科尔沁沙地盐蒿种群的空间分布格局及关联性

以科尔沁沙地半固定沙丘和流动沙丘两种不同沙丘上的盐蒿(Artemisia halodendron)种群为研究对象,采用空间点格局方法研究了 0～20 m尺度上盐蒿种群的空间分布格局及其关联性.结果表明,半固定沙丘上盐蒿种群的数量远大于流动沙丘,不同生长发育阶段的种群结构呈偏正态分布,属于稳定型种群;流动沙丘上不同生长发...

Spatial distribution pattern and correlation of Artemisia halodendron population in Horqin Sandy Land,China

Artemisia halodendron population on semi-fixed and mobile sand dunes of Horqin Sandy Land was studied. The spatial distribution pattern and its correlation of Artemisia halodendron population at 0-20 m scale on two different types of sand dunes were analyzed by using spatial point pattern method. The results showed that the number of Artemisia halodendron on semi-fixed sand dune was much larger than that in mobile sand dune. The population structure in different growth and development stages on semi-fixed sand dunes showed biased normal distribution,belonging to stable population. The population structure at different growth and development stages on the mobile dunes showed an inverse "J" shape,belonging to the growth population. The Artemisia halodendron population and its individuals at different growth and development stages on the two different types of sand dunes showed an aggregation distribution. With the increase of the scale,the aggregation intensity gradually weakened,and the population tended to change to random distribution. The positive correlation between individuals at different growth and development stages in semi-fixed dunes was stronger than in mobile sand dunes. There were positive correlations between seedling and vegetative plants,seedling and reproductive plants,vegetative and reproductive plants on the two types of sand dunes,and the correlations were gradually weakened with the increase of scale. The results of this study are of great significance to the conservation and utilization of Artemisia halodendron population in this area,and also have great significance for the formulation of wind prevention and sand fixation in this area in the future.