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Han-Yuan Chiu , Ching-An Chiu, Jhin-Sian Ke
In the past decades, many vegetable farmlands had been abandoned in Taiwanese mid-mountainous areas. These lands are characterized by drought due to higher than 70% gravel content, and are extremely alkaline due to long-term use of chicken manure and a large amount of lime. In this globally unique degraded land, there is no natural regeneration of any tree species, and traditional reforestation methods are rarely successful. This study aimed to explore the effects of gravel-removed planting and mulching on Alnus formosana seedlings. After 30-month monitoring, both mud planting and mulching could improve the survival rate of seedlings (8.5% for original gravel soil planting, 47.8% for gravel removed soil planting, and 57.8% for gravelremoved mud planting; 46.7% without mulching, 53.3% with peat mulching, and 58.3% with biochar mulching). The results suggested that removing gravel and mulching can increase the water capacity of the field and thus increase the survival of the seedlings. On the other, removing gravel and mulching has no significant difference in the growth of seedlings in diameter and height. Consequently, removing gravel of soil and mulching could promote A. formosana survival in the degraded land, but these measures are not helpful to the initial growth of surviving seedlings.
Conference Presentation, SER2021
Pre-approved for CECs under SER's CERP program