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DOI | 10.1016/j.scitotenv.2019.05.171 |
Nitrogen transport and retention in a headwater catchment with dense distributions of lowland ponds | |
Zhang, Wangshou1; Li, Hengpeng1; Kendall, Anthony D.2; Hyndman, David W.2; Diao, Yaqin1; Geng, Jianwei1; Pang, Jiaping1 | |
发表日期 | 2019 |
ISSN | 0048-9697 |
EISSN | 1879-1026 |
卷号 | 683页码:37-48 |
英文摘要 | The existence of lowland ponds alter watershed nitrogen (N) cycles via combined changes in runoff and N processing potential, which can significantly buffer watershed N transport. Here, we adopt the conceptual framework of the SPAtially Referenced Regressions On Watershed attributes (SPARROW) model to describe N transport and explore the buffering roles of lowland ponds in a small headwater watershed of Taihu Lake Basin, China. Our model, which included variables for nutrient sources, riverine length, precipitation and pond density, explained 95% of the spatio-temporal variability in total N loads. Results indicated that the northern parts of this watershed were hotspot regions, which contributed relatively large N yields. While their contributions have high temporal variations, they depend upon local precipitation rates. The model results also revealed important processes of landscape N retention. On average, approximately 87% of terrestrial N inputs were removed via denitrification, plant uptake, and other processes or retained in the subsurface during land-to-water delivery. This amount can be further differentiated into 12% retained by lowland ponds and the remaining 75% associated with other landscapes including nutrient storage in soils and groundwater, as a legacy of historical inputs. By contrast, in-stream retention processes only removed 3% of the total terrestrial N inputs. In the future, riverine N pollution will likely be exacerbated by releases from legacy storage and intensified human activities, especially as climate change is expected to enhance extreme rainfall conditions. An integrated N management strategy that appropriately considers the buffering roles of lowland ponds and other landscapes, is required to optimize N fertilizer inputs and protect precious headwater resources. (C) 2019 Elsevier B.V. All rights reserved. |
WOS研究方向 | Environmental Sciences & Ecology |
来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/102941 |
作者单位 | 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China; 2.Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA |
推荐引用方式 GB/T 7714 | Zhang, Wangshou,Li, Hengpeng,Kendall, Anthony D.,et al. Nitrogen transport and retention in a headwater catchment with dense distributions of lowland ponds[J],2019,683:37-48. |
APA | Zhang, Wangshou.,Li, Hengpeng.,Kendall, Anthony D..,Hyndman, David W..,Diao, Yaqin.,...&Pang, Jiaping.(2019).Nitrogen transport and retention in a headwater catchment with dense distributions of lowland ponds.SCIENCE OF THE TOTAL ENVIRONMENT,683,37-48. |
MLA | Zhang, Wangshou,et al."Nitrogen transport and retention in a headwater catchment with dense distributions of lowland ponds".SCIENCE OF THE TOTAL ENVIRONMENT 683(2019):37-48. |
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