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| Interception of Runoff, Sediment, Nitrogen and Phosphorus by Vegetative Filter Strips with Different Width in a Simulated Experiment |
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| KeyWord:vegetative filter strips; runoff; sediment; total nitrogen; total phosphorus; interception effectiveness |
| Author Name | Affiliation | | SHEN Xiao-bo | College of Forestry, Central South University of Forestry Technology, Changsha 410000, China
Beijing Research and Development Center for Grass & Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | CHEN Chuan-sheng | College of Forestry, Central South University of Forestry Technology, Changsha 410000, China | | ZHANG Zhang | No. 203 Research Institute in Nuclear Industry, Xianyang 712100, China | | SUN Xiao-tao | College of Forestry, Central South University of Forestry Technology, Changsha 410000, China | | XIAO Bo | Beijing Research and Development Center for Grass & Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China |
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| Abstract: |
| Enormous uses of mineral fertilizers greatly increase crop yields, but may cause water pollutions. Vegetative filter strips（VFS）, which planted along streams or lakes to remove sediments and nutrients carried in runoff, have been regarded as one of the best management practices in reducing non-point source pollution in many countries. Interception effectiveness of pollutants by VFS is largely dependent on the width and type（grasses, shrubs, trees, or their mixtures） of VFS and pollutant forms（particle or soluble）. A simulated experiment was conducted in this study to determine the interception effectiveness of runoff, sediment, nitrogen, and phosphorus by artificial grass-like VFS with different widths（1 m, 2 m, and 3 m）. The interception effectiveness of runoff and pollutants were greatly influenced by the width of VFS under the same conditions（water flow rate and speed were 0.173 L·s-1 and 0.7 m·s-1, respectively）. The VFS with 1 m, 2 m, and 3 m width respectively reduced the outflow of runoff by 32%, 51%, and 69%, and the outflow of sediment by 78%, 88%, and 92%. Correspondingly, the outflow of total nitrogen was decreased by 65%, 75%, and 84%, and that of total phosphorus by 80%, 93%, and 95%, respectively. The total outflow of sediment, nitrogen, and phosphorus was significantly positively correlated with the outflow of runoff（amount of sediment：r1=0.69, r2=0.84, r3=0.63; amount of total nitrogen：r1=0.98, r2=0.89, r3=0.95; amount of total phosphorus：r1=0.62, r2=0.47, r3=0.41, respectively）. The results indicate that grass VFS are very effective in reducing runoff, sediment, nitrogen, and phosphorus and controlling agricultural non-point source pollution. |
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