河岸带对面源污染物的消减效果研究

The Reduction Effect of Riparian Zone to Non-point Source Pollution

用氨氮浓度2.0 mg/L和总磷浓度1.2 mg/L的污染水,在坡度20°的条件下,对6种植被类型下土壤进行模拟壤中流试验,分别在6处渗透距离取水样测定氨氮、总磷含量。结果表明:污染水渗透到1.5 m处,6种植被类型土壤水样的氨氮含量均小于1.0 mg/L,达到Ⅲ类水质标准;除CL(农田)类型外,其它各植被类型土壤水样的总磷含量均小于0.4 mg/L,达到Ⅴ类水质标准。渗透到3 m处,水样中氨氮含量均小于0.5 mg/L,达到Ⅱ类水质标准;除CL类型外,其它各植被类型土壤水样的总磷含量均小于0.2 mg/L,达到Ⅲ类水质标准,其中对氨氮、总磷消减效果均较好的植被类型为CF(针阔混交林)、GF(珍珠梅灌木林),消减率均超过97%。污染水经过CF、GF植被类型土壤的6处渗透距离,氨氮含量差异不显著,GL(野生草地)、LA(落叶松人工林)、CL、SH(阔叶杂木林)植被类型差异极显著;LA、GF植被类型总磷含量差异不显著,CL类型差异显著,GL、CF、SH类型差异极显著。各渗透距离处不同植被类型土壤水样氨氮、总磷含量均差异极显著。

With the ammonia concentration 2.0 mg/L and TP concentration 1.2 mg/L of the polluted water, in the conditions of 20° slope, for the soil under 6 types of vegetation to simulation of subsurface flow experiment, take Water samples at six penetration distance, determind ammonia nitrogen, total phosphorus content. The results showed that, polluted water to infiltrate at 1.5 m, all of six types of vegetation nitrogen content of soil samples were less than 1.0 rag/L, achieve to Ⅲ water quality standard; in addition to CL type, the other vegetation types of the total phosphorus content of soil samples were less than 0.4 mg/L,to grade V standard;penetrate into the 3 m department, nitrogen content in water samples were less than 0.5 mg/L, reached Ⅱ water quality standard;in addition to CL type, the other vegetation types of the total phosphorus content of soil samples were less than 0. 2 mg/L, reached Ⅲ water quality standard, CF, OF had better reduction in ammonia nitrogen and TP in water samples, reduction rate over 97%. Pollution water through the six penetration distance of CF, GF vegetation types had no significant difference in ammonia content, GL, LA, CL, SH vegetation types had very significantly different. The TP content of LA, OF vegetation types was not significant. CL type had significant difference, GL, CF, SH types had very significant difference. At each penetration distance, different vegetation types of soil and water samples, which ammonia nitrogen, total phosphorus content were significantly different.