Population structure and spatial distribution pattern of Quercus wutaishanica in Liupan Mountains

Objective  Quercus wutaishanica is the main tree species in Liupan Mountains. This study aims to analyze the spatial distribution pattern and correlation of Q. wutaishanica population in Liupan Mountains, so as to understand the growth and development status and population development process of Q. wutaishanica community in this area. Method  Based on 12 pure forest plots of Q. wutaishanica in Liupan Mountains, the population structure and dynamics of Q. wutaishanica were studied by static life table, diameter class structure, survival coefficient, mortality rate, disappearance rate and survival analysis. Point pattern was used to analyze the spatial pattern and spatial correlation of Q. wutaishanica population in Liupan Mountain area. Result  (1) The distribution of diameter class structure of Q. wutaishanica in the sample plots was close to the inverted J type, with good renewal status and stable structure. (2) The survival curve of Q. wutaishanica population was close to the deevey-Ⅱcurve. (3) The population of Q. wutaishanica was stable in the early and middle stages and declined in the late stage. (4) The young and middle age individuals of Q. wutaishanica showed aggregation distribution in small scale, which changed from aggregation distribution to random distribution with the increase of scale. Individuals of near maturity tended to distribute evenly on small scale and randomly on large scale. Conclusion  The tree population of Q. wutaishanica in Liupan Mountains is relatively stable and in good regeneration condition. The young and middle age individuals of Q. wutaishanica show aggregation distribution in small scale, and the correlation between middle age and near mature individuals is not obvious in large scale, independent of each other. In order to keep the structure of Q. wutaishanica forest stable, human regulation should be strengthened to ensure the stable environmental conditions for population regeneration of Q. wutaishanica forest. [Ch, 8 fig. 2 tab. 24 ref.]