水土保持研究2024，Vol.31Issue(1)：117-125,9.DOI:10.13869/j.cnki.rswc.2024.01.020
笋溪河面源污染及其与河岸带土壤有机碳、氮、磷的关系
Nonpoint Source Pollution and Its Relationship with Soil Organic Carbon,Nitrogen and Phosphorus of the Riparian Zone in the Sunxi River Watershed
摘要
Abstract
[Objective]The aim of this study is to analyze the spatial heterogeneity of nitrogen and phosphorus in water body and riparian soil,and to explore the effects of soil organic carbon,nitrogen and phosphorus content on nonpoint source pollution so as to provide a theoretical basis for clarifying the water nonpoint source pollution status and its relationship with the riparian soil of the Sunxi River watershed in Chongqing.[Methods]44 water samples along the Sunxi River and soil samples at depths of 0-20 cm and 20-40 cm in the riparian zone were collected.We applied the Nemerow index to evaluate water pollution status.The ANOVA and multiple comparison,independent sample t-test,correlation analysis and redundancy analysis were used to study the spatial distribution characteristics of nitrogen and phosphorus forms in water body,soil organic carbon,total and available nitrogen and phosphorus in the riparian zone,and the response of water nitrogen and phosphorus to soil organic carbon,nitrogen,phosphorus forms and their stoichiometric ratios.[Results](1)The Sunxi River was seriously polluted,and the pollution in the lower reach was more serious than that in the upper and middle reaches.(2)Water total nitrogen,total phosphorus and soluble phosphate in the lower reach of the Sunxi River watershed were extremely significantly higher than those in the upper and middle reach,nitrate nitrogen in the lower reach were extremely significantly higher than that in the middle reach(p＜0.01).(3)Soil organic carbon contents at the depth of 20-40 cm in the lower rea-ches were significantly higher than the middle reach,available phosphorus in the two soil layers and total phosphorus at 20-40 cm were significantly different among the river sections,while soil C/P ratios at 20-40 cm and N/P ratios at 0-40 cm were significantly higher in the upper reach than the middle and lower reaches(p＜0.05).The contents of soil organic carbon,total nitrogen,nitrate nitrogen,total and available phosphate at the depth of 0-20 cm were significantly higher than those at 20-40 cm(p＜0.05)with an obvious surface accumulation phenomenon.(4)Correlation analysis indicated that water nitrogen forms and total phosphorus were significantly positively correlated with soil total and available phosphorus(p＜0.05),and redundancy analysis showed that the total interpretation rate of soil organic carbon,nitrogen,phosphorus forms and stoichiometric ratios to water nitrogen and phosphorus forms was 64.15％,indicating that soil total and available phosphorus were the main factors affecting nonpoint source pollution.[Conclusion]The nonpoint source pollution of the Sunxi River is severe,and soil total and available phosphorus can significantly affect the water pollution status.The control of nonpoint source pollution should focus on the riparian ecosystem.关键词
笋溪河流域/面源污染/河岸带/化学计量比Key words
Sunxi River watershed/nonpoint source pollution/riparian zone/stoichiometric ratio分类
资源环境引用本文复制引用
侯文宁,王海燕,孟海,宁一泓,赵晗,崔雪..笋溪河面源污染及其与河岸带土壤有机碳、氮、磷的关系[J].水土保持研究,2024,31(1):117-125,9.基金项目
国家"十三五"重点研发计划"三峡库区面源污染景观生态防治技术集成与示范"(2017YFC0505306) （2017YFC0505306）
