摘要
以磁性纳米Fe 3O 4和磷酸盐为主要原料,制备出超顺磁性纳米功能材料[magnetic nano-Fe 3O 4@Ca(H 2PO 4)2 functionalized materials,MFC],利用MFC对镉污染稻田进行大田原位磁选修复后进行水稻栽培试验,研究MFC磁选修复镉污染稻田对水稻不同生育期土壤微生物群落组成和土壤酶活性的影响。结果表明:施加MFC修复镉污染稻田,可有效降低土壤总镉和有效镉含量,投加0.5%和1.0%MFC,土壤总镉分别降低22.14%和24.08%,有效镉分别降低2.29%和12.21%;施加MFC的处理组,3个时期的土壤Shannon指数与Chao1指数均高于该时期对照组,表明提高了水稻生长期土壤细菌群落多样性和丰富度;与对照组相比,抽穗期处理组土壤的Ascomycota丰度占比提升,成熟期处理组土壤的Rozellomycota丰度占比提升,差异有统计学意义(p<0.05),表明提高了水稻拔节期和成熟期土壤真菌群落的多样性和丰富度。同时,提高了水稻生长期土壤脲酶、脱氢酶活性,其中,成熟期Y-0.5%处理组的土壤脲酶活性提升达到55.40%,抽穗期和成熟期Y-0.5%处理组的土壤脱氢酶活性分别提高了44.40%和37.21%,差异有统计学意义(p<0.05),而土壤过氧化氢酶的活性降低。
Magnetic nano-Fe_(3)O_(4)@Ca(H_(2)PO_(4))_(2) functionalized materials(MFC)were prepared by using magnetic nano Fe_(3)O_(4) and phosphate as raw materials.The rice cultivation experiment was conducted after cadmium-contaminated paddy fields remediated in vitro by magnetic separation with MFC.The effects of remediation of cadmium-contaminated paddy fields by MFC magnetic separation on soil microbial community composition and soil enzyme activity of cadmium-contaminated paddy field were studied.The results showed that the application of MFC to repair cadmium-contaminated paddy fields could significantly reduce the total Cd and available Cd contents in soil.Addition of 0.5%and 1.0%MFC reduced soil total Cd by 22.14%and 24.08%,and available Cd by 2.29%and 12.21%,respectively.The MFC treatment groups showed higher soil Shannon index and Chao1 index than the control group at all three stages of rice growth,indicating an increase in soil bacterial community diversity and richness during the rice growth period.Compared with the control group,in the soil of treatment group,the Ascomycota abundance increased in the heading stage,and the Rozellomycota abundance increased significantly in the mature stage(p<0.05),indicating an increase in the diversity and richness of soil fungal communities during rice booting and maturing stages.At the same time,the activities of urease and dehydrogenase in the soil during the growth period of rice were increased.Among them,the Y-0.5%treatment group showed a 55.40%increase in soil urease activity in the mature stage,while the Y-0.5%treatment group showed a 44.40%and 37.21%increase in soil dehydrogenase activity in the heading stage and mature stage,respectively,with significant differences(p<0.05),while the activity of soil catalase decreased.
作者
曾微
王强
江湘婷
万灿
张立志
黎洁
ZENG Wei;WANG Qiang;JIANG Xiangting;WAN Can;ZHANG Lizhi;LI Jie(School of Resources and Environment,Southwest University,Chongqing 400715,China;Chongqing Environmental Protection Investment Group Co.,Ltd,Chongqing 401120,China;Housing and Urban Rural Development Bureau of Fucheng District,Mianyang City,Mianyang Sichuan 621000,China;Chongqing BOE Display Technology Co.Ltd,Chongqing 400713,China)
出处
《西南大学学报（自然科学版）》
CAS
北大核心
2025年第2期122-132,共11页
Journal of Southwest University(Natural Science Edition)
基金
国家重点研发计划项目(2017YFD0801004,2017YFD0801005)。
关键词
超顺磁性纳米功能材料
土壤
镉
土壤微生物
土壤酶活性
magnetic nano-Fe_(3)O_(4)@Ca(H_(2)PO_(4))_(2) functionalized materials
soil
cadmium
soil microbiota
soil enzyme activity
