Study On The Mechanism Of Microbial Inoculum Improving The Surrvial Rate Of Pinus Tabulaeformis In Shanbei Loess Plateau

This paper mainly studies the BGB t and PT for pinus tabulaeformis afforestation survival rate, the influence of tree height and ground diameter,and the change of soil nutrients and moisture.Provide a theoretical basis for the application of BGB and PT in the vegetation restoration of the hilly and gully Loess Plateau.There are three aspects of the main research:(1) PT can increase the survival rate of pinus tabulaeformis, tree height, ground diameter growth significantly;it can obviously increase the nutrient content of soil nitrogen. phosphorus and potassium, organic matter during0to40cm, and the influence on40to60cm soil layer is relatively small; And it has some effects on the improvement of the soil pH. soil water content.(2) BGB can increase the survival rate of pinus tabulaeformis, tree height, ground diameter growth significantly;can improve the soil nutrient content significantly; and the effect decreases with the increase of soil depth, the influence of the organic matter content is the most significant;BGB can improve the soil pH value obviously,it has a significant effect on soil moisture content for20to40cm soil layers. The results show that BGB can increase the survival rate of pinus tabulaeformis,tree height, ground diameter growth significantly; and the more the better within the scope of the study.(3)PT and BGB can increase the survival rate of pinus tabulaeformis, tree height, ground diameter growth significantly; it can obviously increase the nutrient content of soil nitrogen, phosphorus and potassium, organic matter, And combination performs better than the separate use of them; it can significantly improve the soil pH value,but the effect is lesser than useing PT alone; the influence of soil water content on20to40cm is significant,and the effect is increasing with the dosage’s increasing of BGB in the study.