The technique of rainwater harvesting, storage and utilization is the one of important methods to solve water resources shortage in the arid and semiarid zone.

The study was carried out within the Alxa desert steppe, Inner Mongolia of north China, Alxa desert steppe is one of serious degraded areas in the semiarid zone of north China.

The trees are most heavily concentrated in the south of Maranh?o, in the transition zone between Brazil's semiarid northeast and the Amazon rainforest.