Preparation method of composite crust of lichen, moss and algae

The invention provides a preparation method of a lichen, moss and algae composite crust, and relates to the technical field of environmental biologication.The preparation method comprises the steps that raw materials are selected, the raw materials are lichen crust, moss crust and green algae crust, and when used for environmental pollution monitoring, an existing single-layer crust is low in density, single in tissue component and limited by environmental factors; every two of lichen crust, moss crust and green alga crust are combined to form three groups of raw material crust for tissue isolation culture, and after tissue culture, the three groups of raw material crust are co-cultured to form composite crust for soil protection and environmental pollution monitoring. The whole density and the richness of the composite crust are increased, organisms matched with the corresponding environment are arranged in the composite crust for different outdoor environments, the composite crust is not limited by the envi