Distribution Changes of Phosphorus in Soil–Plant Systems of Larch Plantations across the Chronosequence

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Artikel aus einer Zeitschrift

200206096

Abstract: Phosphorus (P) is one of the most important factors influencing the growth and quality
of larch plantations. A systematic knowledge of the dynamic changes of P in soil–plant systems
can provide a theoretical basis for the sustainable development of larch plantations. We determined
the concentration, biomass, and accumulation of P in five tree components (i.e., leaf, branch, bark,
stem, and root), and the concentrations of various soil P fractions of larch plantations in 10-, 25-,
and 50-year-old stands in northeast China. Our results showed that the N:P ratio and P concentration
in leaves increased with stand age, indicating that the growth of larch plantations might be limited
by P in the development of stands. The N:P ratio and P concentration in roots, and P resorption
efficiency, increased with stand age, indicating the use efficiency of P could be enhanced in older
stands. The concentrations of soil-labile P fractions (Resin-P, NaHCO3-Pi, and NaHCO3-Po) in 25-
and 50-year-old stands were significantly lower than those in 10-year-old stands, indicating the
availability of soil P decreases with the development of larch plantations

Keywords: leaf N:P ratio; P resorption efficiency; soil P fractions; P stock; stand age