Evaluation of agricultural non-point source pollution infiltration on clogging and nitrogen leaching effects in BRCs with different plants in dryland areas
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View abstract on PubMed
Summary
This summary is machine-generated.Plant choice in bioretention cells (BRCs) impacts nitrogen removal and clogging. Buxus showed increased permeability but reduced nitrogen removal, unlike Ophiopogon, highlighting plant selection
Area Of Science
- Environmental Science
- Agricultural Engineering
- Soil Science
Background
- Agricultural non-point source pollution, particularly nitrogen pollution, is a significant environmental challenge linked to expanding high-standard farmland.
- Green infrastructure (GI), specifically bioretention cells (BRCs), is widely used to mitigate nitrogen pollution from agricultural runoff.
- Long-term BRC effectiveness can be compromised by system clogging and nitrogen leaching, necessitating research into plant impacts.
Purpose Of The Study
- To investigate the effects of different plant species on the removal of total suspended solids (TSS), total nitrogen (TN), and nitrate-nitrogen (NO3-N) in BRCs.
- To assess the influence of plant choice on BRC system clogging and nitrogen leaching.
- To compare the performance of woody plants (Buxus) and herbaceous plants (Ophiopogon) in simulated BRC environments.
Main Methods
- Designed and conducted laboratory experiments using three BRC simulation devices.
- Investigated the removal of TSS, TN, and NO3-N through simulated pollutant infiltration.
- Monitored system permeability, plant root growth (length, volume, surface area), microbial communities (actinomycetes), and soil enzyme activity.
Main Results
- Buxus and Ophiopogon treatments showed slightly lower TSS removal than the control but significantly enhanced permeability (Buxus: +24.47%).
- The Buxus group exhibited significantly reduced TN (by 31.82%) and NO3-N (by 41.25%) removal rates compared to the control.
- Ophiopogon displayed superior root development (length, volume, surface area) after five months compared to Buxus, suggesting better system stability.
Conclusions
- Plant selection critically influences nitrogen cycling and clogging dynamics in BRCs.
- Buxus's reduced nitrogen removal may be attributed to its less developed root system, lower actinomycete abundance, and decreased soil enzyme activity.
- Ophiopogon shows potential for more effective long-term performance in BRCs due to enhanced root growth, warranting further investigation.
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