铁改性生物炭促进土壤砷形态转化抑制植物砷吸收

发布时间：2018-01-16 15:08

本文关键词：铁改性生物炭促进土壤砷形态转化抑制植物砷吸收　出处：《农业工程学报》2016年15期 　论文类型：期刊论文

【摘要】：通过盆栽试验研究了不同砷污染水平(10、20、40和80 mg/kg)下,添加不同量(10、20和40 g/kg)改性前后的生物炭对土壤砷形态及植物吸收砷规律的影响。该文以棉花秸秆生物炭及改性生物炭(棉花秸秆生物炭与Fe Cl3?6H2O按质量比为20∶1)为试材,小白菜为供试植物。结果表明:生物炭(10~40 g/kg)和改性生物炭(10 g/kg)能促进小白菜的生长,在添加量分别为20和10 g/kg时生物量最大,其最大值分别为8.26和6.68 g/盆,改性生物炭在添加量为10 g/kg时高于对照组和等量未改性生物炭处理组。在砷质量分数为10和20 mg/kg的基础上,添加生物炭(10~40 g/kg)后,土壤中砷主要以残渣态形式存在;水溶态砷分别增加了0.22%~3.36%和0.96%~3.70%;改性生物炭添加对土壤砷质量分数为10 mg/kg时水溶态砷无明显影响,土壤砷质量分数为20 mg/kg时,添加改性生物炭(10~40 g/kg)后水溶态砷减少了0.12%~0.58%。在高浓度(40和80 mg/kg)砷土壤中,水溶态砷含量随着土壤中砷含量的增加而增大;添加生物炭(10~40 g/kg)后,土壤中水溶态砷分别增加了0.21%~1.56%和2.11%~8.94%,但砷主要以铝形砷形式存在,残渣态砷次之。各处理组小白菜可食部分和根部砷质量分数在添加10~40 g/kg生物炭后的变化规律不尽相同,等量的改性生物炭添加后,可食部分由18.28 mg/kg显著降低至2.66 mg/kg(P0.05),根部从133.99 mg/kg显著降低至20.21 mg/kg(P0.05)。改性生物炭与未改性生物炭相比,改性生物炭能降低土壤中水溶态砷的含量及对小白菜吸收砷有显著的抑制作用。因此,该研究可为改性生物炭在含砷土壤的修复应用中提供数据支撑与理论基础。
[Abstract]:A pot experiment was conducted to study the effects of different arsenic levels on the concentration of 10 mg / kg and 80 mg / kg of arsenic. The effects of 20 and 40 g / kg of biochar on the morphology of arsenic in soil and the regularity of arsenic absorption by plants were studied by using cotton straw biochar and modified biochar (cotton straw biochar and FeCl 3? 6H2O was used as the test material at the mass ratio of 20: 1. The results showed that 10 40 g / kg of biochar and 10 g / kg of modified biochar could promote the growth of pakchoi. The maximum biomass was 8.26 and 6.68 g / basin at 20 and 10 g / kg, respectively. When the amount of modified biochar was 10 g / kg, it was higher than the control group and the same amount of unmodified biochar treatment group, on the basis of arsenic content of 10 and 20 mg/kg. After adding 1040 g 路kg ~ (-1) of biochar, arsenic in the soil was mainly in the form of residuals. Water soluble arsenic increased by 0.22% 3.36% and 0.96% 3.70%, respectively. The addition of modified biochar had no obvious effect on the water-soluble arsenic when the mass fraction of arsenic in soil was 10 mg/kg, but the content of arsenic in soil was 20 mg/kg. The water-soluble arsenic decreased by 0.12% and 0.58 g / kg after adding modified biochar (10g / kg) in high concentration of 40 mg / kg and 80 mg / kg of arsenic. The water soluble arsenic content increased with the increase of arsenic content in soil. The water soluble arsenic in the soil increased by 0.21% and 2.11% respectively after adding 1040 g / kg biochar, but arsenic mainly existed in the form of aluminum arsenic. The content of arsenic in edible part and root of pakchoi was different after adding 1040 g / kg biochar, and the same amount of modified biochar was added. The edible part decreased significantly from 18.28 mg/kg to 2.66 mg / kg P0.05). The root decreased significantly from 133.99 mg/kg to 20.21 mg 路kg ~ (-1) 路kg ~ (-1) P _ (0.05). The modified biochar was compared with the unmodified biochar. Modified biochar can reduce the content of water-soluble arsenic in soil and inhibit the absorption of arsenic in pakchoi significantly. This study can provide data support and theoretical basis for the application of modified biochar in the remediation of arsenic-bearing soils.
【作者单位】：新疆农业大学草业与环境科学学院;新疆农业科学院土壤肥料与农业节水研究所;新疆农业大学水利与土木工程学院;
【基金】：中科院战略先导专项(XDA05050504) 新疆维吾尔自治区研究生科研创新项目资助(XJGRI2015082) 公益性行业(农业)科研专项(201503136) 新疆科技支撑计划项目(201431108)
【分类号】：X53;X173
【正文快照】： 3.新疆农业大学水利与土木工程学院,乌鲁木齐830052)董双快,徐万里,吴福飞,闫翠侠,李典鹏,贾宏涛.铁改性生物炭促进土壤砷形态转化抑制植物砷吸收[J].农业工程学报,2016,32(15):204-212.doi:10.11975/j.issn.1002-6819.2016.15.028 http://www.tcsae.orgDong Shuangkuai,Xu Wa

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