农业环境科学学报2025，Vol.44Issue(8)：2064-2074,11.DOI:10.11654/jaes.2025-0043
九曲河典型农业区域氮磷消纳和负荷空间特征
Spatial characteristics of nitrogen and phosphorus retention and loading in typical agricultural areas of the Jiuqu River basin
摘要
Abstract
In order to explore the spatial characteristics of nitrogen(N)and phosphorus(P)absorption and load in the typical agricultural area of Jiuqu River,this study,based on the systematic sampling and analysis during the period from 2022 to 2023,combined with the water quality response model(NutriShed)of"farmland loss-along-the-way absorption-water body load",comprehensively discussed the spatial distribution of nitrogen and phosphorus loss,absorption and load in the watershed.The results showed that the monthly average total phosphorus(TP)concentration in the main stream of the Jiuqu River ranged from 0.02 to 0.12 mg·L-1,generally maintaining Class Ⅱwater quality standards(0.1 mg·L-1).In contrast,TP concentrations in tributaries fluctuated more widely,ranging from 0.03 to 0.23 mg·L-1,with some periods exceeding Class Ⅲ standards(0.2 mg·L-1),especially during spring and summer when pollution was more severe.The monthly average total nitrogen(TN)concentrations in both the main stream and tributaries exceeded 2.00 mg·L-1.The average TN concentration in tributaries was 20.4％higher than in the main stream,with ammonium nitrogen being the primary nitrogen pollution form.The transition from winter to spring and the summer season were identified as peak periods for nitrogen pollution,with tributaries such as the Nongyan River and Yongsheng River serving as pollution hotspots.Spatially,the highest N and P loads were observed in upstream areas with intensive agricultural activities and densely populated residential zones.Simulations using the NutriShed model further revealed that the annual TN loss in the basin amounted to 404 t,with 147 t attenuated along the way,accounting for 36.4％,and a remaining load of 257 t from 2022 to 2023.The total annual loss of P loss was 57.2 t,with 33.6 t(58.7％)attenuated and a remaining load of 23.6 t from 2022 to 2023.The model analysis highlighted that tributaries with higher N and P concentrations,such as the Nongyan River,are priority areas for targeted remediation.Based on the study results,it is recommended to enhance comprehensive management of non-point source pollution through measures such as optimizing fertilizer application,rationally planning riparian ecological buffer zones,and implementing targeted remediation for highly polluted tributaries.关键词
面源污染/氮磷消纳/氮磷负荷/空间分异/九曲河Key words
non-point source pollution/nitrogen and phosphorus retention/nitrogen and phosphorus load/spatial differentiation/Jiuqu River分类
资源环境引用本文复制引用
苏卫华,王海翔,陈浩,严星,夏永秋,管瑞雪,王慎强,汪玉..九曲河典型农业区域氮磷消纳和负荷空间特征[J].农业环境科学学报,2025,44(8):2064-2074,11.基金项目
江苏省自然科学基金项目(BK20230049) （BK20230049）
长江生态环境保护修复联合研究二期项目(2022-LHYJ-02-0502-05)Natural Science Foundation of Jiangsu Province(BK20230049) （2022-LHYJ-02-0502-05）
Yangtze River Ecological Environment Protection and Restoration Project Ⅱ(2022-LHYJ-02-0502-05) （2022-LHYJ-02-0502-05）
