欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

桂林岩溶石山青冈种群数量动态

黄冬柳,梁士楚,姜勇*   

  1. (广西师范大学珍稀濒危动植物生态与环境保护教育部重点实验室, 广西师范大学生命科学学院, 广西桂林 541006)
  • 出版日期:2019-03-10 发布日期:2019-03-10

Quantitative dynamics of Cyclobalanopsis glauca population in Guilin karst mountainous areas.

HUANG Dong-liu, LIANG Shi-chu, JIANG Yong*   

  1. (Key Laboratory of Ecology of Rare and Endangered Species and Environment Protection (Guangxi Normal University), Ministry of Education; College of Life Sciences, Guangxi Normal University, Guilin 541006, Guangxi, China).
  • Online:2019-03-10 Published:2019-03-10

摘要: 青冈(Cyclobalanopsis glauca)是桂林岩溶石山常绿落叶阔叶混交林的优势种。以种群生命表和生存分析理论为基础,采用胸径大小分级法,编制了静态生命表,绘制了存活曲线、死亡率曲线、消失率曲线和生存函数曲线,分析了青冈种群数量特征,同时结合种群动态量化方法和时间序列预测模型,进一步解析了青冈的种群数量动态变化特征。结果表明:青冈种群的年龄结构近似于倒“J”型,主要集中在Ⅰ龄级(个体数量比例占69.49%),但成功定植于下一龄级的个体比例较低;种群趋于Deevey Ⅱ型,即稳定型;死亡率和消失率曲线变化趋势基本一致,在第Ⅰ、Ⅵ龄级出现高峰期;生存率单调下降,累计死亡率单调上升,死亡密度曲线与危险率曲线变化规律一致;青冈种群具有前期锐减、中期稳定、后期衰退的特点;种群数量变化动态指数VpiVpi′均大于0,种群稳定且略微增长,易受环境影响;在未来2、4、6个龄级时间后,老龄个体逐渐增多,若不及时抚育幼苗,种群将难以保持稳定。

关键词: 猪粪, 稻草, 镉污染黄泥土, 生物活性

Abstract: Cyclobalanopsis glauca is a dominant species in the evergreen and deciduous broadleaved mixed forest in Guilin karst mountainous areas. Little information is available about its population status. Here, we analyzed population structure and dynamics of C. glauca by using basic statistics including curves of survival rate, mortality rate, and disappearance rate as well as four survival function curves based on diameter size classes. We performed a time series model to predict the dynamics of C. glauca population in karst ecosystems. The results showed that the age structure was in an inverse-J shape, and mainly aggregated on age class Ⅰ (69.49%). The proportion of individuals successfully colonized in the next age class was very low. The population approximately belonged to the Deevey-Ⅱ  type and grew stably at present stage. Both the mortality and disappearance rate curves exhibited the same trend, with peaks in the first and sixth age classes. The survival rate of the population monotonically decreased, while the cumulative mortality rate increased, and mortality density and risk functional curves of the population varied in a similar trend. The C. glauca population sharply decreased in the young-aged period, stabilized in the middle-aged period, but declined in the old-aged period. The dynamic indices, Vpi and Vpi′, were greater than zero, and showed a stable-growth type population with a little increase butbeing sensitive to external disturbance. Time sequence model suggested that the oldaged individuals would increase in the age-classes of 2, 4, and 6 in the future, and that if the seedlings were not reared in time, the population would be unable to maintain stability.

Key words: Pig manure, Rice straw, Cd-contaminated permeable paddy soil, Biological activity