Your browser doesn't support javascript.
loading
Root-mediated acidification, phosphatase activity and the phosphorus-cycling microbial community enhance phosphorus mobilization in the rhizosphere of wetland plants.
Li, Cai; Ma, Xin; Wang, Yan; Sun, Qin; Chen, Musong; Zhang, Chaosheng; Ding, Shiming; Dai, Zhihui.
Afiliação
  • Li C; State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, Nanjing 210008, China.
  • Ma X; School of Hydrology and Water Resources, Hohai University, Nanjing 210098, China.
  • Wang Y; Ministry of Ecology and Environment, Nanjing Institute of Environmental Sciences, Nanjing 210042, China.
  • Sun Q; College of Environment, Hohai University, Nanjing 210098, China.
  • Chen M; State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, Nanjing 210008, China.
  • Zhang C; International Network for Environment and Health, School of Geography and Archaeology, National University of Ireland, Galway, Ireland.
  • Ding S; State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, Nanjing 210008, China. Electronic address: smding@niglas.ac.cn.
  • Dai Z; State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, Institute of Geochemistry, Guiyang 550081, China. Electronic address: daizhihui@mail.gyig.ac.cn.
Water Res ; 255: 121548, 2024 May 15.
Article em En | MEDLINE | ID: mdl-38569357
ABSTRACT
Rhizoremediation of wetland plants is an environmentally friendly strategy for sediment phosphorous (P) removal, the basic underlying principle of which is the complex interactions between roots and microorganisms. This study investigated the immobilization and mobilization mechanisms of P in the rhizosphere of wetland plants using high-resolution spatial visualization techniques and metagenomic sequencing. Two-dimensional visualization of the spatial distribution of P, iron (Fe) and manganese (Mn) indicated that the sequestration of Fe-oxides rather than Mn-oxides caused the depletion of labile P, resulting in an increase in the Fe-adsorbed P fraction. Plants altered the rhizospheric environments and P-cycling microbial community to mobilize low-availability P from sediments. Mineral P solubilization and organic P mineralization were enhanced by local acidification and increased phosphatase activity, respectively. Microbial P mobilization also increased with increasing relative abundances of P solubilization and mineralization genes (gcd and phnW) and decreasing P transportation genes (ugpA, ugpB, and pit) genes in the rhizosphere. These processes led to the remobilization of 10.04 % of inorganic P, and 15.23 % of organic P, in the rhizosphere during the incubation period. However, the resupply of P via the above processes did not compensate for the depletion of rhizospheric P via root uptake and mineral sequestration. Our results provide novel insights into the mechanisms of rhizospheric P cycling, which will help to inform future phytoremediation strategies.
Palavras-chave

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article