关键词：
面源污染物;相对拦截率;植物篱;坡耕地;红枫湖
摘 要：
在红枫湖上游15°的坡耕地上设置30个植物篱径流小区,小区水平投影面积100 m2,顺坡长20 m,横坡宽5 m。在小区内横坡等距种植三带植物篱,植物篱带呈双行"品"字型种植模式,带长5 m,带宽0.15 m。通过监测该年度天然降雨下每个径流小区产生的地表径流、泥沙和养分情况,探讨了在相同种植模式下9种不同物种植物篱对坡耕地面源污染物的拦截效率及其影响因素。结果表明:灰毛豆植物篱截流效应最佳,相对径流拦截率为91.75%;紫花苜蓿植物篱减沙效应最佳,相对泥沙拦截率为69.25%。灰毛豆植物篱能更有效地抑制湖泊水体氮、磷元素的富集进程,其中,对坡耕地氮相对拦截量为283.03 g·hm-2,相对拦截率为70.08%;对坡耕地磷相对拦截量为185.92 g·hm-2,相对拦截率为80.21%。胡枝子植物篱能更有效地抑制湖泊水体钾元素的富集进程,对坡耕地钾相对拦截量为135.11 g·hm-2,相对拦截率为86.08%;灰毛豆次之,对坡耕地钾相对拦截量为125.13 g·hm-2,相对拦截率为79.72%。
译 名：
Effects of Different Plant Species Hedgerows on Interception of Non-point Source Pollutants in Sloping Cultivated Land
作 者：
TIAN Xiao;ZHOU Yun-chao;CAI Xian-li;MA Li-ping;LIU Xiao-yun;College of Forestry, Guizhou University;Research Center of Forest Resources and Environment in Guizhou Province;Huishui Water Conservancy Bureau in Guizhou Province;
关键词：
non-point source pollutants;;relative interception rate;;hedgerow;;sloping cultivated lands;;Hongfeng Lake
摘 要：
Hedgerows play important roles in control over the spread of pollutants in the environment. To investigate the effect of plant species of hedgerows on the intercepting efficiency of non-point source pollutants, a field experiment was conducted in a sloping cultivated land in the upstream of Hongfeng Lake, Guizhou. Thirty runoff plots(20 m long × 5 m width) with three banded hedgerows at equal distance were established in 15 degree sloping cultivated land. The hedgerows was planted in a criss-crossed double rows with 5 m length and 0.15 m width. Quantity of surface runoff, silt and nutrient was monitored in each runoff plot under natural raining in 2010. Results showed that there were only five surface runoffs observed after rainfall in 2010, of which two were stronger while three weaker but lasted for longer time.The greatest runoff interception was observed in the plot with Tephrosia purpurea(L.) Pers. hedgerows, with relative surface runoff interception rate of 91.75%, and the greatest silt interception was found in the plot of Medicago sativa L. hedgerows, with relative interception rate of69.25%. Tephrosia purpurea(L.) Pers. could effectively reduce N and P loss, with interception rate about 70.08% for N(283.03 g·hm-2)and 80.21% for P(185.92 g·hm-2). However, the greatest K interception was measured in the plot with Lespedeza bicolor Turcz and followed by Tephrosia purpurea(L.) Pers. Their relative interception rates were 86.08%(135.11 g·hm-2) and 79.72%(125.13 g·hm-2), respectively. The present results show that hedgerows would be of great significance in controlling non-point source pollution in sloping farming area.
