Title |
Direct evidence for the enhanced acquisition of phosphorus in the rhizosphere of aquatic plants: A case study on Vallisneria natans
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Published in |
Science of the Total Environment, November 2017
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DOI | 10.1016/j.scitotenv.2017.10.304 |
Pubmed ID | |
Authors |
Xigang Xing, Shiming Ding, Ling Liu, Musong Chen, Wenming Yan, Liping Zhao, Chaosheng Zhang |
Abstract |
There are few studies about the processes and mechanisms for aquatic plants to take up phosphorus (P) in wetland soils and sediments. Direct observation of P mobilization in rhizosphere is lacking. In this study, high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) techniques were used to capture the small-scale changes of soluble reactive P (SRP) and soluble Fe, and labile P in the rhizosphere of Vallisneria natans (V. natans), respectively. The results showed 5.92- and 3.12-fold enrichments of P and Fe in the Fe plaques formed on the root surfaces, respectively, in comparison with the P and Fe concentrations in the non-rhizosphere sediments. Moreover, simultaneous releases of P and Fe appeared in rhizosphere and the SRP concentration showed up to 114-fold increases compared to the non-rhizosphere sediments. Five kinds of low-molecular weight organic acids (LMWOAs) were detected in the root exudates; oxalic acid accounted for 87.5% of the total. Extraction of Fe and P in the Fe plaques was greatly enhanced by root exudates compared to deionized water, and oxalic acid contributed to 67% and 75% of the total extracted Fe and P, respectively. The coupling processes of Fe plaque enrichment of P and oxalic acid complexation of Fe(III) led to significantly enhanced P acquisition in the rhizosphere of V. natans. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 43 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Master | 9 | 21% |
Student > Ph. D. Student | 7 | 16% |
Researcher | 6 | 14% |
Other | 3 | 7% |
Student > Doctoral Student | 1 | 2% |
Other | 4 | 9% |
Unknown | 13 | 30% |
Readers by discipline | Count | As % |
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Agricultural and Biological Sciences | 6 | 14% |
Earth and Planetary Sciences | 2 | 5% |
Business, Management and Accounting | 2 | 5% |
Arts and Humanities | 1 | 2% |
Other | 2 | 5% |
Unknown | 18 | 42% |