[Temporal and spatial change characteristics of soil elements in reclaimed slope forestland]

Calcium, Magnesium, Copper, Zinc, Manganese and Iron are necessary elements for plant growth and important indicators for soil quality evaluation. After forestland being reclaimed, spatial distributions of soil elements would be affected by plowing, erosion-deposition-transportation, and soil element properties. In the initial stage of forestland being reclaimed (the first and second year), Cu, Zn, Mn, Fe, K, Ca, and Mg in different slope locations would be increased. After two years, these elements would be decreased because of soil erosion. After six years, Cu, Fe, K, and Mg would be decreased by 1.5-4.56%. SiO2 content on the upper slope would be increased as reclaimed year increased, but on the middle slope, SiO2 content would be decreased and Al element would be increased.