Silicon Amendment Reduces Soil Cd Availability and Cd Uptake of Two Pennisetum Species

Qiyu Dong, Jianbo Fang, Fei Huang and Kunzheng Cai
Additional contact information
Qiyu Dong: Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Jianbo Fang: College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China
Fei Huang: Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Kunzheng Cai: Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China

IJERPH, 2019, vol. 16, issue 9, 1-13

Abstract: Silicon (Si) plays important roles in alleviating heavy metal stress, but the migrating effects and mechanisms, especially for Pennisetum , are not well studied. In this study, Pennisetum glaucum and Pennisetum glaucum × P. purpureum were used to explore the impacts of Si application on alleviating cadmium (Cd) toxicity and its possible mechanism. Treatments consist of four levels of Cd (0, 10, 50, and 100 mg·kg −1 ) with or without 2.0 mM Si amendments. Under Cd stress, Si application significantly increased plant biomass and Si content, reduced Cd content, and decreased the enrichment factor in shoots and roots. Si treatment also increased soil pH and soil residual Cd, while reducing available/oxidizable/reducible Cd content in soil at 50 and 100 mg·kg −1 Cd levels, thereby leading to a reduction of the soil’s available Cd. These findings indicate that Si application is effective in alleviating Cd phytotoxicity of Pennisetum , mainly through reducing plant Cd uptake and increasing soil pH and Cd immobilization, thereby reducing Cd bioavailability.

Keywords: toxic metal elements; soil; cadmium; silicon; Pennisetum (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/1660-4601/16/9/1624/pdf (application/pdf)
https://www.mdpi.com/1660-4601/16/9/1624/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:16:y:2019:i:9:p:1624-:d:229616

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().