Saturday, 15 July 2006

The relationship between soil conditions and declining growth rate of famous aged Pinus tabulaeformis at Jietai temple in Beijing China.

Lishui Nie, Michigan State University, 4632 S. Hagadorn C-16, East Lansing, MI 48823

The relationship between soil conditions and the low growth rate of famous aged Pinus tabulaeformis in Jietai temple was studied. Results showed that these famous aged pine trees grow on soils with low organic matter, total nitrogen and readily available phosphorus but with enough available potassium, iron, copper and zinc. A suitable total soil porosity but with relatively high capillary porosity and very low non-capillary porosity of 1.1%-6.4% was found for tree growth. High soil moisture in topsoil (25 w/w %) along with a very low permeability may lead to oxygen shortage in the roots. Soil pH was higher than 8 in all layers. In topsoil, water-soluble sodium was higher than 100 mg/kg soil which may be toxic to the pine trees, and easily reducible materials was higher than 1.5% which may put the roots in a reduction condition. Suggestion was made to scientifically monitor the habit of the famous old pine trees and to investigate soil chemical and physical properties, soil moisture, mechanical harm and environmental pollutants so as to control them under the permissible standards. Key words famous aged Pinus tabulaeformis soil conditions soil chemical properties soil physical properties

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