On the Pedogenic Process in the Forest areas of the Commemorative Park of EXPO'70

Abstract

Pedogenic processes during about ten years were studied in the forest areas of the Commemorative Park of EXPO'70 Osaka where reclamation and revegetation by native trees were operated.
Results are as follows.(1) Soil properties which have changed significantly are pointed out.(2)(Average Stem Volume)×(Stand Density)^3/2 and its yearly sum have closer relationships to the pedogenic process more than stem volume increment or stem volume per ha.(3) Type of the forest stands (deciduous or evergreen) and its site quality (condition of drainage) have effects to the characteristics cleared by the factor analysis.(4) Average increasing rate of total nitrogen in mineral soils is 3.2 (g/m²/25cm/yr) for the area mounded by the weathered granite (soil), “Masa-soil”, and is 7.9 for the area mounded by the soil of Kansai district's diluvial hills, “Osaka group soil”.