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New Insight into Phosphorus Release of Rhizosphere Soil in the Water Level Fluctuation Zone

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  • Zichao Tang

    (Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
    College of Environment and Ecology, Chongqing University, Chongqing 400045, China)

  • Yanxue Jiang

    (Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
    College of Environment and Ecology, Chongqing University, Chongqing 400045, China)

  • Chenchen Wang

    (Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
    College of Environment and Ecology, Chongqing University, Chongqing 400045, China)

  • Rui Zhang

    (Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
    College of Environment and Ecology, Chongqing University, Chongqing 400045, China)

  • Jinsong Guo

    (Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
    College of Environment and Ecology, Chongqing University, Chongqing 400045, China)

  • Fang Fang

    (Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
    College of Environment and Ecology, Chongqing University, Chongqing 400045, China)

Abstract

Many phosphorus release experiments have been conducted in the water level fluctuation zone (WLFZ). However, the effects of rhizospheres on the risk of soil phosphorus release remain unclear. In this study, twenty-four soil samples were collected from the WLFZ of the Pengxi River, the largest tributary of the northern Three Gorges Reservoir. Physicochemical properties, phosphorus forms and phosphatase activity in rhizosphere and near-rhizosphere soils were investigated. Both the total phosphorus (TP) and water-extracted organic phosphorus (H 2 O-P o ) contents were significantly higher in rhizosphere soils than in near-rhizosphere soils ( p < 0.05). Enrichment rates (ER) of TP and H 2 O-P o were 42.4% and 180.3%, respectively. Significant increases were also found in activities of acid phosphatase, alkaline phosphatase, and phosphodiesterase in the rhizosphere, and corresponding ERs were 95.3%, 76.1%, and 22.0%, respectively. Environmental factors, such as pH, organic matter, and amorphous manganese, made significant contributions to the variations of phosphorus forms and phosphatase activities. The risk of phosphorus release to water in the rhizosphere soils of the study area increased slightly, according to the water-extracted phosphorus index. This risk may further increase due to flooding, as plant uptake of soil phosphorus would be inhibited while inorganic phosphorus is still generated by phosphatase.

Suggested Citation

  • Zichao Tang & Yanxue Jiang & Chenchen Wang & Rui Zhang & Jinsong Guo & Fang Fang, 2023. "New Insight into Phosphorus Release of Rhizosphere Soil in the Water Level Fluctuation Zone," Sustainability, MDPI, vol. 15(8), pages 1-16, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:8:p:6635-:d:1123168
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    References listed on IDEAS

    as
    1. Naoki Yamaji & Yuma Takemoto & Takaaki Miyaji & Namiki Mitani-Ueno & Kaoru T. Yoshida & Jian Feng Ma, 2017. "Erratum: Reducing phosphorus accumulation in rice grains with an impaired transporter in the node," Nature, Nature, vol. 543(7643), pages 136-136, March.
    2. Naoki Yamaji & Yuma Takemoto & Takaaki Miyaji & Namiki Mitani-Ueno & Kaoru T. Yoshida & Jian Feng Ma, 2017. "Reducing phosphorus accumulation in rice grains with an impaired transporter in the node," Nature, Nature, vol. 541(7635), pages 92-95, January.
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