Potential Efficiency of Grassy or Shrub Willow Buffer Strips against Nutrient Runoff from Soybean and Corn Fields in Southern Quebec, Canada
| Autor: | Marcelo Pedrosa Gomes, Marc Lucotte, Laurent Lepage, Michel Labrecque, Rachel Perron, Philippe Juneau, Élise Smedbol, Sophie Maccario, Marie Larocque, Louise Hénault-Ethier, Marie Eve Lamoureux Laprise |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Riparian buffer Nitrogen 020209 energy Buffer strip 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law engineering.material Poaceae Zea mays 01 natural sciences Non-Point Source Pollution Nutrient 0202 electrical engineering electronic engineering information engineering Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology 2. Zero hunger geography geography.geographical_feature_category Quebec Agriculture Phosphorus Salix 15. Life on land Pollution 6. Clean water Biodegradation Environmental Agronomy Snowmelt Loam Soil water engineering Environmental science Soybeans Fertilizer Surface runoff Environmental Monitoring |
| Zdroj: | Journal of Environmental Quality. 48:352-361 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2016.10.0391 |
| Popis: | Riparian buffer strips (RBS) are encouraged to control agricultural diffuse pollution. In Quebec Province, Canada, a policy promotes 3-m-wide RBS. Abiding farmers minimally maintain herbaceous vegetation, but nutrient retention efficiency could be improved with woody biomass. This work aimed to assess if fast-growing willows ( Seemen 'SX64') could reduce nutrient loads to a stream, in addition to yielding biomass. Triplicate treatments of two stem densities and a herbaceous control plot were monitored from 2011 to 2013 in a randomized block design on agricultural fields of the St. Lawrence Lowlands with sandy loam (Saint-Roch-de-l'Achigan [SR]) and organic-rich (Boisbriand [BB]) soils. Runoff, interstitial water, and water from the saturated zone were sampled 16 (SR) and 14 (BB) times to quantify nutrient buffering (NO, NH, P, and K). Sampling campaigns followed (i) snowmelt or ≥15-mm natural precipitation events after (ii) fertilization and (iii) glyphosate-based herbicide applications. Concentration reduction before and after the RBS was highest for nitrates (77-81% in runoff at BB, 92-98% at 35- to 70-cm depth at SR) just after fertilization, when edge-of-field concentrations peaked. Total P removal was observed in runoff after fertilization at SR, and K removal was punctually witnessed at BB. Riparian buffer strips were inefficient for NH and dissolved P removal, and RBS effluents exceeded aquatic life protection standards. plantations, irrespective of stem density, were not more efficient than herbaceous RBS. This shows that without fertilizer input reductions, narrow RBS are insufficient to protect streams from excess nutrients in corn ( L.) and soybean [ (L.) Merr.] crops. |
| Databáze: | OpenAIRE |
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