Performance of Soil-Plant Systems in Agricultural Pollutants Removal in Surface Runoff

Abstract:

Simulated runoff was conducted on self-designed soil bins to compare the effectiveness of 6m treating systems consisting of contrast system(bear soil),soil-tall fescue system and soil-alfalfa system in reducing SS, NO3--N,NH4+-N,TDP and PP. The concentration reductions were greater in soil-plant system compared with contrast. Vegetation type (Tall fescue and alfalfa) had somewhat affection on contaminant removal. The mean concentration reductions of SS, NO3--N,NH4+-N,TDP and PP reached 86.61%,25.83%,52.03%,26.53%and 76.59% under tall fescue, which were slightly higher than Alfalfa. However, the load reductions of alfalfa neared to that of tall fescue due to more water detained, which made Alfalfa show the same potential in runoff clarification as tall fescue. The removal efficiency of NO3--N and NH4+-N decreased significantly with increasing concentration, while the changes of SS ,PP and TDP were much smaller, which meant the conditions of vegetation and soil in this study were not enough to deal with NO3--N and NH4+-N increasing, and the ground roughness could bear SS and PP increasing. Most SS and PP were trapped in first 2m and it was ineffective to increase the runoff distance beyond 4m for removal. The reduction of resolved compound occurred uniformly along the runoff and it related with runoff extension distance linearly.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 2640-2648
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.2640
• Online since: May 2012
• Authors: Wei Jie Huo, Huai Dong Zhou, Ling Hua Liu, Jia Peng Wu
• Keywords: Agricultural Pollutants, Removal Performance, Simulated Runoff Event, Soil-Plant System

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