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In view of the problem of heavy metals in river sediments, the contents and spatial distribution of organic matter, total nitrogen, total phosphorus and six heavy metals (Cr, Ni, Cu, As, Cd, Pb) in surface sediments were analyzed, which were acquired from Chaohu small basin. The sources of heavy metals were analyzed by the method of heavy metal enrichment coefficient and principal component analysis, and the ground accumulation index and potential were utilized. The ecological risk of heavy metals was evaluated by ecological hazard index. The results showed that the average contents of organic matter, total nitrogen and total phosphorus in surface sediments were 162 g·kg^-1, 3707.2 mg·kg^-1, 2007.4 mg·kg^-1.The average contents of Cr, Ni, Cu, As, Cd and Pb were 51.66, 22.97, 36.41, 7.68, 0.40, 33.14 mg·kg^-1, respectively. The contents of Cu, Cd and Pb were 1.73, 6.01 and 1.26 times higher than the background values of surface soil in Anhui Province. Cu, Cd, Pb in the sediments have varying degrees of enrichment, and they are closely related to human activities. The degree of Cd pollution in sediments is high, and the potential risk grade of heavy metals is medium, but the overall environmental pollution is mild.

Abstract:In order to solve the problems of poor real-time performance, low efficiency and high cost of traditional water quality monitoring methods in Chaohu, a water quality monitoring system is designed based on ZigBee technology. Firstly, the paper analyzes the important factors of current water pollution in Chaohu; the characteristics of water quality, such as pH value, temperature and dissolved oxygen are established, and the overall structure of the monitoring system is given. Secondly, according to the characteristics of the parameters, the corresponding signal conditioning circuit is designed, and the formula for calculating the characteristic parameters is derived.Finally, according to the function of various nodes, the software flow based on the ZigBee protocol stack is designed,and the experiment is carried out by means of the way of carrying the nodes. The experimental results show that the method of wireless sensor network has low cost and high reliability, and can meet the application requirements of
water quality monitoring.

Abstract: Since the reform and opening up policy, China has made remarkable achievements in many fields.China爷s foreign trade has also followed the trend of development, gaining more and more discourse power. In this paper, Anhui province was selected as the research object. Firstly, the current situation and existing problems about Anhui province爷s foreign trade are analyzed. Then, based on the time series data in 1981—2015 of Anhui province,we construct var model to analyze the influence of human capital and urbanization on foreign trade. According to the impulse response function variance decomposition model, the results show that urbanization has a deeper impact on foreign trade than human capital. The positive impact on urbanization is good for the development of export  trade. But for import trade, the human capital and urbanization play an unimportant role. Finally, according to the result of empirical analysis, in order to improve the level of foreign trade, the government should increase
investment in education, improve urban infrastructure construction and urban employment opportunities.

Abstract: Fusarium oxysporum is the pathogen of blueberry root rot. The symbiotic mycorrhizal fungi of blueberry root play a role in the growth and development of blueberry and can antagonize harmful microorganisms. In this study, mycorrhizal fungi were isolated from blueberry roots in different areas of Anhui Province. The strains antagonistic to Fusarium oxysporum were screened by bacteriostatic experiment to explore the biological characteristics of antagonistic bacteria and optimize the culture conditions. The results showed that the root infection of blueberry was quite different in different areas of Anhui province. A total of 17 strains of endophytic mycorrhizal fungi were isolated, of which 6 strains were mycorrhizal fungi with antagonistic effect of Fusarium oxysporum.Trichoderma spinosum Hfsu02 had the best antagonistic effect. Under the condition of shaking flask culture in basic
culture medium, the optimum growth temperature was 25益, the optimum pH was 4, the logarithmic growth period was 12 ~112 h, and the highest yield of dry weight of mycelium was 2.76 g/L. The screening and culture optimization of Trichoderma spinosum Hfsu02 provide theoretical basis for the control of blueberry root rot, and have important guiding significance in the biological control of blueberry root rot.