期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 828, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.154494
关键词
Immobilization; Heavy metal; Mineralization; Soil organic matter; Biochar
资金
- Natural Science Foundation of China [41877031]
This study investigated the effects of biochar amendment on the stabilization of heavy metals and organic matter in polluted soil. The results showed that biochar can simultaneously decrease the availability of Cu and Cd in the soil and inhibit the mineralization of organic matter. Among the different types of biochar, wheat straw biochar had the most significant impact on the mineralization of organic matter.
The simultaneous stabilization of heavy metals and organic matter in polluted soil has received little research attention. In this study, we studied the immobilization of Cu and Cd and the mineralization of organic matter in the acidic soil amended with biochar produced from rice, wheat, corn, and rape straws through incubation experiments. Compared with that in the control treatment, the availability of Cu and Cd in the biochar amended soils decreased by 17-31% and 3-17%, respectively. The cumulative amount of CO2 released from each treatment in 60 days of incubation followed the order: control treatment (399 mg CO2-C kg(-1)) > rape straw biochar treatment (388 mg CO2-C kg(-1)) > rice straw biochar treatment (374 mg CO2-C kg(-1)) > corn straw biochar treatment (355 mg CO2-C kg(-1)) > wheat straw biochar treatment (288 mg CO2-C kg(-1)). The information implied that biochar produced from the straw of common crops can simultaneously stabilize both heavy metals and organic matter in the acidic soil. The transformation of Cu and Cd from acid soluble fraction to residual fraction was the potential mechanism of biochar in facilitating soil heavy metal immobilization. The significant decrease in soil beta-glucosidase activity, which controlled the degradation of soil organic matter, was an important potential pathway of biochar in decreasing soil organic matter mineralization. A significant decrease in the content and a substantial increase in the structural complexity of soil dissolved organic matter could further the decrease of wheat straw biochar in soil organic matter mineralization. Thus, biochar produced from the straw of common crops is a promising amendment for simultaneously stabilizing both heavy metals and organic matter in the acidic soil.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据