生态环境学报Issue(6)：1057-1063,7.
生物炭施用对矿区污染农田土壤上油菜生长和重金属富集的影响
Effects of biochar application on growth and typical metal accumulation of rape in mining contaminated soil
摘要
Abstract
Minging activity can often cause pollution of farmland, and so it has important practical implications to use biochar technology to manage the contaminated soil in the surrounding farmland of mine. Biochar is a fine-grained, porous and environment-friendly material obtained from the pyrolysis of biomass under anaerobic or oxygen-limited conditions, and showing potential applications in improving soil quality, promoting plant growth, reducing greenhouse gas emissions and regulating pollutant behaviors. A pot experiment was carried out to study the effects of rice straw biochar with different application rate (0, 1%and 5%) on the soil biochemical traits, growth, typical heavy metals uptake and accumulation coefficients of rape (Brassia campestris L.) in two heavy metals contaminated soils which were from the farmland near mining area in Chenzhou and Longyan city. The results of this study will provide scientific basis for the management of contaminated soil in the surrounding farmland of mine. The results showed that biochar addition increased soil pH and organic matter, especially in acidic Longyan soil. The soil enzyme changed after biochar addition, the activity of urease and catalase significantly increased after 5% biochar addition, but the alkali phosphatase activities decreased. In Chenzhou soil, compared to the control treatment, the biomass of rape significantly decreased only under the treatment of 5%biochar addition. In Longyan soil, the biomass significantly increased after both 1%and 5%biochar addition. The concentrations of Cd, As and Pb in edible rape changed after biochar addition in two tested soils, but there was no consistent patterns. Compared to the control treatment, Cd concentration in edible rape decreased, but there was a significant difference only under the treatment of 5%biochar-amended Longyan soil. As for Pb concentrations, 1%and 5%biochar addition could significantly decreased its concentrations in edible rape , with different decreasing ranges of 23.6%and 22.0%in Chenzhou soil and 82.1%and 94.5%in acidic Longyan soil. As concentrations in edible rape differed in two tested soils amended with biochar. As concentrations in edible rape grown in biochar-amended Chenzhou soil increased with the increasing application rate of biochar, while it was contrary to Longyan soil, with As concentrations in edible rape decreasing by 50%and 68.9%after biochar additon, respectively. The related biological and chemical mechanisms remains further to be investigated. Compared with the control, the accumulation coefficients of Pb and Cd in edible rape part was decreased in both tested soils, however, the accumulation coefficient of As was increased in Chenzhou soil, but decreased in Longyan soil. In practice, biochar can be an alternative improver for mining contaminated soil remediation, but the investigation should be done in optimizing application condition.关键词
生物炭/油菜/重金属/矿区/土壤Key words
biochar/rape/heavy metal/mining area/soil分类
资源环境引用本文复制引用
侯艳伟,池海峰,毕丽君..生物炭施用对矿区污染农田土壤上油菜生长和重金属富集的影响[J].生态环境学报,2014,(6):1057-1063,7.基金项目
福建省自然科学基金项目（2012J01177）；福建省自然科学基金项目（2014J01049）；中央高校基本科研业务费专项资金 （）
