科研之友
微信
新浪微博
Facebook
分享链接
摘要
The effects of intensive banana production with high mineral-fertilizer application and of extensive pastures were compared regarding water quality in a lowland region of SE Mexico. We monitored NO3-, NO2-, and PO43- concentrations in groundwater (80 m depth), subsurface water (5 m depth), and surface water (open-ditch drainage) at monthly intervals for a one-year period. Irrespective of the land use, the NO3- concentrations in all water bodies were lower than the threshold value for drinking water and aquatic life. Particularly in areas with intense banana production, the NO2- contents in water exceeded the safety thresholds for drinking water of 1.0 mg L-1 (WHO, 2006) and aquatic ecosystems of 0.2 mg L-1 (OATA, 2008). Water from pastureland showed significantly higher PO43 concentration than that from the banana plantation, indicating a high risk of eutrophication. There is a need to provide recommendations for optimal time and amount of N application in commercial banana production and for limitation of P inputs in pasturelands to avoid further contamination of water bodies.
- 出版日期2012-8
