Abstract:

Based on the phenomenon that the dominance in border row of plantation in arid and semi_arid region is obviously better than that in humid region, characteristics of water utilization of sand soil in stands of local main silviculture tree species and their outside of border row and among belt of stands in orderly ranks have been determined in different climatic regions. The trees can reduce the sand soil water content at 8～10 m in the outside of border row. And gradient of soil water is formed that can make the water permeate from the soil at and beyond 8～10 m to basal portion of trees, which becomes the necessary condition of normal growth of trees in border row in drought year. It indicates that there are main utilization belt of soil moisture and supplying belt of soil water leakage in border rows of stands. And the mode of characteristics of soil water utilization in plantation with reasonable disposition has been put forward. Finally, this paper discusses that the stands in orderly ranks planted according to the mode at same density and coverage is obviously better than the stands distributed evenly at same distances between rows and hills at the aspect of benefits of wind break and sand fixation.

Key words: Dominance in border row, Stands in orderly ranks, Characteristics of water utilization