土壤水分含量和接种摩西斗管囊霉(Funneliformis mosseae)对伯乐树幼苗生长的影响

Effect of soil water content and inoculation with Funneliformis mosseae on growth of Bretschneidera sinensis seedlings

该研究测定了伯乐树在不同水分处理(40%、60%、80%、100%)和时间节点下的菌根侵染率,不同水分处理前后接种组和对照组幼苗株高、地径、叶片数等形态指标以及叶片丙二醛含量、幼苗成活率指标。结果表明:(1)相对含水量60%条件下,菌丝、丛枝和总的侵染率最高,40%低水分含量和80%以上高水分含量都不利于菌根真菌对幼苗的侵染。(2)在40%和60%低水分量含量条件下,接种幼苗的丙二醛含量显著低于对照,接种摩西斗管囊霉可提高幼苗对干旱胁迫的抗耐性,但80%和100%高水分含量条件下接种对幼苗的作用不明显。(3)幼苗在自然和接种条件下适宜生长的土壤相对含水量为80%和60%。(4)相同水分条件下,接种幼苗成活率高于对照,其中相对含水量60%下接种幼苗的成活率最高(90%),在40%低水分含量或100%饱和水分含量下,幼苗的成活率都相对较低。

In this paper, the mycorrhizal infection rates of Bretschneidera sinensis under different water treatments (40%, 60%, 80%,100%) and time points were determined.Quantified morphological characteristics of the seedlings such as height, ground diameter, and number of leaves, together with malonaldehyde content and survival rate in the inoculation group and the control group before and after different water treatments were also determined.The results were as follows:(1) Under the condition of relative soil moisture content of 60%, the infection rates of mycelium, arbuscula and the total were the highest, low moisture content (40%) and high moisture content (≥80%) were not conducive to mycorrhizal fungi on the seedlings infestation.(2) The content of malondialdehyde in the inoculated seedlings was significantly lower than that of the control at 40% and 60% treatments, which suggested that inoculation with Funneliformis mosseae could increase seedling resistance to drought stress, but with no obvious effect on treatments of 80% and 100% high moisture content.(3) The relative water content of soil suitable for seedling growth under natural and inoculated conditions was 80% and 60%, respectively.(4) Under the same water conditions, the survival rate of inoculated seedlings was higher than that of the control, with the highest (90%) under 60% treatment, while the survival rate of seedlings was relatively low at 40% low moisture content and100% saturated moisture content.