夏威夷低地湿林中影响幼苗再生的光照质量和空间变化

IF 5 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Journal of Applied Ecology Pub Date : 2024-09-09 DOI:10.1111/1365-2664.14775
Jodie R. Rosam, Laura Warman, Rebecca Ostertag, Ryan Perroy, Susan Cordell
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引用次数: 0

摘要

热带森林林下植物往往光照有限。红-远红比(R:FR)是光照质量的一个有用而可靠的指标,其空间变化会影响本地和非本地幼苗之间的竞争。虽然一些夏威夷低地湿润森林(HLWF)的透光率已被量化,但还没有关于林下光照的空间分布如何随物种入侵而变化,或幼苗再生模式与光照是否有关联的信息。我们测量了林下光照的 R:FR 值,以评估三种 HLWF 森林类型的光照质量:原生植物主导型、部分入侵型和草莓番石榴主导型,从而量化林下(0-50 厘米高)的光照质量。我们还确定了光质与本地和非本地幼苗的存在、多样性和丰度之间的关系。这些数据可以帮助确定 HLWF 的恢复潜力。线性混合效应模型显示,以本地植物为主的森林的R:FR明显大于以P. cattleyanum为主的森林,这表明随着入侵的增加,光环境发生了变化。R:FR 的异质性在不同地点的差异比在不同森林类型之间的差异更大。在以原生植物为主的森林和部分入侵的森林中,低质量R:FR(0.0-0.40)类别中的原生幼苗较多,而中等(0.41-0.70)和高质量(≥0.71)光照类别中的原生幼苗较少。与部分被入侵的森林相比,以原生植物为主的森林具有更高的物种丰富度和原生幼苗的丰度,这可能是由于繁殖体的可用性。然而,幼苗的空间集群、本地幼苗与光环境的不匹配以及相当比例的开阔优质微地,都突出表明,从长远来看,HLWF中的本地物种的生长条件并不理想。综合与应用。尽管不同地点之间存在差异,但以本地物种为主和部分受入侵的森林仍具有保护价值。可针对不同的 R:FR 环境和不同的空间尺度增加幼苗,但 R:FR 与幼苗数量之间缺乏强有力的关系表明,在幼苗增殖或其他管理活动中应考虑光质以外的其他因素。
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Light quality and spatial variability influences on seedling regeneration in Hawaiian lowland wet forests
Tropical forest understories tend to be light‐limited. The red‐to‐far‐red ratio (R:FR) is a useful and reliable index of light quality and its spatial variability can influence competition between native and non‐native seedlings. While per cent light transmittance has been quantified in some Hawaiian lowland wet forests (HLWF), no information exists on how the spatial distribution of understorey light varies in relation to species invasion, or if patterns of seedling regeneration and light are linked. We measured the R:FR of light in the understorey to assess light quality in three HLWF forest types: native‐dominated, partially invaded and Psidium cattleyanum‐ (strawberry guava) dominated to quantify light quality in the understorey (0–50 cm height). We also identified relationships between light quality and native and non‐native seedling presence, diversity and abundance. Together, these data can help to determine the restoration potential of HLWF. Linear mixed‐effect modelling showed that native‐dominated forests had significantly greater R:FR than P. cattleyanum‐dominated forests, demonstrating a transformation in the light environment with increased invasion. Heterogeneity in R:FR varied more across sites than among forest types. In both native‐dominated and partially invaded forests, there were more native seedlings in the low‐quality R:FR (0.0–0.40) category and fewer in the medium‐ (0.41–0.70), and high‐quality (≥0.71) light categories than would be expected by chance, and there were no native seedlings in the P. cattleyanum‐dominated forests. Native‐dominated forests had greater species richness and abundance of native seedlings than the partially invaded forests, likely due to propagule availability. However, the spatial clustering of seedlings, the mismatch of native seedlings in light environments less suitable, and a considerable proportion of open high‐quality microsites, highlights that conditions are not optimal for native species in HLWF in the long term. Synthesis and applications. The native‐dominated and partially invaded forests still hold conservation value, despite variation among sites. Seedling additions could be targeted to different R:FR environments and at different spatial scales, but the lack of a strong relationship between R:FR and seedling number suggests that other factors besides light quality should be considered in seedling enrichment or other management activities.
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来源期刊
Journal of Applied Ecology
Journal of Applied Ecology 环境科学-生态学
CiteScore
9.80
自引率
3.50%
发文量
229
审稿时长
4.5 months
期刊介绍: Journal of Applied Ecology publishes novel, high-impact papers on the interface between ecological science and the management of biological resources.The editors encourage contributions that use applied ecological problems to test and develop basic theory, although there must be clear potential for impact on the management of the environment.
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