Abstract
Experimental reforestation has been conducted on the steep slope surface with three varied environmental conditions. The initial conditions of the test plots and preliminary results were reported on 13th symposium in 2005. The continuous results of field experiment collected in 2005 were summarized in the present report. The change of water content of surface soil was measured during summer in order to estimate the importance of water status for the survival of planted seedlings. Water content of three experimental plots showed similar tendency in comparison with that observed in each rock surface before planting seedlings. Slight increase of water content of soil surface was observed in the root-beds supporting seedling survival. The nutrient contents of total nitorogen, total carbon, exchangeable cations (Ca, Mg, K, Na) did not show significant difference among test plots. Available phosphate content showed wide variation within and among test plots. The survival rates of planted seedlings did not necessarily coincide with nutrient contents except available phosphate. These results suggested that the water content and available phosphate could be the important factor to decide survival of seedlings. Therefore it is very important to select proper position of planting for the survival of seedlings on the rock surface.
