Intense light and conspecific density increase seedling mortality across age groups in a typhoon-disturbed tropical forest

IF 2.2 3区环境科学与生态学 Q2 ECOLOGY

Journal of Vegetation Science Pub Date : 2024-10-12 DOI:10.1111/jvs.13309

Yung-Chiau Lin, Kuo-Jung Chao, Guo-Zhang M. Song, Wei-Chun Chao, Chia-Hao Chang-Yang, Chang-Fu Hsieh

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引用次数: 0

Abstract

Questions

Maintaining forest species diversity, regenerative function and ecosystem resilience begins with successful seedling establishment. Despite their critical role, seedlings face the highest mortality risks among plant life-history stages. Our research aims to answer the following questions: In a tropical forest disturbed by typhoons, what is the median survival time for seedlings, to what extent do light levels contribute to mortality risks and what are the crucial mortality risks across seedling age groups?

Location

A tropical mountain zonal foothill evergreen broad-leaved forest in Nanjenshan Nature Reserve, Taiwan, frequently visited by typhoons.

Methods

We investigated woody seedlings in 75 quadrats (each 1 m × 1 m) every 3 months from October 2009 to January 2018, spanning 8.3 years with 34 censuses. We used the Kaplan–Meier method to estimate seedlings’ median survival time and Generalized Linear Models to identify mortality risk factors for all seedlings and those that persisted beyond the median survival time.

Results

The median survival time for all seedlings was 0.5 years, ranging from 0.25 years for shade-intolerant species to 1.25 years for shade-tolerant species. Seedlings germinated in high-light microhabitats and high conspecific seedling density exhibited higher mortality probabilities, regardless of age.

Conclusions

This study reveals the short survival time and key mortality risks of seedlings in a typhoon-disturbed forest. The negative impact of light levels on seedling survival highlights the potential consequences of increased light levels resulting from typhoon disturbances in the study region.

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在受台风干扰的热带森林中，强光和同种密度增加了各年龄组幼苗的死亡率

问题保持森林物种多样性、再生功能和生态系统恢复力始于成功培育幼苗。尽管幼苗起着至关重要的作用，但在植物的生命史阶段中，幼苗面临的死亡风险最高。我们的研究旨在回答以下问题：在受台风干扰的热带森林中，幼苗的中位存活时间是多长？光照水平在多大程度上会导致幼苗死亡？地点台湾南尖山自然保护区的热带山地带麓常绿阔叶林，台风经常光顾。方法我们在 2009 年 10 月至 2018 年 1 月期间，每隔 3 个月对 75 个四分区（每个 1 m × 1 m）中的木本幼苗进行了调查，历时 8.3 年，共进行了 34 次普查。我们使用卡普兰-梅耶法估算幼苗的中位存活时间，并使用广义线性模型确定所有幼苗和存活时间超过中位存活时间的幼苗的死亡风险因素。结果所有幼苗的中位存活时间为 0.5 年，不耐阴物种为 0.25 年，耐阴物种为 1.25 年。在高光照微生境和高同种幼苗密度下发芽的幼苗，无论年龄大小，都表现出较高的死亡率。结论这项研究揭示了幼苗在受台风侵扰的森林中存活时间短和主要的死亡风险。光照度对幼苗存活率的负面影响凸显了台风干扰对研究区域光照度增加的潜在影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Vegetation Science 环境科学-林学

CiteScore

6.00

自引率

3.60%

发文量

审稿时长

2 months

期刊介绍： The Journal of Vegetation Science publishes papers on all aspects of plant community ecology, with particular emphasis on papers that develop new concepts or methods, test theory, identify general patterns, or that are otherwise likely to interest a broad international readership. Papers may focus on any aspect of vegetation science, e.g. community structure (including community assembly and plant functional types), biodiversity (including species richness and composition), spatial patterns (including plant geography and landscape ecology), temporal changes (including demography, community dynamics and palaeoecology) and processes (including ecophysiology), provided the focus is on increasing our understanding of plant communities. The Journal publishes papers on the ecology of a single species only if it plays a key role in structuring plant communities. Papers that apply ecological concepts, theories and methods to the vegetation management, conservation and restoration, and papers on vegetation survey should be directed to our associate journal, Applied Vegetation Science journal.