Tolerance mechanism of trees to acid soil and utilization of the mechanism for reforestation of tropical degraded lands

本研究旨在筛选热带酸性土壤中耐环境胁迫的树种，阐明其对过量铝或缺磷等环境胁迫的耐受机制。本研究的目的是利用树木的抗逆性机制，通过改进护理和种植方法，开发退化土地，特别是热带硫酸酸性土壤的环境再造林方法。(1)通过在泰国那拉提瓦的酸性硫酸盐土壤中进行种植试验，选择了一些适合环境再造林的候选树种。(2)所选树种中部分树种对铝毒性或淹水（缺氧）具有耐受性。(3)土堆种植提高了植物的成活率。在泰国那拉提瓦的酸性硫酸盐土壤中的许多树种。

The present study was aimed at screening tolerant tree species for environmental stress in acid soils in tropics and clarifying the tolerant mechanism to such as excess aluminum or phosphate deficiency. The goal of this study is development of the methods for environmental reforestation of degraded lands, especially acid sulfate soil in tropics through the improvement of nursing and plantation methods using the stress-tolerant mechanisms of trees. (1) Some tree species that are the candidate for environmental reforestation were selected by planting trials in acid sulfate soil in Narathiwat, Thailand. (2) Some tree species among the selected tree species have tolerance to aluminum toxicity or flooding (hypoxia). (3) Planting on a mound brought better survival of.many tree species at acid sulfate soil in Narathiwat, Thailand.