Density dependence across multiple life stages in a temperate old-growth forest of northeast China.
Density dependence across multiple life stages in a temperate old-growth forest of northeast China.
复制标题
中国东北温带原始森林多个生命阶段的密度依赖性
DOI：
10.1007/s00442-012-2481-y
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发表时间：
2013-05
期刊：
影响因子：
2.7
通讯作者：
Kim, Ji Hong
中科院分区：
文献类型：
--
作者：
Piao, Tiefeng;Comita, Liza S.;Jin, Guangze;Kim, Ji Hong
近年来对物种共存的研究表明，密度依赖是植物种群数量调节的重要机制。然而，很少有研究的密度依赖进行了一个以上的生活史阶段或控制栖息地异质性，这可能会影响生存和掩模密度依赖的空间格局。我们探讨了在中国东北的温带森林中，多个生命阶段的密度依赖性的普遍性，以及控制栖息地异质性的影响。我们使用广义线性混合效应模型来测试密度依赖的死亡率的幼苗和空间点模式分析，以检测密度依赖的树苗到少年的过渡。同种邻居在两个生活阶段的植物的生存有负面影响。在幼苗阶段，我们发现一个负面影响同种幼苗邻居的生存时，分析所有物种组合。然而，在物种水平上的分析，只有2的11个焦点物种受到同种邻居的负面影响，表明物种之间的密度依赖的强度变化很大。控制生境异质性并没有改变我们的研究结果的密度依赖在苗期。对于幼苗到幼龄的过渡阶段，15个焦点种中有11个表现出局部尺度（<10 m）的同种稀疏模式，与负密度依赖性一致。结果有所不同，这取决于我们是否控制了栖息地的异质性，表明未能考虑栖息地的异质性可以掩盖密度依赖的模式。我们的结论是，密度依赖性可能会促进树种共存的多个生活史阶段，在这个温带森林。
Recent studies on species coexistence suggest that density dependence is an important mechanism regulating plant populations. However, there have been few studies of density dependence conducted for more than one life-history stage or that control for habitat heterogeneity, which may influence spatial patterns of survival and mask density dependence. We explored the prevalence of density dependence across multiple life stages, and the effects of controlling for habitat heterogeneity, in a temperate forest in northeast China. We used generalized linear mixed-effects models to test for density-dependent mortality of seedlings and spatial point pattern analysis to detect density dependence for sapling-to-juvenile transitions. Conspecific neighbors had a negative effect on survival of plants in both life stages. At the seedling stage, we found a negative effect of conspecific seedling neighbors on survival when analyzing all species combined. However, in species-level analyses, only 2 of 11 focal species were negatively impacted by conspecific neighbors, indicating wide variation among species in the strength of density dependence. Controlling for habitat heterogeneity did not alter our findings of density dependence at the seedling stage. For the sapling-to-juvenile transition stage, 11 of 15 focal species showed patterns of local scale (<10 m) conspecific thinning, consistent with negative density dependence. The results varied depending on whether we controlled for habitat heterogeneity, indicating that a failure to account for habitat heterogeneity can obscure patterns of density dependence. We conclude that density dependence may promote tree species coexistence by acting across multiple life-history stages in this temperate forest.
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