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Citation:

Characteristics of Phosphorus Utilization in Families of Toona ciliata var. pubescens

  • Received Date: 2012-03-05
  • Soil culture at 4 phosphorus levels was conducted to illustrate characteristics of phosphorus utilization in 8 families of Toona ciliata var. pubescens with different responses to phosphorus supply. The results indicated that the seedlings were very sensitive to phosphorus supply, and the biomass accumulation of those with minor phosphorus supply were 3-19 times those in natural red soil. At different phosphorus levels, great differences in productivity were found among families. Under low phosphorus stress, the highest ones were 7 times those of the lowest, and under high phosphorus level, the highest ones were 2.6 times those of the lowest. P absorption efficiency was the main reason making differences of dry matter accumulation among families. The dry matter accumulation has a high and positive correlation to height and basal diameter of seedlings and root parameters. The root length, root volume, root surface, and the number of fibrous roots were selected as the special characteristics of families that can endure low phosphorus.
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Characteristics of Phosphorus Utilization in Families of Toona ciliata var. pubescens

  • 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China

Abstract: Soil culture at 4 phosphorus levels was conducted to illustrate characteristics of phosphorus utilization in 8 families of Toona ciliata var. pubescens with different responses to phosphorus supply. The results indicated that the seedlings were very sensitive to phosphorus supply, and the biomass accumulation of those with minor phosphorus supply were 3-19 times those in natural red soil. At different phosphorus levels, great differences in productivity were found among families. Under low phosphorus stress, the highest ones were 7 times those of the lowest, and under high phosphorus level, the highest ones were 2.6 times those of the lowest. P absorption efficiency was the main reason making differences of dry matter accumulation among families. The dry matter accumulation has a high and positive correlation to height and basal diameter of seedlings and root parameters. The root length, root volume, root surface, and the number of fibrous roots were selected as the special characteristics of families that can endure low phosphorus.

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