开远市地表水重金属污染现状及变化趋势分析

Analysis of the Heavy Metal Pollution and Variation Trend in Surface Water in Kaiyuan City

重金属对环境的严重威胁正逐渐成为全球性问题,水环境重金属污染问题已十分普遍,国内外已制定了许多相关的法律法规、评价标准和评价方法。水环境重金属污染的评价主要包括水质直接评价和沉积物评价。根据开远市20122014年连续3年的监测资料,采用直接评价法,对开远市地表水中生物毒性显著的重金属汞、镉、铅、铬以及类金属砷污染现状进行评价,分析了主要污染物变化趋势及产生污染的原因,提出了防治建议。

The United States in 2014 issued a new farm bill. In order to study and draw lessons from the United States to the farmers＇ income protection policy,by comparing farm bill of 2014 and 2008,it was found that farm bill in 2014 has new development in the reform of the income support for agriculture and agricultural risk guarantee,resources and environment protection project. The adjustment of the United States＇ agriculture policy has the enlightenment to farmers＇ income policy development in China： to improve the efficiency of the agricultural subsidy policy and improve the agricultural insurance system,perfect the price forming mechanism,strengthen the agricultural ecological management.