摘要
采用盆栽试验,通过设置对照(CK)组、稻壳生物炭(BC)组、水洗BC组和BC水洗液组4个处理,来探究BC中不同组分对水稻富集汞的影响.结果表明:(1)与CK组相比,BC组、水洗BC组和BC水洗液组水稻植株生物量分别增加了 49.14％、24.69％、9.62％;(2)CK组水稻精米中总汞质量浓度为22.90 μg/kg,BC组、水洗BC组和BC水洗液组精米中总汞含量分别降低了66.29％、67.99％、57.34％;(3)与CK组相比,施用BC、水洗BC和BC水洗液可使土壤中溶解与可交换态汞含量分别降低91.20％、85.60％和34.40％;(4)BC、水洗BC、BC水洗液通过增加水稻植株生物量、降低土壤中生物有效态汞含量及孔隙水中总汞含量缓解水稻对汞的富集,BC及水洗BC的效果优于BC水洗液.
Abstract
Pot experiments were conducted to explore the effects of different components in BC on mercury enrichment in rice by setting up four treatments:control(CK)group,rice husk biochar(BC)group,water-washed BC group and BC leachate group.The results showed as follows:(1)Compared with CK group,the rice plant biomass in BC group,water-washed BC group and BC leachate group increased by 49.14％,24.69％and 9.62％,respectively.(2)The total mercury concentration in polished rice in CK group was 22.90 μg/kg,while the total mercury in BC group,water-washed BC group and BC leachate group was decreased by 66.29％,67.99％and 57.34％respectively.(3)Compared with CK group,the contents of dissolved and exchangeable mercury in soil were decreased by 91.20％,85.60％and 34.40％by applying BC,water-washed BC and BC leachate.(4)BC,water-washed BC,and BC leachate alleviated the enrichment of mercury in rice by increasing the biomass of rice plants,reducing the content of bioavailable mercury in soil and the total mercury content in pore water,and the performance of BC and water-washed BC was better than that of BC leachate.
基金项目
国家自然科学基金资助项目(42163008)
贵州省科技计划项目(黔科合基础-ZK[2021]一般218号)
贵州师范大学学术新苗基金项目(黔师新苗[2022]25号)
NETL
NSTL
万方数据