Effects of a forested state park on stream nutrient concentrations in an agriculturally dominated watershed in the U.S. Midwest

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Tessa Farthing, Eileen Rintsch, Owen Larson, Bartosz P. Grudzinski, Thomas J. Fisher, Jessica L. McCarty
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Abstract

Agricultural land cover in the U.S. Midwest is a major source of nutrient pollution that has led to impairment of stream water quality. This study examines the impact of a forested state park on nutrient concentrations within an agriculturally dominated watershed. Water samples were collected over a 2-year study period from eight stream sampling sites along four creeks and processed for total nitrogen (TN), nitrate ( NO 3 - N ), total phosphorus (TP), and orthophosphate ( PO 4 3 - P ). Hydrology, channel morphology, and remotely sensed land cover and vegetation data were also collected and analyzed within the study area. Results indicate that water quality responses to a forested state park vary between TN, NO 3 - N , TP, and PO 4 3 - P , and water quality variables are uniquely influenced by watershed and stream characteristics. The greatest water quality benefits most frequently occurred within the two smallest study streams with the greatest residence times and proportion of watershed areas within the forested state park. Overall, the greatest improvements to water quality occurred during periods of low stream discharge and when riparian vegetation was greenest. The results of this study suggest that conservation of forested areas within agriculturally dominated watersheds can provide water quality improvements in the U.S. Midwest. Targeting watersheds that drain small streams with long residence times for conservation may be most beneficial to improving water quality.

Abstract Image

州立森林公园对美国中西部以农业为主的流域中溪流营养物质浓度的影响
美国中西部的农业用地是导致溪流水质恶化的主要营养污染源。本研究考察了一个州立森林公园对一个以农业为主的流域内营养物浓度的影响。在为期两年的研究期间,从四条溪流的八个溪流取样点采集了水样,并对水样进行了总氮(TN)、硝酸盐()、总磷(TP)和正磷酸盐()的检测。研究区域内还收集并分析了水文、河道形态以及遥感土地覆盖和植被数据。结果表明,森林州立公园的水质响应在 TN、TP 和正磷酸盐之间存在差异,水质变量受到流域和溪流特征的独特影响。最大的水质效益最常出现在两条最小的研究溪流中,这两条溪流在国家森林公园内的停留时间和流域面积比例最大。总体而言,水质改善最大的时期是溪流流量较低和河岸植被最绿的时期。这项研究结果表明,在以农业为主的流域内保护林区可以改善美国中西部地区的水质。针对排水量小、停留时间长的流域进行保护,可能最有利于改善水质。
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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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