植物生态学报 ›› 2018, Vol. 42 ›› Issue (6): 653-662.DOI: 10.17521/cjpe.2018.0025

• 研究论文 • 上一篇    下一篇

吉林蛟河针阔混交林乔木幼苗组成及其密度格局影响因素

孟令君,姚杰,秦江环,范春雨,张春雨,赵秀海()   

  1. 北京林业大学国家林业和草原局森林经营工程技术研究中心, 北京 100083
  • 收稿日期:2018-01-16 修回日期:2018-06-09 出版日期:2018-06-20 发布日期:2018-06-20
  • 通讯作者: 赵秀海
  • 基金资助:
    国家重点研发计划重点专项(2017YFC0504005);国家自然科学基金(31670643)

Drivers of composition and density pattern of tree seedlings in a secondary mixed conifer and broad-leaved forest, Jiaohe, Jilin, China

MENG Ling-Jun,YAO Jie,QIN Jiang-Huan,FAN Chun-Yu,ZHANG Chun-Yu,ZHAO Xiu-Hai()   

  1. Research Center of Forest Management Engineering of State Forestry and Grassland Administration, Beijing Forestry University, Beijing 100083, China
  • Received:2018-01-16 Revised:2018-06-09 Online:2018-06-20 Published:2018-06-20
  • Contact: Xiu-Hai ZHAO
  • Supported by:
    Supported by the Key Project of National Key Research and Development Plan(2017YFC0504005);the Program of National Natural Science Foundation of China(31670643)

摘要:

以吉林蛟河次生针阔混交林42 hm 2固定监测样地中209个幼苗监测站内的乔木幼苗为研究对象, 基于2016和2017年幼苗调查数据, 探究幼苗物种组成、数量动态等特征, 并运用广义线性混合效应模型分析了幼苗密度与生物邻体及其生境因素的相关性。结果表明: (1)该样地内所有幼苗监测站共调查到幼苗4 245株, 分属10科12属18种, 新生幼苗的数量在物种和调查年份间均有明显差异, 其中水曲柳(Fraxinus mandschurica)和紫椴(Tilia amurensis)幼苗表现出大量出生和死亡的动态特征。(2)群落水平上, 幼苗密度与局域同种成体胸高断面积之和、土壤全磷和有效钾等养分含量显著正相关, 适宜大树生长的生境同样适宜幼苗的生长。(3)水曲柳幼苗密度的影响因素与群落水平一致, 红松(Pinus koraiensis)存在明显的生境偏好, 在湿度较小、土壤全磷、有效氮和有效磷含量较低的生境中密度更高。相对于多年生幼苗, 同种成年邻体对当年生幼苗密度影响更加显著。该研究证实了扩散限制和生境过滤共同影响幼苗密度格局, 生物邻体和生境异质性的相对重要性随幼苗物种种类和年龄级变化。

关键词: 次生针阔混交林, 广义线性混合模型, 乔木幼苗密度, 生物邻体, 生境异质性

Abstract:

Aims Our aim is to explore the composition and temporal dynamics of tree seedlings and to further understand the impacts and relative importance of biotic neighborhood and habitat heterogeneity on seedling density patterns in a secondary mixed conifer and broad-leaved forest in Jiaohe, Jilin Province, North-eastern China.

Methods We established 209 seedling census stations in the mixed conifer and broad-leaved forest. Based on two seedling censuses conducted in 2016 and 2017, we analyzed species composition and quantitative dynamics of seedlings. Generalized mixed linear models were used to test the relative effects of biotic neighborhood and habitat heterogeneity on seedling density patterns.

Important findings (1) A total of 4 245 seedlings were investigated in all seedling census stations of this plot, belonging to 12 genera, 10 families and 18 species. The number of new-born seedlings varied greatly among species and census years. Fraxinus mandschurica and Tilia amurensis seedlings occurred and died in large numbers. (2) At the community level, the sum of conspecific adult basal area, the soil total phosphorus and available potassium exhibited significant positive effects on seedling density. The habitat suitable for trees was also suitable for seedlings. (3) The factors influencing seedling density of Fraxinus mandschurica were consistent with those of seedling density at the community level. Pinus koraiensis had significant habitat preference, it had higher density in the habitat with lower moisture, soil total phosphorus, available nitrogen, and available phosphorus. Conspecific adult neighbor effects on annual seedling density was more significant than on perennial seedling density. This study suggests that dispersal limitation and habitat filtering together affect seedling density pattern, and the relative importance of biotic neighbors and habitat heterogeneity varies among seedling species and age classes.

Key words: secondary mixed conifer and broad-leaved forest, generalized linear mixed-effect model, tree seedling density, biotic neighbor, habitat heterogeneity