锰过量对发财树生长的影响初报

Effect of Excess Manganese on the Growth of Pachira aquatica Aublet

探讨发财树植株黄化的原因及发生机制。结果表明:当土壤中的有效锰含量超过230 mg/kg时,对发财树产生毒害,此时,在黄化植株的根、叶部位锰元素含量,分别比正常植株高1倍和2倍以上;锰的过量吸收,影响根系对其它一些元素的吸收;土壤中的酸度过低及一些元素的不足,是造成有效锰含量过高的原因。因此,提高土壤pH值、改进耕作方法、增加土壤的钙、镁、铁等元素的有效含量,可降低锰害发生。

We explored the reason of etiolation in Pachira aquatica Auhlet. When the content of effective manganese exceeded 230 mg/kg, the plants were poisoned. In the roots and leaves of etiolated plants, the content of manganese was one and two times more than the healthy plant, respectively. The excessive absorption of manganese influenced the roots to absorb other contents. The low pH value and insufficient contents caused the effective manganese excessive. As a result, to decrease the damage of manganese, we can improve the pH value, working technique and the effective contents such as calcium, magnesium and iron.