PROBLEM TO BE SOLVED: To solve problems of various types of greening to stop a continuously increasing area of wide desert in recent years, and provide a satisfactory greening method.SOLUTION: In solving means of the present invention, trees and various types of plants are allowed to take roots and raised to realize greening of rich environment by using super water-repellent nanofiber sheet. The super water-repellent nanofiber sheet is spread on dried desert, sand is piled on it, water pumped up from groundwater or the like is injected into the piled sand through a nanofiber film desalination apparatus by a required amount to form a reservoir, trees and various types of plants are allowed to take roots into the reservoir to realize greening of desert.
