| 摘要 |
In the past, it was said that in planted forests such as those of Japanese cedar, hinoki, etc., forest function would be restored if illumination intensity in the forest is secured by reducing the density of standing trees by forest maintenance work such as periodic thinning, pruning, etc. However, because the time that the interior of overplanted forests has been maintained with a low illumination intensity is long, soil acidification is advanced and the number of areas where vegetation has not recovered is increasing. Moreover, in areas where soil pH has decreased significantly and which have become strongly acidic due to being special kinds of soils such as acid sulfate soils, improvement of the soil environment cannot be anticipated if left alone as such. The invention is configured so that a soil dressing (2) obtained by mixing steel converter slag (3) and an organic material (4) to which an add-in material (7) obtained from plant seeds (8) and/or fertilizer (9) and binder (10) is added, is used as an acidity-mitigating base material (1) and said acidity-mitigating base material (1) is supplied to a target ground (G) where the soil pH has decreased and which has become a strongly acidic soil. |
