Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1903226116 |
Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality | |
Stackpoole, Sarah M.1; Stets, Edward G.2,3; Sprague, Lori A.1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:41页码:20562-20567 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Phosphorus (P) fertilizer has contributed to the eutrophication of freshwater ecosystems. Watershed-based conservation programs aiming to reduce external P loading to surface waters have not resulted in significant water-quality improvements. One factor that can help explain the lack of water-quality response is remobilization of accumulated legacy (historical) P within the terrestrial-aquatic continuum, which can obscure the beneficial impacts of current conservation efforts. We examined how contemporary river P trends (between 1992 and 2012) responded to estimated changes in contemporary agricultural P balances [(fertilizer + manure inputs)-crop uptake and harvest removal] for 143 watersheds in the conterminous United States, while also developing a proxy estimate of legacy P contribution, which refers to anthropogenic P inputs before 1992. We concluded that legacy sources contributed to river export in 49 watersheds because mean contemporary river P export exceeded mean contemporary agricultural P balances. For the other 94 watersheds, agricultural P balances exceeded river P export, and our proxy estimate of legacy P was inconclusive. If legacy contributions occurred in these locations, they were likely small and dwarfed by contemporary P sources. Our continental-scale P mass balance results indicated that improved incentives and strategies are needed to promote the adoption of nutrient-conserving practices and reduce widespread contemporary P surpluses. However, a P surplus reduction is only 1 component of an effective nutrient plan as we found agricultural balances decreased in 91 watersheds with no consistent water-quality improvements, and balances increased in 52 watersheds with no consistent water-quality degradation. |
英文关键词 | legacy phosphorus mass balance eutrophication phosphorus runoff water-quality trend |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489770700049 |
WOS关键词 | ANTHROPOGENIC PHOSPHORUS ; SOIL-PHOSPHORUS ; LAND-USE ; EUTROPHICATION ; NITROGEN ; BUDGETS ; CHALLENGES ; MANAGEMENT ; TRANSPORT ; INPUTS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205191 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.US Geol Survey, Water Mission Area, Denver, CO 80225 USA; 2.US Geol Survey, Water Mission Area, Boulder, CO 80303 USA; 3.US Geol Survey, Water Mission Area, Mounds View, MN 55112 USA |
推荐引用方式 GB/T 7714 | Stackpoole, Sarah M.,Stets, Edward G.,Sprague, Lori A.. Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(41):20562-20567. |
APA | Stackpoole, Sarah M.,Stets, Edward G.,&Sprague, Lori A..(2019).Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(41),20562-20567. |
MLA | Stackpoole, Sarah M.,et al."Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.41(2019):20562-20567. |
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