| To counter some problems of forest ecosystem in Beijing mountain areas, such as irrational structure, low stability and service function, learning from the new ideology of forest health and putting management of forest ecosystem in effect are trials for achieving the goal of sound ecological circulation in forest development. Soil is a fountain of tree growth, and plays an important role in the sustainable forest health management. Soil physico-chemical properties and health indices under different forest classification were studied through combining methods of investigations and experiments, comparing with unique and comprehensive analysis of soil properties in Badaling mountain, Beijing. This paper will provide a theoretical and technical basis for the management of forest soil health and plantations. It is in favor of establishing the assessment indicators of mountain forest health in North China as well.The main results were as follows:①Among 79 plots, the percentage of A/B/C configuration was 80%. The average depth of forest floor was 2.57cm, and the percentage of 1-2cm was 44%. The mean depth of humus layer was 4.44cm, 94% of which belonging to thin level. The mean depth of soil layer (A+B) was 30.91cm, with 46% belonging to thin, and 54% belonging to thick class. Relationship between organic matter and melanization was firstly studied in forest soil. The result was that with the decreasing of the value, the content of organic matter was increasing.②Effect of forest on soil physical properties was obviously. The physical indicators under pure needle–leaved forest, for example Larix principis-rupprechtii and Pinus tabulaeformis, were not better than those under secondary forest and mixed plantations. Broad-leaved forest was in favor of soil physical properties.③In soil cation exchangeable capacity(CEC), Ca2+ was up to about from 76.37% to 86.81%, the sum of K+ and Na+ was from 1.41% to 3.87%, and the content of exchangeable H+ was...
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