期刊
CHEMOSPHERE
卷 293, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.133613
关键词
Soil; Heavy metal; Phosphorus; Microbial communities; Metabolomics
资金
- National Key Research and Develop-ment Program of China [2020YFC1808103]
- Shanghai Municipal Sci-ence and Technology Major Project [2021SHZDZX0100]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07204004, 2017ZX07204002]
This study conducted a potting experiment to promote the colonization of Phragmites in Cd polluted, nutrient deprived, and structurally damaged soil using chemical and microbial modifiers. The co-application of Diversispora versiformis and sodium bentonite significantly improved the soil structure and phosphorus utilization of the plant, while reducing the content of cadmium bound by diethylenetriaminepenta-acetic acid. The results showed increased Phragmites height, tillers, and photosynthetic capacity, along with increased abundance of phosphorus-releasing microbial communities and regulation of phosphorus fixation by the plant.
ABSTR A C T To promote the colonization of Phragmites in Cd polluted, nutrient deprived and structural damaged soil, the combined remediation using chemical and microbial modifiers were carried out in potting experiments. The co-application of Diversispora versiformis and sodium bentonite significantly improved the soil structure and phos-phorus utilization of the plant, while decreasing the content of cadmium bound by diethylenetriaminepenta-acetic acid by 77.72%. As a result, the Phragmites height, tillers, and photosynthetic capacity were increased by 71.60%, 38.37%, and 17.54%, respectively. Further analysis suggested the co-application increased the abun-dance of phosphorus-releasing microbial communities like Pseudomonas sp. and Gemmatimonadetes. Results of rhizosphere metabolites also proved that the signal molecule of lysophosphatidylcholine regulated the phos-phorus fixation and utilization by the plant. This work finds composite modifiers are effective in the colonization of Phragmites in Cd contaminated soil by decreasing the bioavailable Cd, increasing the abundance of functional microbial communities and regulating the phosphorus fixation.
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