论文部分内容阅读
过滤带建立后,因上部土地利用变化,导致土壤和植被条件发生改变,过滤带功能亦可能会有所变化。美国生态学者就相关问题进行了10 a的试验研究。结果表明,1995~1997年新植草被出流溶液质量浓度逐年下降,新植乔灌草植被的拦蓄效率起初与作物植被相近,随后增大到与老草植被接近,这与植被盖度的增加和径流速度的下降相同,表明入渗量增加引起过滤带功能提高;且新植草被与新植乔灌草植被具有相似的变化规律。由此可见,过滤带在建立后几年中功能的增强主要与土壤的入渗特性变化有关,且建立后10 a草被过滤带与乔灌草植被有着相似的过滤效果。但此项研究模拟降雨强度较小,不能反映整体过滤带的功能,相对大雨强下的结果有待于进一步研究。
After the filter belt is established, the function of the filter belt may also change due to the change of soil and vegetation caused by the change of the upper land use. American ecologists conducted a 10-year experimental study on related issues. The results showed that the mass concentration of effluent from 1995 to 1997 decreased year by year. The interception efficiency of the new plantation of shrub and shrub was similar to crop vegetation at first, then increased to close to the vegetation of old grass, which was related to the increase of vegetation coverage The same as the decrease of runoff velocity, it shows that the infiltration capacity increases the function of filter belt; and the new grass is similar with the newly planted shrub and shrub vegetation. It can be seen that the enhancement of the function of the filter belt in the years after its establishment is mainly related to the infiltration characteristics of the soil. After the establishment of the filter belt, the filter belt has similar filtering effects with the arbor / shrub and grass vegetation. However, this study simulates the rainfall intensity is small, can not reflect the function of the overall filter belt, the results under relatively heavy rainfall needs further study.