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Biological stabilizing sands techniques

Compared with other stabilizing sands techniques biological techniques have more benefits: (1) lower cost and stable function; (2) improvement of soil properties; (3) improvement of ecosystem of sandy areas; (4) stabilizing sands plants maybe used as feed, fuel, wood, fertilizer etc. Conventional biological stabilizing sands techniques are difficult to practice, which include man-made forest/shrubbery, aerial seeding, so some operational and easy techniques are adopted in China.

A sands enclosure to restore natural vegetation is a typical and major measure of biological stabilizing sands technique. It refers to fencing in vegetation-destroyed land in arid and semi-arid areas so as to prevent human activities and animal use, and gradually restore natural vegetation, tte ways of enclosure are fully enclosure, half- enclosure and alternate enclosure. Full enclosure means to forbid all the hu-

Fig. 18.1. Sands enclosure in pasture

man activities destroying plants growth, tte duration of enclosure is 3-5 years, sometimes 8-10 years. Half- enclosure is implemented mainly during the season. Alternate enclosure refers to be implemented around the divided zones in turn. Sands enclosure is proving to be the low cost alternative and highly efficient (Fig. 18.1).

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