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环境胁迫耐受树种，阐明耐铝缺磷树种的耐性机制。本研究的目的是利用树木的耐逆机制，通过改进抚育和种植方法，发展退化土地，特别是热带酸性硫酸盐土壤的环境再造林方法。(1)通过在泰国那拉提瓦酸性硫酸盐土壤上的种植试验，选出了一些环境更新的候选树种。(2)所选树种中的部分树种对铝毒或淹水(缺氧)具有耐受性。(3)在泰国那拉提瓦的酸性硫酸盐土壤上种植能使许多树种获得较好的成活。

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.