摘要
土壤酸化是影响植物生长发育的重要因素之一,为探讨石灰用量对降香黄檀Dalbergia odorif-era人工幼林生长及光合特性的影响,在降香黄檀人工幼林造林过程中施加不同量(2.5 kg·植穴-1;5 kg·植穴-1;10 kg·植穴-1)的石灰,分析生长指标和光合生理指标.结果显示,造林后 33 个月,降香黄檀净光合速率、叶面积、苗高、地径均随施加石灰量的增加逐渐上升.在施加石灰量为 10 kg·植穴-1时达到最大值,其净光合速率、叶面积、苗高、地径依次为9.76 μmol·m-2·s-1、19.89 cm2、359.97 cm、5.91 cm,比对照提高了192.20%、77.08%、35.03%、44.02%(P<0.05).研究结果表明,在酸性立地条件下,添加石灰有利于降香黄檀人工幼林的生长,造林早期每植穴添加10 kg石灰较为适宜.
Abstract
Soil acidification is one of the important factors affecting plant growth and development.To ex-plore the effect of lime application on the growth and photosynthetic characteristics of Dalbergia odorifera planta-tion,and provide reference for efficient cultivation of D.odorifera plantations.Different amounts of lime(2.5 kg·planting hole-1,5 kg·planting hole-1,10 kg·planting hole-1)were applied during the afforestation process of D.odorifera plantation.After 33 months,the results showed that the net photosynthetic rate,leaf ar-ea,seedling height,and ground diameter of D.odorifera seedlings increased with the addition of lime up to 10 kg per seedling,where the maximum values.The net photosynthetic rate,leaf area,seedling height,and ground diameter were 9.76 μmol·m-2·s-1,19.89 cm2,359.97 cm and 5.91 cm respectively,which in-creased by 192.20%、77.08%、35.03% and 44.02% compared to the control group(P<0.05).The results indicated that adding lime was beneficial for the growth of young D.odorifera plantation under an acid site,and adding 10 kg of lime per planting hole was more suitable.
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