海南省三大河流及地下水硝酸盐含量调查分析

Investigation of Nitrate Content in Major Rives and Underground Water in Hainan Province

通过调查分析海南省三大河流及地下水硝酸盐的含量,结果表明:三大河流水体的硝酸盐含量比较低,受硝酸盐的污染程度较低。其中,硝酸盐平均含量以万泉河流域及地下水水体中最低,分别为0.7560mg/L和0.1900mg/L;南渡江流域及地下水水体中的硝酸盐含量最高,分别为1.6500mg/L和1.0300mg/L;总体上河流水体中硝酸盐的含量比地下水中的硝酸盐含量高,且极显著相关,r**=0.626;从变异情况看,地下水的变化比较小,河流水体的硝酸盐含量变异程度则较大,其中以万泉河水体变异最大,达147%。

studies of nitrate concentration in major rivers and underground water take into account the following significant factors： nitrogen fertilizer, balance of nutrients in plantation, protection of water source; development of eco-agricuhure; eco-travel, eco-industry, living sewage management and emission. In accordance with these factors, this paper analyzes the nitrate content in the major rivers and underground water in Hainan province and makes the following findings： nitrate content and pollution extent are lower on the whole： the nitrate content of Wanquan river and its ground water are lowest, 0.756mg/L, and 0.1 90mg/L respectively, but those of the Nandu river and its underground water are highest, 1.65mg/L and 1.03mg/L respectively; the nitrate contents in rivers are higher than those in underground water and they are closely correlated： r＊＊=0.626; the nitrate contents in rivers change more than those in underground water, and the greatest variety is found in Wangquang river, reaching 147%.