CHARACTERIZATION OF RHIZOSPHERE ENVIRONMENT OF <i>LEERSIA HEXANDRA SWARTZ</i> UNDER CONTAMINATION OF Ni AND Cr

TAN Hui; LIN Hua; DING Na; SHI En-ze; GAN Shu-ping

doi:10.13205/j.hjgc.202205016

Volume 40 Issue 5

Jul. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(5): 109-116

TAN Hui, LIN Hua, DING Na, SHI En-ze, GAN Shu-ping. CHARACTERIZATION OF RHIZOSPHERE ENVIRONMENT OF LEERSIA HEXANDRA SWARTZ UNDER CONTAMINATION OF Ni AND Cr[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 109-116. doi: 10.13205/j.hjgc.202205016

Citation:

TAN Hui, LIN Hua, DING Na, SHI En-ze, GAN Shu-ping. CHARACTERIZATION OF RHIZOSPHERE ENVIRONMENT OF LEERSIA HEXANDRA SWARTZ UNDER CONTAMINATION OF Ni AND Cr[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 109-116. doi: 10.13205/j.hjgc.202205016

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CHARACTERIZATION OF RHIZOSPHERE ENVIRONMENT OF LEERSIA HEXANDRA SWARTZ UNDER CONTAMINATION OF Ni AND Cr

doi: 10.13205/j.hjgc.202205016

TAN Hui^1,2,
LIN Hua^{1,2
,
,},
DING Na^1,2,
SHI En-ze^1,2,
GAN Shu-ping^1,2

1. College of Environment Science and Engineering, Guilin University of Technology, Guilin 541004, China;
2. Collaborative Innovation Center for Water pollution Control and Water Safety Guarantee in Karst Area, Guilin 541004, China

Received Date: 2021-11-03
Available Online: 2022-07-02

Abstract

Abstract

To apply Leersia Hexandra Swartz to remediate Ni and Cr complex contaminated soil, root box experiments were used to investigate the changes in the rhizosphere environmental characteristics of Leersia Hexandra Swartz under Ni and Cr composite contamination. The results showed that:the pH of the rhizosphere soil of Leersia Hexandra Swartz was significantly lower(P<0.01) than that of the non-rhizosphere soil and the substrate soil under different concentrations of Ni and Cr; athe urease, acid phosphatase, and acid convertase activities of the inter-rhizosphere soil were significantly higher(P<0.05) than that of the non-rhizosphere soil and the substrate soil. As the concentration of Ni and Cr treatment increased, the pH and soil enzyme activity of Leersia Hexandra Swartz showed different degrees of decrease, and the plant height, biomass, and enrichment coefficient of Leersia Hexandra Swartz were also inhibited. In the correlation analysis, plant height and biomass of Leersia hexandra Swartz showed a significant positive correlation(P<0.01) with soil pH and soil enzyme activity, and soil pH showed the same significant positive correlation(P<0.01) with soil enzyme activity. High-throughput sequencing results showed that the three groups of bacteria with the highest relative abundance in the rhizosphere soil of Leersia Hexandra Swartz were Proteobacteria, Firmicutes and Bacteroidetes; the three genera with the highest relative abundance were Alicyclobacillus, Bordetella and Mucilaginibacter; Hydrotalea may have a facilitating effect on the growth and enrichment capacity of Leersia Hexandra Swartz. The results showed that Leersia Hexandra Swartz could tolerate higher levels of Ni and Cr contamination and that metal-resistant bacteria may be present in its inter-roots, making it a potential plant that can be used for remediation of Ni and Cr complex contaminated soils.
- heavy metal pollution,
- phytoremediation,
- rhizosphere environment,
- soil enzyme activity,
- microbial community

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References(35)

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