of imagery significantly increase. Those bring on some hurdles to image processing. In this paper, some key processing techniques are discussed including the choice of spatial and pixel resolution, color match and recovering. Actual works proves that these methods are very useful for environmental mapping based on high spatial resolution remote sensed images.