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| Effectiveness of switchgrass vegetative filter strip in intercepting pollutants and promoting plant biomass |
| Received:August 05, 2015 |
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| KeyWord:simulated rainfall experiment;switchgrass Vegetative Filter Strip(VFS);purification effect;yield and quality promotion |
| Author Name | Affiliation | E-mail | | SUN Peng-cheng | Institute of Soil and Water Conservation, Northwest N & F University, Yangling 712100, China | | | GAO Jian-en | Institute of Soil and Water Conservation, Northwest N & F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, China
College of Water Resources and Architectural Engineering, Northwest N & F University, Yangling 712100, China | gaojianen@126.com | | WANG Xian-wen | College of Water Resources and Architectural Engineering, Northwest N & F University, Yangling 712100, China
Surveying & Designing Institute(group)Co. Ltd., Xinjiang Production and Construction Crops, Urumchi, 830002, China | | | GAO Zhe | Shaanxi Petroleum Chemical Engineering and Construction Co. Ltd., Yangling 712100, China | |
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| Abstract: |
| The serious soil and water erosion in the Loess Plateau has caused non-point source pollution and shortage of water resources. In this study, a series of simulated rainfall experiments with 6 rainfall intensities were conducted using the self-designed efficient agricultural water filter system. The pollutant outputs under different rainfall intensities were measured. The purification efficiencies and biomass production of the Switchgrass Vegetative Filter Strip(VFS) with different lengths were also evaluated. Results indicated that:1)with increase in rainfall intensity, the concentrations of sediments and total phosphorus(TP) in overland flow increased, while total nitrogen(TN) concentrations decreased. COD decreased initially but increased thereafter; 2)Both 3 m-and 5 m-length VFS significantly reduced sediment and TP concentrations, with no significant differences between these two lengths. The COD reduction happened only in the 5 m-length VFS. However, neither of these two lengths of VFS reduced TN concentrations; 3)Yield and quality of switchgrass in the VFS were better than those of field-grown switchgrass. In the VFS, switchgrass closer to the runoff entrance yielded higher biomass. The dry matter yield, protein yield and starch yield of switchgrass were respectively 29%, 53%, and 23% higher in the VFS than in the fields. The present results indicated that switchgrass in VFS utilized soil and water resources efficiently and would have promising applications in the Loess Plateau area. |
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