<abstract xmlns="http://www.w3.org/1999/xhtml">To investigate the retention efficiency and mechanism of nitrogen of Vegetative filter strips (VFSs) in the Danjiangkou Reservoir area, simulated runoff discharging experiments were carried out in a new-established <italic>Bermuda</italic> VFS. The results showed that the <italic>Bermuda</italic> VFS reduced 73.1-86.1 % of surface runoff through infiltration. The outflow rate of runoff increased first and then became stable with time. The concentration reduction rates (<italic>CRRs</italic>) and load reduction rates (<italic>LRRs</italic>) of NH3-N increased initially and then decreased with the increase of inflow concentration. The average <italic>CRRs</italic> and <italic>LRRs</italic> of NH3-N in three treatments ranged 66.1-90.3 % and 90.0-96.7 %, respectively. The concentration reduction of NH3-N was primarily achieved by soil adsorption. The optimal inflow concentration of NH3-N for the optimum <italic>CRR</italic> was between 0.65 and 3.52 mg/dm3. The <italic>CRRs</italic> and <italic>LRRs</italic> of NO3-N fluctuated between 6.8-14.0 % and 72.0-77.9 % in three treatments. The concentration reduction of NO3-N was primarily achieved by plant uptake and soil microbe assimilation. The optimal inflow concentration of NO3-N for optimum <italic>CRR</italic> exceeded 6.78 mg/dm3. The <italic>CRRs</italic> and <italic>LRRs</italic> of TN increased with the increase of inflow concentrations. The average <italic>CRRs</italic> in the low, moderate and high treatments reached 9.7, 14.8 and 27.4 %, respectively, and the average <italic>LRRs</italic> reached 72.1, 74.3 and 81.2 %, respectively. The optimal inflow concentration of TN for optimum <italic>CRR</italic> exceeded 10.21 mg/dm3. The study showed that <italic>Bermuda</italic> grass can retain nitrogen in runoff efficiently and should be promoted around the Danjiangkou reservoir.</abstract>

To investigate the retention efficiency and mechanism of nitrogen of Vegetative filter strips (VFSs) in the Danjiangkou Reservoir area, simulated runoff discharging experiments were carried out in a new-established Bermuda VFS. The results showed that the Bermuda VFS reduced 73.1-86.1 % of surface runoff through infiltration. The outflow rate of runoff increased first and then became stable with time. The concentration reduction rates (CRRs) and load reduction rates (LRRs) of NH3-N increased initially and then decreased with the increase of inflow concentration. The average CRRs and LRRs of NH3-N in three treatments ranged 66.1-90.3 % and 90.0-96.7 %, respectively. The concentration reduction of NH3-N was primarily achieved by soil adsorption. The optimal inflow concentration of NH3-N for the optimum CRR was between 0.65 and 3.52 mg/dm3. The CRRs and LRRs of NO3-N fluctuated between 6.8-14.0 % and 72.0-77.9 % in three treatments. The concentration reduction of NO3-N was primarily achieved by plant uptake and soil microbe assimilation. The optimal inflow concentration of NO3-N for optimum CRR exceeded 6.78 mg/dm3. The CRRs and LRRs of TN increased with the increase of inflow concentrations. The average CRRs in the low, moderate and high treatments reached 9.7, 14.8 and 27.4 %, respectively, and the average LRRs reached 72.1, 74.3 and 81.2 %, respectively. The optimal inflow concentration of TN for optimum CRR exceeded 10.21 mg/dm3. The study showed that Bermuda grass can retain nitrogen in runoff efficiently and should be promoted around the Danjiangkou reservoir.

Retention Efficiency of Vegetative Filter Strips for Nitrogen in Danjiangkou Reservoir Area, Central China

Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River)

Changjiang Water Resource Protection Institute, Yangtze River Water Resource Commission

Ecological Chemistry and Engineering S

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

To investigate the retention efficiency and mechanism of nitrogen of Vegetative filter strips (VFSs) in the Danjiangkou Reservoir area, simulated runoff...

Retention Efficiency of Vegetative Filter Strips for Nitrogen in Danjiangkou Reservoir Area, Central China

Published Online: Jul 18, 2019

Page range: 279 - 297

DOI: https://doi.org/10.1515/eces-2019-0020

Keywords
vegetative filter strips, inflow concentration, retention efficiency, non-point source nitrogen pollution, retention mechanism, infiltration

© 2019 Junshan Lei et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Retention Efficiency of Vegetative Filter Strips for Nitrogen in Danjiangkou Reservoir Area, Central China

Published Online: Jul 18, 2019

Page range: 279 - 297

DOI: https://doi.org/10.1515/eces-2019-0020

Keywordsvegetative filter strips, inflow concentration, retention efficiency, non-point source nitrogen pollution, retention mechanism, infiltration

© 2019 Junshan Lei et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
vegetative filter strips, inflow concentration, retention efficiency, non-point source nitrogen pollution, retention mechanism, infiltration