Abstract: On the basis of investigation of tracking excavation of clones, the regulation of clonal growth of Hippophae rhamnoides L. subsp sinensis population in Mu Us sandland were analyzed. The results indicated that the structure of ramet group (ramets within a clone) was characterized by a transformation from an incr easing type to a stable type, then to a decreasing type. During the decreasing p rocess, the clones could recover its stable structure by regulating ramet birth rate. In the meantime of structure change of ramet group, the population changed the clonal growth form by the regulation of ramet mortality, which increased th e enduring of clone population and its utilization efficiency to space and resou rces as well.

Key words: Hippophae rhamnoides L subsp sinensis, Clonal growth, Ramet group, Structure dynamics, Mu Us sandland, RCPs, ANPP, LANDIS-Ⅱ model, forest aboveground biomass