柳树表现出比树木更强的同物种负密度依赖于热带苗木生存的树木
Zhenhua Sun1,2, Nujaree Prachanun1, Arunkamon Sonsuthi1
1Yunnan Key Laboratory of Forest Ecosystem Stability and Global Change, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.
Ecology
|September 17, 2025
概括
莲花表现出比热带森林中的树更强的负密度依赖,影响幼苗的生存. 这凸显了不同的生态战略及其在维持热带森林多样性方面的作用.
科学领域:
- 生态生态学 生态生态学
- 植物生物学 植物生物学
- 森林科学 森林科学 森林科学
背景情况:
- 同特定负密度依赖 (CNDD) 显著影响植物人口统计学,特别是在多样化的热带森林.
- 在植物生长形式上,CNDD的影响可能会有所不同,例如树木和柳.
研究的目的:
- 量化和比较同物种负密度依赖 (CNDD) 对热带森林树木和柳幼苗生存的人均影响.
- 调查树木和柳之间CNDD流行率的年间变化.
主要方法:
- 利用分层贝叶斯模型分析了来自87种树和56种柳的3万多棵幼苗的生存数据.
- 在热带森林环境中,评估了邻居密度对幼苗存活的影响,跨越两个1年人口普查间隔.
主要成果:
- 与树相比,Lianas在苗木生存上表现出人均CNDD的四到六倍.
- 一个单独的同类邻居降低了树苗的生存率,降低了1.2%至-1.8%,而树苗的生存率仅为-0.3%.
- 树木在CNDD患病率 (47%-11%) 中的年间变化比树 (13%-23%) 更大.
结论:
- 人均邻近效应对于准确评估植物群落中CNDD强度至关重要.
- 对比的CNDD模式表明了不同的生态策略和密度取决于和树之间的环境波动的反应.
- 柳树和树木可能采用不同的驱动CNDD的机制,导致它们对热带森林多样性维护的贡献具有不同的稳定性.
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