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长白山次生针阔混交林乔木幼苗存活的影响因素分析
收稿日期: 2015-10-13
录用日期: 2016-03-26
网络出版日期: 2016-07-07
基金资助
国家“十二五”科技支撑计划项目(2012BAD22B0203)
Effects of biotic neighbors and habitat heterogeneity on tree seedling survival in a secondary mixed conifer and broad-leaved forest in Changbai Mountain
Received date: 2015-10-13
Accepted date: 2016-03-26
Online published: 2016-07-07
基于长白山次生针阔混交林样地, 以520个1 m × 1 m幼苗样方中胸径小于1 cm的乔木幼苗为研究对象, 选取2013年和2014年的幼苗调查数据, 运用广义线性混合模型(GLMM)分析了生物邻体和生境异质性对幼苗存活的影响, 探讨了次生针阔混交林幼苗存活影响因素及物种共存机制。结果表明: (1)适宜大树生长的局域生境同样也适宜幼苗的存活, 幼苗存活率与土壤含水量和有效氮等土壤养分显著正相关。(2)幼苗个体之间存在明显的竞争, 较多的幼苗邻体显著降低幼苗的存活率。同种大树邻体和同种幼苗邻体与幼苗存活显著负相关, 表明存在负密度制约效应。(3)随着幼苗年龄的增加, 生境异质性对幼苗存活的影响逐渐增大。该研究证实了密度制约效应和生境异质性对幼苗存活有着重要影响, 其相对重要性随着幼苗年龄级、功能群以及物种种类而变化。
刘帅, 廖嘉星, 肖翠, 范秀华 . 长白山次生针阔混交林乔木幼苗存活的影响因素分析[J]. 植物生态学报, 2016 , 40(7) : 711 -722 . DOI: 10.17521/cjpe.2015.0366
Aims Our study aimed to understand the effects and the relative importance of biotic neighborhood and habitat heterogeneity for tree seedling survival in a secondary mixed conifer and broad-leaved forest in Changbai Mountain, north-eastern China.
Methods The generalized mixed linear model was used to examine the relative effects of biotic neighborhood and habitat heterogeneity on seedling survival over two years.
Important findings Our results showed that both biotic neighborhood and habitat heterogeneity had significant effects on the seedling survival at community level. The local environment suitable for the adult growth was also suitable for seedling survival. The soil moisture and soil available nitrogen exhibited significant positive effects on seedling survival. On the other hand, seedling density had significant negative effects on seedling survival due to the individual competition. Particularly, we found significant negative density-dependent effects on seedling survival which was caused by conspecific adult and seedling neighbors. As expected, with the increasing of seedling survival age, the habitat heterogeneity became more important on seedling survival. These results suggest that both local biotic neighborhood and habitat heterogeneity drive seedling survival in this temperate forest, and their relative importance varies with different seedling age classes and species traits.
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