{"title":"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","authors":"Yung-Chiau Lin, Kuo-Jung Chao, Guo-Zhang M. Song, Wei-Chun Chao, Chia-Hao Chang-Yang, Chang-Fu Hsieh","doi":"10.1111/jvs.13309","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Questions</h3>\n \n <p>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?</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>A tropical mountain zonal foothill evergreen broad-leaved forest in Nanjenshan Nature Reserve, Taiwan, frequently visited by typhoons.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>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.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>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.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>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.</p>\n </section>\n </div>","PeriodicalId":49965,"journal":{"name":"Journal of Vegetation Science","volume":"35 5","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Intense light and conspecific density increase seedling mortality across age groups in a typhoon-disturbed tropical forest\",\"authors\":\"Yung-Chiau Lin, Kuo-Jung Chao, Guo-Zhang M. Song, Wei-Chun Chao, Chia-Hao Chang-Yang, Chang-Fu Hsieh\",\"doi\":\"10.1111/jvs.13309\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Questions</h3>\\n \\n <p>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?</p>\\n </section>\\n \\n <section>\\n \\n <h3> Location</h3>\\n \\n <p>A tropical mountain zonal foothill evergreen broad-leaved forest in Nanjenshan Nature Reserve, Taiwan, frequently visited by typhoons.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>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.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>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.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Conclusions</h3>\\n \\n <p>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.</p>\\n </section>\\n </div>\",\"PeriodicalId\":49965,\"journal\":{\"name\":\"Journal of Vegetation Science\",\"volume\":\"35 5\",\"pages\":\"\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-10-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Vegetation Science\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/jvs.13309\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ECOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Vegetation Science","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jvs.13309","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ECOLOGY","Score":null,"Total":0}
Intense light and conspecific density increase seedling mortality across age groups in a typhoon-disturbed tropical forest
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.
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.
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