| It is one of the main approaches of drought-resistant afforestation in the towns of the arid and semi-arid areas at present by using all sorts of new materials of moisture-preservation, which are American dry water( solid water), "KeHan 98" hygrescopic, plastic film, etc, to undertake afforestation experiments, so as to ameliorate the soil water condition around the root system of plants, and improve the water bearing capacity of the soil. In this paper, combined with the research on study subject, by undertaking field experiments and indoor simulation in the semi-arid ShenDong mine field, a through study was made on maintenance of water and water losses rule of moisture-conservative materials mentioned above, aiming at reducing the restrictive effect on afforestation due to lack of water in arid and semi-arid areas, and increasing the forest coverage in urban.The field experiments and indoor simulation have shown: (1) In contrast to the control treat, all kinds of treats with drought-resistant and moisture-preservative materials can increase the soil water content around the roots. After two months continuous drought, the soil volume moisture content of the control treat in the root system layer was only 3.31%, while in the American dry water treat the figure was 5.76%, 4.47% in the "KeHan 98" treat, and 10.11% in the on-ground film treat. Relative to the control, they increased 74.02%, 35.05% and 205.44% respectively. (2) Through the field experiments, among all treats, the maximum afforestation survival rate was in the underground film treat, averaging 89.48% per tree. The second largest one was 85.82% in the "KeHan 98" treat, men 79.53% in the American dry water treat and 75.62% in the on-ground film treat, while only 70.61% in the control. (3) Because of the different physiological and ecological characteristics, tree species differed in the adaptabilities to drought-resistant and moisture-preservative materials, which needs further studying.
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