| 徐继敏,张平,廖柏寒,耿勤,李倩,彭佩钦.生物质炭对湘南矿区轻度Pb污染土壤性质及Pb的累积转运影响[J].农业环境科学学报,2018,37(2):259-267. |
| 生物质炭对湘南矿区轻度Pb污染土壤性质及Pb的累积转运影响 |
| Effects of biochar on the properties of soil lightly contaminated with lead in Southern Hunan and bioaccumulation and translocation of lead in rice plants |
| 投稿时间：2017-08-11 修订日期：2017-12-01 |
| DOI：10.11654/jaes.2017-1089 |
| 中文关键词: 土壤 Pb污染 玉米秸秆炭 水稻 富集与转运 |
| 英文关键词: soil lead contamination biochar derived from corn straw rice accumulation and translocation |
| 基金项目:国家重点研发计划项目（2016YFD0800705-02）；农业部与财政部科研专项（农办财函〔2016〕6号）；湖南省教育厅科研项目（15C1408）；湖南省重点学科建设项目（2006180） |
| 作者 | 单位 | E-mail | | 徐继敏 | 中南林业科技大学环境科学与工程学院, 中南林业科技大学稻米品质安全控制湖南省工程实验室, 长沙 410004 | | | 张平 | 中南林业科技大学环境科学与工程学院, 中南林业科技大学稻米品质安全控制湖南省工程实验室, 长沙 410004 | zhyp2008@163.com | | 廖柏寒 | 中南林业科技大学环境科学与工程学院, 中南林业科技大学稻米品质安全控制湖南省工程实验室, 长沙 410004 | | | 耿勤 | 中南林业科技大学环境科学与工程学院, 中南林业科技大学稻米品质安全控制湖南省工程实验室, 长沙 410004 | | | 李倩 | 中南林业科技大学环境科学与工程学院, 中南林业科技大学稻米品质安全控制湖南省工程实验室, 长沙 410004 | | | 彭佩钦 | 中南林业科技大学环境科学与工程学院, 中南林业科技大学稻米品质安全控制湖南省工程实验室, 长沙 410004 | |
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| 中文摘要: |
| 为探讨生物质炭对湘南矿区附近轻度Pb污染土壤的改良效果，通过盆栽试验，研究不同施炭条件（0、0.5%、1.0%、2.0%）对水稻土壤性质及Pb在水稻中的累积转运影响。结果表明：施用玉米秸秆炭能使土壤pH值提高0.50~0.67个单位，有机质增加6.9%~25.1%，CEC升高24.7%~41.3%，土壤Pb的毒性浸出量降低4.4%~25.9%，且Pb的毒性浸出量与有机质、CEC分别呈极显著和显著性负相关；在相同施炭条件下，上述各指标在水稻生长的幼苗期和成熟期时存在差异，土壤pH值和有机质幼苗期高于成熟期，CEC和Pb的毒性浸出量幼苗期低于成熟期。水稻各部位中，根表铁膜对Pb的累积量最多，谷壳对Pb的转运能力最大，施用玉米秸秆炭能增加水稻根表铁膜及谷壳富集Pb的能力，降低水稻根系、茎叶及糙米中Pb含量，当施炭量≥1%时，糙米中Pb含量低于0.2 mg·kg-1，达到国家食品污染物限量标准。研究表明，生物质炭能够有效改良湘南矿区轻度Pb污染土壤，显著降低糙米中Pb的累积。 |
| 英文摘要: |
| The objective of the present study was to investigate the remediation effect of biochar derived from corn straw(BC) at application rates of 0, 0.5%, 1.0%, and 2.0% on the properties of lead-contaminated soil and bioaccumulation and translocation of lead in rice plants by means of a pot experiment. The results showed that application of BC increased soil pH values by 0.50~0.67, soil organic matter(OM) by 6.9%~25.1%, and soil cation exchange capacity(CEC) by 24.7%~41.3% and decreased contents of soil TCLP-extractable Pb by 4.4%~25.9%. The contents of soil TCLP-extractable Pb were found to have significant negative correlations with OM and with soil CEC values. When applying the same amount of BC, there were obvious differences in soil pH values, OM contents, soil CEC values, and contents of soil TCLP-extractable Pb between the rice seedling stage and the mature stage. At the rice seedling stage, soil pH values and OM were relatively higher; whereas at the rice mature stage, soil CEC values and contents of soil TCLP-extractable Pb were relatively higher. Among different rice parts, iron plaques accumulated the most Pb, and husks had the highest Pb-transferring capacity. The experiment indicated that applying BC increased Pb bioaccumulation in iron plaques and husks and decreased Pb contents in rice roots, straw, and brown rice. When the amounts of BC applied were higher than 1%, the Pb contents in brown rice were lower than 0.2 mg·kg-1, which met the safety standard in the National Food Standards(GB 2762-2017). It was obvious that BC could effectively ameliorate light Pb contaminated soil in the Southern Hunan mining area and significantly reduced Pb accumulation in brown rice. |
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