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[Soil P availability in larch rhizosphere].

Y Zhang1, S Bai, Z Wang

  • 1Xishuangbanna Tropical Botanic Garden, Chinese Academy of Sciences, Kunming 650223.

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|January 30, 2002
PubMed
Summary
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Larch roots significantly increase available soil phosphorus (P) in the rhizosphere, altering inorganic P forms. This indicates larch trees effectively mobilize soil phosphorus for uptake.

Area of Science:

  • Soil Science
  • Plant Ecology
  • Biogeochemistry

Background:

  • Phosphorus (P) is a critical nutrient for plant growth.
  • The rhizosphere, the soil zone influenced by plant roots, plays a key role in nutrient cycling.
  • Understanding P dynamics in the larch (Larix gmelini) rhizosphere is essential for forest ecosystem health.

Purpose of the Study:

  • To investigate the effect of larch roots on soil phosphorus (P) concentration and speciation.
  • To analyze variations in available P and inorganic P components in the rhizosphere compared to non-rhizosphere soil.
  • To assess the relationship between soil pH and available P in the larch rhizosphere.

Main Methods:

  • Soil samples were collected from the rhizosphere and non-rhizosphere of larch stands using the exfoliation method.

Related Experiment Videos

  • Total and available phosphorus concentrations were analyzed.
  • Inorganic phosphorus fractions (O-P, Al-P, Fe-P, Ca-P, NH4Cl-P) were determined.
  • Soil pH was measured in both soil types.

    • Main Results:

    • Total P concentrations did not differ significantly between rhizosphere and non-rhizosphere soils.
    • Available P concentration was significantly higher in the larch rhizosphere (12.6% higher in 12-year-old stands, 23.4% higher in 40-year-old stands).
    • Inorganic P composition differed, with lower O-P and higher Al-P, Fe-P, Ca-P, and NH4Cl-P in the rhizosphere. Rhizosphere soil pH was lower but showed no correlation with available P.

    Conclusions:

    • Larch roots effectively mobilize soil phosphorus, leading to increased available P in the rhizosphere.
    • The alteration of inorganic P fractions suggests root exudates influence P transformations.
    • While rhizosphere soil is slightly more acidic, pH is not the primary driver of increased available P in this larch system.