1. Straw removal reduces Cd availability and rice Cd accumulation in Cd-contaminated paddy soil: Cd fraction, soil microorganism structure and porewater DOC and Cd.
- Author
-
Zhou H, Wang ZY, Li C, Yuan HW, Hu L, Zeng P, Yang WT, Liao BH, and Gu JF
- Subjects
- Soil chemistry, Plant Roots metabolism, Plant Roots microbiology, Rhizosphere, Agriculture, Bacteria metabolism, Hydrogen-Ion Concentration, Microbiota, Oryza metabolism, Cadmium metabolism, Cadmium analysis, Soil Pollutants metabolism, Soil Microbiology
- Abstract
The impacts of straw removal on rice Cd absorption, behaviour of Cd and microbial community in rhizosphere soil were investigated in paddy fields over two consecutive seasons. The results of the experiments in two fields revealed that straw removal promoted the transformation of soil Cd from acid-extractable and oxidisable fraction to residual fraction and reduced soil DTPA-Cd content with the reduction in DOC and Cd ions in soil porewater, thereby decreasing Cd content in rice. Specifically, the Cd content in brown rice was below 0.2 mg·kg
-1 when all rice straw and roots were removed in the slightly Cd-contaminated soils. The α-diversity of soil microbial communities was less influenced by continuous straw removal, β-diversity was altered and the relative abundances of Anaeromyxobacter, Methylocystis and Mycobacterium microbes were increased. Redundancy analysis and network analysis exhibited that soil pH predominantly influenced the microbial community. Path analysis revealed that the Cd content in brown rice could be directly influenced by the soil Total-Cd and DTPA-Cd, as well as soil pH and OM. Straw removal, including roots removal, is an economical and effective technique to reduce Cd accumulation in rice plants., Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Jiao-Feng Gu reports financial support was provided by Department of Science and Technology of Hunan Province. Jiao-Feng Gu reports financial support was provided by Department of Science and Technology of Changsha City. Hang Zhou reports financial support was provided by Department of Science and Technology of Hunan Province. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)- Published
- 2024
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