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为探讨立地类型对林分特征的影响机制,以新疆西部天山云杉林中系统布设的监测样方数据为基础,研究了天山云杉林分结构特征与立地因子之间的关系.在192个20 m×20 m调查样方中共调查到1 909个DBH≥1 cm植株,胸高断面积共计291.632 m2;天山云杉株数和胸高断面积最大,分别占林分总株数和总断面积的91.5%和97.4%.扩散系数C、平均拥挤度m*、聚块性指数m*/m和负二项分布参数K分析显示,天山云杉、天山桦、天山花楸、天山茶藨子和刚毛忍冬均呈聚集性分布.天山云杉喜坡度较大的立地环境,而坡度较缓的阴坡及半阴坡不适合天山云杉的生长和发育;天山桦喜坡度较缓的阴坡及半阴坡立地环境;天山茶藨子喜坡度较缓的阳坡及半阳坡立地环境.天山林区放牧干扰在一定程度上影响树种分布格局和立地偏好分析结果.
In order to explore the mechanism of the site type affecting the stand characteristics, the relationship between the site structure characteristics and site factors of the Picea crassifolia forest was studied based on the systematic monitoring data collected from the Picea crassifolia forests in western Xinjiang, A total of 1 909 DBH ≥1 cm plants were surveyed in 20 m × 20 m sampling plots. The total area of chest height was 291.632 m 2. The area of spruce trees and chest height were the largest, accounting for 91.5% And 97.4% respectively.The analysis of diffusion coefficient C, average crowding degree m *, agglomeration index m * / m and negative binomial distribution parameter K showed that Tianshan spruce, Tianshan birch, Tianshan Sorbus, Tianshan spruce grazing habitat larger slope environment, and the more gentle slope and semi-shady slope is not suitable for the growth and development of Tianshan spruce; Tianshan Betula slope more gentle shady and half shade The slope environment and the environment in the sunny slope and the semi-sunny slope on the slopes of Camellia sinensis in Tianshan Mountains grazing disturbance affect the tree species distribution and site preference analysis to a certain extent.