文章摘要
生物炭对红壤中铅形态分布的影响
Effects of biochar on species distribution of lead in red soil
  
DOI:
中文关键词: 淹水培养  玉米秸秆炭  花生壳炭  银杉木炭    污染土壤  形态分布
英文关键词: waterlogged incubation  corn straw carbon  peanut shell carbon  silver fir carbon  lead  contaminated soil  species distribution
基金项目:国家自然科学基金资助项目(20577008);湖南省自然科学基金资助项目(05JJ30017)
作者单位
郭素华,邱喜阳,李方文,许丹丹,许中坚 湖南科技大学 化学化工学院湖南 湘潭 411201 
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中文摘要:
      为了探究生物炭对铅污染土壤的修复作用,将玉米秸秆炭(CS)、花生壳炭(PS)和银杉木炭(SF)分别以1%,3%,5%的比例加入铅污染土壤进行淹水培养,在5,15,30和75 d时采样检测铅形态及土壤性质的变化.结果表明:加入生物炭(CS,PS,SF)培养后污染土壤 pH 值较对照分别上升0.43~1.32,0.45~1.01,0.33~0.72个单位值,有机质含量分别增加56.84%~277.89%,14.74%~92.63%,35.79%~128.42%,且都表现为随生物炭施用量的增加而增大.随着培养时间的增长,铅形态分布趋于稳定,酸溶态和可还原态含量下降,残渣态含量上升.添加CS,PS,SF后土壤中酸溶态铅含量与对照相比分别下降19.20%,17.55%,6.66%(平均值).生物炭添加后使铅的生物有效性显著降低,且其降低幅度随生物炭施用量的增加而增大.在生物炭添加量相同的情况下,玉米秸秆炭的修复效果最好.
英文摘要:
      In order to explore repair capacity of biochar application on lead-contaminated soil, the corn straw carbon (CS), peanut shell carbon (PS) and silver fir charcoal (SF) were added in lead contaminated soil in the proportion of 1%, 3%, 5%, respectively. The samples were obtained after waterlogged incubation for 5, 15, 30 and 75 days and then analysed the changes of lead species distribution and soil properties. The results showed that application of biochar significantly increase the pH values and soil organic matter content. Compared with the treatment without biochar, the treatments of adding CS, PS, and SF after cultivation , the pH values of contaminated soils increase 0.43~1.32, 0.45~1.01, 0.33~0.72 units, respectively, while organic matter increased 56.84%~277.89%, 14.74%~92.63%, and 35.79%~128.42%, respectively. Lead species distribution tend to be stable along with the incubation time. Acid soluble form and reducible form contents of lead decrease, whereas residual form contents of lead increase. The acid soluble form contents of lead with the application of CS, PS, SF decrease by 19.20%, 17.55%, 6.66% ,respectively (average). The application of biochar effectively decrease the bioavailability of lead, and its decreasing rate increase gradually as the application of biochar rate. With the same amount of biochar addition, the remediation effect of corn straw carbon is the best.
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