干旱胁迫下保水剂对桉树幼苗生长的影响

Influence of Water-retaining Agent on the Growth of Eucalyptus Seedlings under Drought Stress

[目的]为华南地区桉树造林正确使用保水剂提供理论依据。[方法]以华南赤红壤为栽培基质,采用盆栽法,研究干旱胁迫条件下不同用量的保水剂对桉树幼苗生长的影响。[结果]干旱胁迫条件下,保水剂可有效减小栽培基质的脱水速度,且保水剂用量越大,栽培基质的脱水速度越慢;保水剂可明显提高桉树苗木的成活率,延长桉树苗木的成活时间;保水剂用量增大明显对桉树苗木的生长有利,桉树苗木的株高明显增大;保水剂可有效延长桉树苗木的生长期。[结论]干旱胁迫条件下,保水剂可有效提高华南赤红壤的储水能力和桉树苗木的成活率,延长其存活时间和生长期。

[Objective] The aim was to provide theoretical basis for using water-retaining agent correctly in eucalyptus forestation in south China. [Method] In pot test, with lateritie red soll in south China as cultivation substrate, the influences of water-retaining agent at different dosages on the growth of eucalyptus seedlings under drought stress were studied. [Result] Under drought stress, the water-retaining agent could reduce the dewatering velocity of cultivation substrate effectively and the bigger the dosage of water-retaining agent was, the slower the dewatering velocity of cultivation substrate was; it could significantly increase the survival rate of eucalyptus seedlings and extend their survival time, when its dosage increased it was significantly favorable for the growth of eucalyptus seedlings, whose plant heights increased significantly; it could effectively extend the growth period of eucalyptus seedlings. [Conclusion] Under drought stress, the water-retaining agent could increase the water-storing capacity of lateritic red soil in south China and the survival rate of eucalyptus seedlings effectively and extend their survival time and growth period.