Abstract: Based on the measurement of condensation water on different size sand gravels at the fringe of desert oasis in Linze County from July to October 2006, the relationships between the grain size of sand gravels and the amount of cond ensation water were analyzed. During the period of July-October, the sand grave ls with grain size <002 mm had the highest average amount of condensation wate r (0097±0032 mm·d-1), followed by those of <2 mm (0072±0026 mm· d-1), 02〖KG-*2〗-〖KG-*7〗002 mm (0059±0016 mm·d-1), 2〖K G-*2〗-〖KG-*7〗02 mm (0057±0018 mm·d-1), and 5〖KG-*2〗-〖KG-*7〗 2 mm (0052±0021 mm·d-1). In a word, the amount of condensation w ater on the sand gravels decreased with their increasing grain size. The effect of sand-mulching in decreasing farmland soil evaporation in dry season was discussed.

Key words: N deposition addition, South subtropics, Forests, Soil fauna