Utilization of Biochar for the Restoration of Wildfire-damaged Soils

초록

Wildfire-damaged soil is considerably barren, making soil improvement essential for forest restoration. In this study, biochar (BC) was used to restore wildfire-damaged soil, and its efficiency was evaluated through germination and cultivation tests. Rice husk-based BC (RBC) and RBC modified by deep sea water (RBCR and RBCC) were used in this study. The surface areas of RBCR and RBCC were enhanced compared with that of RBC, and modification with deep sea water caused significant changes in the surface area and functional groups. In the germination test, BC treatment improved plant germination and growth by 20 and 45%, respectively, and we found that BC could be utilized as a growth stimulator. Similarly, the kimchi cabbage cultivation test showed that the addition of BC increased both the growth index and yield. These results were attributed to the improvement of the physicochemical properties of wildfire-damaged soil, and we observed that BC treatment contributed to an increase in soil nutrient and water contents. Based on these results, RBCR is considered a suitable material for improving the physicochemical properties of wildfire-damaged soil compared with RBC.

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