峨眉山桫椤种群结构与动态特征
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引用本文:吉 也,曹孟岩,白楚锋,金林琦,李 畅,李 萍.峨眉山桫椤种群结构与动态特征[J].西北植物学报,2019,39(3):543~551
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吉 也,曹孟岩,白楚锋,金林琦,李 畅,李 萍* (西南交通大学 生命科学与工程学院成都 611756) 
基金项目:国家级大学生创新创业训练计划(201810613082)
中文摘要:以峨眉山桫椤种群为研究对象,采用实地调查方法,以高度级(H)代替年龄级,通过建立种群静态生命表、绘制存活曲线、计算生存函数描绘其种群结构与动态特征,并运用时间序列预测模型,研究其种群生存现状及未来发展趋势。结果显示:(1)峨眉山桫椤种群结构呈现不规则金字塔形,桫椤种群内中龄级(0.6 m<H≤2.1 m)的数量占样本总量的58.5%,幼龄级(H≤0.6 m)与老龄级(H>4.8 m)分别占比12.7%和1%,幼龄个体匮乏,种群结构的维持与发展主要依靠中龄和成龄级(2.1 m<H≤4.8 m)个体。(2)考虑未来外部干扰下的总体数量动态指数V′pi=3.027>0,种群总体呈现增长趋势,但增长幅度逐渐降低。(3)存活曲线趋向于Deevey Ⅱ型,前期死亡率较为平稳,但后期死亡率有较大幅度上升,表明峨眉山桫椤种群具有前期减少,中期稳定,后期衰退的特点。(4)时间序列预测显示,桫椤种群在短暂增长过后,若不加以保护会逐渐走向衰退,甚至濒危。研究表明,峨眉山桫椤种群濒危的主要因素是幼树个体损失无法补充种群更新,建议在峨眉山设立局部自然保护区,并对幼苗进行抚育,加强对高效育种技术的研究,促进峨眉山桫椤种群的复壮与更新。
中文关键词:桫椤  种群结构  静态生命表  生存函数  时间序列预测
 
Population Structure and Dynamics of Alsophila spinulosa in Mount Emei
Abstract:An investigation was conducted on the population structure and dynamics of Alsophila spinulosa in Mount Emei with the on the spot investigation method, adopting height class (H) to represent age class. By establishing a static life table, plotting a population survival curve, analyzing the survival function, we characterized the population structure and dynamics. In addition, by constructing a time series prediction model, was also examined and predicted the current survival status and future development trend of the population, respectively. Results showed: (1) the population structure of A. spinulosa in Mount Emei was irregular pyramidal. The middle aged individuals (0.6 m<H≤2.1 m) shared 58.5% of the total population amount, while, the young (H≤0.6 m) and the elder ones (H>4.8 m) only accounted for 12.7% and 1%, respectively. Young individuals were deficient, and the maintenance and development of the population structure mainly relied on the middle aged and adult (2.1 m<H≤4.8 m) individuals. (2) The dynamic index of population age structure quantity with future external disturbances considered V′pi=3.027>0 showed an overall, but gradually declining growth of the population. (3) The population survival curves tended to be Deevey Ⅱ type, as the mortality rate remained stable among the 1st-6th class, but increased acutely from the 7th class to the 8th class, which indicated the following dynamic features of the A. spinulosa population: early stage, declining; middle stage, stable; and last stage, recession. (4) Time series prediction revealed that after a short period of growth, the population of A. spinulosa would gradually decline, and the species might even become endangered if not protected. In conclusion, the research showed the loss of young individuals and failure of population replenishment is the main cause of A. spinulosa population’s endangerment in Mount Emei. Our suggestions including the establishment of local nature reserves, artificial breeding, and the advances of research into high efficient breeding techniques are proposed for the rejuvenation and renewal of A. spinulosa there.
keywords:Alsophila spinulosa  population structure  static life table  survival function  Time series analysis
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