کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4432812 | 1619942 | 2007 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Groundwater nitrate following installation of a vegetated riparian buffer Groundwater nitrate following installation of a vegetated riparian buffer](/preview/png/4432812.png)
Substantial questions remain about the time required for groundwater nitrate to be reduced below 10 mg L− 1 following establishment of vegetated riparian buffers. The objective of this study was to document changes in groundwater nitrate–nitrogen (NO3–N) concentrations that occurred within a few years of planting a riparian buffer. In 2000 and 2001 a buffer was planted adjacent to a first-order stream in the deep loess region of western Iowa with strips of walnut and cottonwood trees, alfalfa and brome grass, and switch grass. Non-parametric statistics showed significant declines in NO3–N concentrations in shallow groundwater following buffer establishment, especially mid 2003 and later. The dissolved oxygen generally was > 5 mg L− 1 beneath the buffer, and neither NO3–N nor DO changed significantly under a non-buffered control area. These short-term changes in groundwater NO3–N provide evidence that vegetated riparian buffers may yield local water-quality benefits within a few years of planting.
Journal: Science of The Total Environment - Volume 385, Issues 1–3, 15 October 2007, Pages 297–309