Controlling internal nitrogen and phosphorus loading using Ca-poor soil capping in shallow eutrophic lakes: Long-term effects and mechanisms
文献类型： 外文期刊
作者： Sun, Chuanzhe 1 ; Zhong, Jicheng 1 ; Pan, Gang 2 ; Mortimer, Robert J. G. 2 ; Yu, Juhua 1 ; Wen, Shuailong 1 ; Zhang, Lei 1 ; Yin, Hongbin 1 ; Fan, Chengxin 1 ;
作者机构： 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China
2.York St John Univ, Sch Humanities, York YO31 7EX, England
3.Guangdong Ocean Univ, Sch Chem & Environm Sci, Zhanjiang 524088, Peoples R China
4.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词： Eutrophication; Internal nutrient loading; Capping; Ca-poor clean soil; Sediment-water interface; Shallow lakes
期刊名称：WATER RESEARCH （ 影响因子：12.8； 五年影响因子：13.3 ）
ISSN： 0043-1354
年卷期： 2023 年 233 卷
页码：
收录情况： SCI
摘要： Clean soil is a potential capping material for controlling internal nutrient loading and helping the recovery of macrophytes in eutrophic lakes, but the long-term effects and underlying mechanisms of clean soil capping under in-situ conditions remain poorly understood. In this study, a three-year field capping enclosure experiment combining intact sediment core incubation, in-situ porewater sampling, isotherm adsorption experiments and analysis of sediment nitrogen (N) and phosphorus (P) fractions was conducted to assess the long-term perfor-mance of clean soil capping on internal loading in Lake Taihu. Our results indicate that clean soil has excellent P adsorption and retention capacity as an ecologically safe capping material and can effectively mitigate NH4+-N and SRP (soluble reactive P) fluxes at the sediment-water interface (SWI) and porewater SRP concentration for one year after capping. The mean NH4+-N and SRP fluxes of capping sediment were 34.86 mg m- 2 h-1 and-1.58 mg m- 2 h-1, compared 82.99 mg m- 2 h-1 and 6.29 mg m- 2 h-1 for control sediment. Clean soil controls internal NH4+-N release through cation (mainly Al3+) exchange mechanisms, while for SRP, clean soil can not only react with SRP due to its high Al and Fe content, but also stimulate the migration of active Ca2+ to the capping layer, thus precipitating as Ca-bound P (Ca-P). Clean soil capping also contributed to the restoration of macrophytes during the growing season. However, the effect of controlling internal nutrient loading only lasted for one year under in-situ conditions, after which the sediment properties returned to pre-capping conditions. Our results highlight that clean Ca-poor soil is a promising capping material and further research is needed to extend the longevity of this geoengineering technology.
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