The Impact Of Soil Drought On The Mycorrhizal Inoculation Effect Of Populus Tomentosa

Approaches of experimental ecology and physiology were used to research on effects of mycorrihizal inoculation on populus tomentosa under serious stress of soil moisture (7.4%-7.96%). The results showed that incentive effect of mycorrhizal inoculation on drought resistance of p. tomentosa was strongly constrained by serious soil drought, which was strengthened by proper fertilizing.Environment factors had a great effect on morphological characters of Ectomycorrhiza. Ectomycorrhizal formed by Sclerodema sp. showed differential morphological charactes under different environment, that it was simplifed, no branching and witches 'broom. Under soil serious soil drought, treatment of proper fertilizing promoted obviously growth of root ,stem and leaf of the host cuttings inoculated , but treatment of no fertilizing or more fertilizing had no the effect. Photosynthetic rate of the host cuttings inoculated by the mycorrhiza was promoted obviously, but photosynthetic water consumption had no effect when fertilizer was applied. Proper fertilizing promoted content of leaf of proline and soluble glucose, but no fertilizing or more fertilizing had no effect. Proline and soluble soil can reflect preferably the tolerance against drought of the host cuttings inoculated. Proper fertilizing lowered greatly the root vigor of the host cuttings inoculated, while the effect of more fertilizing and no fertilizing will decrease, So the tolerance against drought of the host cuttings inoculated was promoted. The promotion effect of the mycorrhizal inoculation on the N content of root,stem and leaf was disappear. The proportion of N element of the host cuttings inoculated was different under varying fertilizing conditions. The mycorrhizal inoculation promoted N element distribution of leaf and stem under the condition of no fetilizing, which was higher than root. The mycorrhizal inoculation promoted N element distribution of root and stem under the condition of proper fertilizing, which was higher than that of leaf. The mycorrhizal inoculation promoted N element distribution of leaf under the condition of more fertilizing, which was higher than that of root and stem. The mycorrhizal inoculation promoted P content of root,stem of the host cuttings inoculated if applying fertilizer properly or no fertilizer, but more fertilizing had no effect. In the experiment of plot of proper fertilizing, the mycorrhizal inoculation promoted obviously the content of P of leaf. But in the experiment of plot of no fertilizing and more fertilizing, the mycorrhizal inoculation had no effect. The proportion of P element of the cuttings inoculated was different under varying fertilizing conditions. The mycorrhizal inoculation promoted P element distribution of root and stem under the condition of no fertilizing, which was higher than that of leaf. The mycorrhizal inoculation promoted P element distribution of stem under the condition of proper fertilizing, which was higher than that of leaf and root. The mycorrhizal inoculation promoted P element distribution of leaf under the condition of more fertilizing, which was higher than that of root and stem.