Variation and Controlling Factores of the Organic Matter Level in Soils after Conversion of Arable Land into Forest Land in Shandong Province of China

概要

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The selected chemical properties were examined for soils after conversion of arable land into forest land in Shandong Province of China. Soils were collected at three locations, and they were different in the landform (flat land vs slope land), duration of tree growing (20 years vs 10 years), or species of tree (white birch vs apple tree). The pH ranged from 6.4 to 7.1 and the total nitrogen content was in a range of 0.51 to 1.10 g/kg. Their levels varied with the species of tree, and hence the pH and organic nitrogen content of soils were regarded to be controlled by the fertility management. The organic matter content ranged from 11.6 to 28.7 g/kg. It was affected by the landform at the 1% significant level but was insignificantly affected by the duration of tree growing. The organic matter content varied with the human activity. It was significantly higher for the forest land without human activity and grown in the natural condition than for the forest land with human activity such as taking away of fallen leaves by farmers or growing of apple trees subjected to fertility management. Under the human activity, the organic matter content of soil was significantly higher for growing of apple trees than for taking away of fallen leaves.
九州大学の論文