采用逐步扩大范围的方法确定影响梭梭(Haloxylon ammodendron)对象木的最佳竞争范围,通过Hegyi单木竞争指数模型,定量研究了准噶尔盆地南缘天然梭梭群落种内竞争关系。结果表明:在梭梭群落内,对象木的最佳竞争距离为6 m,梭梭种内竞争强度随着梭梭径级的增大而逐渐减小;不同生境的梭梭种内竞争强度的大小顺序为固定沙丘> 半固定沙丘> 流动沙丘;梭梭种内竞争强度与对象木基径的关系服从幂函数关系。当梭梭基径为1~10 cm时,竞争强度随基径的增加急剧减小,并在基径5~10 cm时形成明显拐点,当梭梭基径大于10 cm时,梭梭受到的竞争压力变化较为平缓,所建立的模型可以预测梭梭群落种内竞争强度。
The method of gradually increase the zone of interaction,the optimum competitive scopes,which influence objective tree of Haloxylon ammodendron,was studied.Then the intraspecific competition intensity of natural H.ammodendron in the southern margin of Junggar Basin was quantificationally analyzed using the competition index (CI) model for individual tree introduced by Hegyi.The results revealed the optimum competitive scope of objective tree was 6 m within H.ammodendron population; The intraspecific competitive intensity was different in the different area.The intraspecific competitive intensity in different regions ranked in order of fixed dune,semi-fixed dune,migratory dune; The competition intensity decreased with increase of basal diameter (D) and the competition intensity changed significantly,especially it decreased sharply in the basal diameter ranges of 1-10 cm,and the inflection point occurred at basal diameter range of 5-10 cm,but the competition intensity had no significant variation when basal diameter larger than 10 cm. The equation was suitable for describing the relationship between competition intensity and basal diameter of H.ammodendron population in the southern margin of Junggar Basin.
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