Chloride removal capacity and salinity tolerance in wetland plants

编号 030035303

推送时间 20220725

研究领域 森林经理 

年份 2022 

类型 期刊 

语种 英语

标题 Chloride removal capacity and salinity tolerance in wetland plants

来源期刊 JOURNAL OF ENVIRONMENTAL MANAGEMENT

期 第353期

发表时间 20220115

关键词 Phytodesalination;  Wetland plants;  ChloridePolluted waters;  Carex riparia;  Phalaris arundinacea; 

摘要 Deicing with sodium chloride maintains safe roads in the winter, but results in stormwater runoff with high chloride (Cl-) content that causes various downstream problems. Chloride-rich water risks contaminating groundwater, shortening the lifespan of concrete and metal constructions, and being toxic to aquatic organisms. Current stormwater treatment methods are unable to remove Cl-, but wetland plants with high chloride uptake capacity have potential to decrease Cl- concentrations in water. The aim was to identify suitable plant species for removing Cl- from water for future studies on phytodesalination of water, by comparing 34 wetland plant species native to Sweden in a short-term screening. Additionally, Carex pseudocyperus, C. riparia, and Phalaris arundinacea was further compared as to their salinity tolerance and tissue Cl- concentration properties. Results show that Cl- removal capacity, tissue accumulation, and tolerance varied between the investigated species. Removal capacity correlated with biomass, dry:fresh biomass ratio, water uptake, and transpiration. The three tested species tolerated Cl- levels of up to 50-350 mg Cl- L-1 and accumulated up to 10 mg Cl- g(-1) biomass. Carex riparia was the most Cl(-)tolerant species, able to maintain growth and transpiration at 500 mg Cl- L-1 during 4 weeks of exposure and with a medium removal capacity. Due to a large shoot:plant biomass ratio and high transpiration, C. riparia also had high shoot accumulation of Cl-, which may facilitate harvesting. Phalaris arundinacea had the highest removal capacity of the investigated species, but displayed decreased growth above 50 mg Cl- L-1. From this study we estimate that wetland plants can remove up to 7 kg Cl- m(-2) from water if grown hydroponically, and conclude that C. riparia and P. arundinacea, which have high tolerance, large biomass, and high accumulation, are suitable candidates for further phytodesalination studies.

服务人员 付贺龙

服务院士 唐守正

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