Screening of green substrate suitable for spraying and sowing in uncovering slope of arid and semi-arid zone

Arid and semi-arid region of uncovering slope in Loess Plateau had less annual precipitation with dry climate and intense evaporation in Gansu Province which leads to many problems of uncovering slope greening plants including germination difficult and lower survival rates. The present study compared the physicochemical properties of 6 different spraying and sowing substrate including biological fertilizer, super absorbent polymer, peatmoss, soil, straw and fast released fertilizer with different dosage and proportion and their effects on slope water evaporation, vegetation coverage and biomass in uncovering slope of loess plateau to screening green substrate suitable for these areas. The results showed that the substrate with peatmoss, soil and straw in a ratio of 40:45:15 and addition with 500 g·m-2 saline microbial fertilizer, 1 g·m-2 absorbent polymer and 25 g·m-2 fast released fertilizer can effectively reduce water evaporation, increase the vegetation coverage and aboveground biomass which was the most benifical for the growth of plants of Loess Plateau uncovering slope.