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通过测定河岸带常见植被类型下的土壤酶活性,比较其去污效果,分析土壤酶活性与TN、TP、NH4+-N、COD等农业面源污染物去除率的相关性。结果表明,不同植被类型表层土壤酶活性存在显著差异(P<0.05),灌草、草本酶活性较大,乔灌草次之,乔草最小,而不同植被河岸带对农业面源污染物的去除率也表现出基本相同的规律,因此对农业面源污染去除效果最好的河岸带植被类型配置应为灌草或草本(芦苇);不同植被深层土壤酶活性基本不存在显著差异。由相关性分析可知,TN、NH4+-N去除率与表层土壤脲酶活性呈显著相关关系,而COD去除率与土壤脲酶的相关性不显著;TP、COD去除率与土壤磷酸酶活性的相关性显著。研究结果为利用土壤酶活性强度作为评价河岸带净化效果的指标提供了理论依据。
The soil enzyme activities under common vegetation types of riparian zone were determined and their soil decontamination effects were compared. The correlation between soil enzyme activities and removal rates of TN, TP, NH4 + -N, COD and other agricultural non-point source pollutants was analyzed. The results showed that there were significant differences in the soil enzyme activities of different types of vegetation (P <0.05). The activities of shrubs and herbs were greater, followed by the shrubs and shrubs, and the lowest among the shrubs. However, Removal rate also showed basically the same law, so the best removal efficiency of agricultural non-point source riparian vegetation type configuration should be shrubs or herbs (Phragmites communis); different vegetation depth of soil enzyme activity basically no significant difference. Correlation analysis showed that TN, NH4 + -N removal rate was significantly correlated with surface soil urease activity, while COD removal rate was not significantly correlated with soil urease; TP, COD removal rate and soil phosphatase activity were significantly correlated . The results provide a theoretical basis for the use of soil enzyme activity as an indicator to evaluate the purification effect of riparian zone.