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| Effects of Different Plant Species Hedgerows on Interception of Non-point Source Pollutants in Sloping Cultivated Land |
| Received:September 12, 2014 |
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| KeyWord:non-point source pollutants;relative interception rate;hedgerow;sloping cultivated lands;Hongfeng Lake |
| Author Name | Affiliation | E-mail | | TIAN Xiao | College of Forestry, Guizhou University, Guiyang 550025, China
Research Center of Forest Resources and Environment in Guizhou Province, Guiyang 550025, China
Huishui Water Conservancy Bureau in Guizhou Province, Huishui 550600, China | | | ZHOU Yun-chao | College of Forestry, Guizhou University, Guiyang 550025, China
Research Center of Forest Resources and Environment in Guizhou Province, Guiyang 550025, China | fc.yczhou@gzu.edu.cn | | CAI Xian-li | College of Forestry, Guizhou University, Guiyang 550025, China | | | MA Li-ping | College of Forestry, Guizhou University, Guiyang 550025, China | | | LIU Xiao-yun | College of Forestry, Guizhou University, Guiyang 550025, China | |
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| Abstract: |
| 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 of 69.25%. 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. |
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