摘要
采用温室盆栽法考察施入不同生物炭对土壤理化性状、土壤养分以及砷化学形态的影响。结果表明:施入不同种类生物炭均可提高土壤pH,同时生物炭还可提高土壤有机质、阳离子交换量(CEC)、有效磷和速效钾含量,改良土壤性能。4种生物炭对pH影响大小依次为KOH改性生物炭(BC_(4))>零价铁改性生物炭(BC_(3))>玉米秸秆生物炭(BC_(1))>HNO_(3)改性生物炭(BC_(2)),BC_(1)对土壤有机质改良效果最好,BC_(4)对土壤CEC的影响最大,4种生物炭对土壤养分的改良效果差别相对较小。生物炭还可降低土壤中砷的生物有效性,土壤砷质量浓度为20、40 mg/kg时,4种生物炭可使可交换态砷质量分数分别下降10.30百分点至11.75百分点、15.31百分点至17.74百分点。综合考虑生物炭改性成本及土壤改良效果,用KOH改性的BC_(4)更适合用于砷污染土壤的修复。
A greenhouse pot culture experiments were carried out to study the effects of different biochars on soil physicochemical property,soil nutrition and heavy metals fractions.The results showed that addition of biochar could increase the soil pH.Furthermore,biochar could also increase the soil organic matter,the content of cation exchange capacity(CEC),available phosphorus and available potassium,and improve the property of the soil.The effect of different biochars on soil pH followed the order of KOH modified biochar(BC_(4))>zero-valent iron modified biochar(BC_(3))>cornstalk biochar(BC_(1))>HNO_(3) modified biochar(BC_(2)),the performance of BC_(1) on improving soil organic matter was best,BC_(4) had the biggest effect on soil CEC,the difference of 4 biochar on improving soil nutrient was relative small.Biochar could also reduce the biological effectiveness of arsenic in soil,when the content of arsenic in soil was 20,40 mg/kg,4 biochar could decrease the mass fraction of exchangeable arsenic by 10.30 percent point to 11.75 percent point,and 15.31 percent point to 17.74 percent point.Comprehensive considering the cost of modification and performance of soil improvement,BC_(4) was more suitable for remediation of arsenic pollution soil.
作者
马茹茹
刘锦卉
史晓凯
李磊
刘利军
向云
MA Ruru;LIU Jinhui;SHI Xiaokai;LI Lei;LIU Lijun;XIANG Yun(Shanxi Key Laboratory of Soil Environment and Nutrient Resources,Taiyuan Shanxi 030006;Shanxi Jinhuan Keyuan Environmental Resource Science and Technology Co.,Ltd.,Taiyuan Shanxi 030024;Shanxi Academy of Environmental Sciences,Taiyuan Shanxi 030027;School of Hydraulic Science and Engineering,Taiyuan University of Technology,Taiyuan Shanxi 030024)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2021年第2期200-205,共6页
Environmental Pollution & Control
基金
山西省自然科学基金资助项目(No.201601D102057)
山西省科技重大专项(No.MH2015-07)
山西省科技重点研发(指南)项目(No.201603D21110-1-5)
山西省土壤环境与养分资源重点实验室开放基金资助项目(No.2016002)。
关键词
砷污染
土壤
生物炭
砷形态
改良效应
arsenic pollution
soil
biochar
arsenic pattern
improvement effect
