Study on remediation of cadmium contaminated paddy field by ramie (Boehmeria nivea L.) floating island and its supporting technology

Yijia Zhao; Chunming Yu; Ping Chen; Pan Mou; Jikang Chen; Gang Gao; Xiaofei Wang; Aiguo Zhu; Kunmei Chen

doi:10.1016/j.envres.2023.117798

Study on remediation of cadmium contaminated paddy field by ramie (Boehmeria nivea L.) floating island and its supporting technology

Environ Res. 2024 Feb 1:242:117798. doi: 10.1016/j.envres.2023.117798. Epub 2023 Nov 29.

Authors

Yijia Zhao¹, Chunming Yu², Ping Chen³, Pan Mou⁴, Jikang Chen⁵, Gang Gao⁶, Xiaofei Wang⁷, Aiguo Zhu⁸, Kunmei Chen⁹

Affiliations

¹ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: 1102196306@qq.com.
² Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: yuchunming@caas.cn.
³ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: chenping02@caas.cn.
⁴ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: 1214361092@qq.com.
⁵ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: cjk213@126.com.
⁶ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: gaogang@caas.cn.
⁷ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: wangxiaofei@caas.cn.
⁸ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: zhuaiguo@caas.cn.
⁹ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China. Electronic address: chenkunmei@caas.cn.

PMID: 38040175
DOI: 10.1016/j.envres.2023.117798

Abstract

Ramie (Boehmeria nivea L.) is an ideal crop for cadmium (Cd) pollution remediation due to its advantages of both remediating and utilizing, however, it is mainly carried out in dry land, whose restoration effect is relatively slow. Previously, we found that the ramie plants cultivated by hydroponics has several tens of times higher Cd absorption capacity than that planted in soil. However, the issue of how to use hydroponic ramie to remediate Cd contaminated paddy fields needs to be addressed. In this study, we innovatively developed the ramie floating island technology and studied its remediation model on simulated Cd contaminated paddy fields. Different ramie varieties were used to compare the remediation effects, and the results showed that there were differences in adaptability among different varieties on floating islands and the remediation ability of the tested ramie varieties was Z2 > Z1 > Z3. Different harvested times were set to analyze the effects of harvested model on remediation, and it was suggested that multiple harvests can be carried out according to the plant growth status of ramie floating island after 30 days of remediation to achieve better remediation effects. Low water level height (5 cm) of paddy field was beneficial for the accumulation of Cd in the roots, but considering the adaptability of various ramie varieties and the effect of long-term restoration, it was recommended that the water level height of 20 cm for the cultivation of ramie floating island was more suitable. Moreover, we found that low concentration of citric acid (≤2 g L^-1) or polyaspartic acid (≤3 g L^-1) can improve the remediation effects for ramie floating island. Our study opens up a novel approach for ramie to remediate heavy metal pollution and provides a technical reference for water body Cd remediation by plants.

Keywords: Cadmium contaminated paddy field; Floating island technology; Hydroponic ramie (Boehmeria nivea L.); Phytoremediation; Remediation model.

MeSH terms

Boehmeria*
Cadmium
Environmental Restoration and Remediation*
Metals, Heavy*
Soil Pollutants*
Water

Substances

Cadmium
Metals, Heavy
Water
Soil Pollutants