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在气候变化下,水资源的限制改变了大西洋森林季节性森林的种子库特征和生态

Patrícia Borges Dias¹, Sustanis Horn Kunz¹, José Eduardo Macedo Pezzopane¹

¹Department of Forestry and Wood Sciences, Universidade Federal do Espírito Santo, Jerônimo Monteiro, Espírito Santo, Brazil.

Global change biology

|September 7, 2024

概括

未来的气候变化,特别是水资源限制,威胁着对森林永存至关重要的土壤种子银行 (SSB). 预计的干旱严重影响季节性热带森林的种子发芽和森林再生潜力.

科学领域:

生态生态学生态生态学
气候变化生物学气候变化生物学
森林科学森林科学森林科学

背景情况:

土壤种子银行 (SSB) 对于森林延续至关重要,特别是在季节性热带森林中.
了解SSB对预计气候变化的反应,特别是改变水的可用性,至关重要,但研究不足.

研究的目的:

在未来的气候场景下评估SSB的发芽,生态属性和功能特征.
评估水限制和温度升高对季节性森林中SSB弹性的影响.

主要方法:

从大西洋森林季节性森林的12个地块收集了48个SSB样本.
在受控温室中,样本暴露在两个场景 (当前和RCP8.5) 中,有两个水位 (受限制和不受限制).
分析了发芽物识别,生态属性,功能特征,叶面积,生物质,丰富性,丰富性和多样性.

主要成果:

在未来的水限制下,生态属性和功能特征显著下降 (RCP8.5_WR).
未来情景中的温度升高增加了水的消耗.
在未来的场景中,水的稀缺性对财富和丰富性产生了不利影响,表明对干旱的容忍度较低.

结论:

在未来的气候场景中,持续的水资源限制可能会通过阻碍种子发芽来破坏季节性森林的弹性.
预计的气候变化影响,特别是干旱,可能导致SSB再生潜力丧失并改变森林结构.
SSB对预计的长期干旱具有较低的耐受性,威胁到未来的森林再生.

关键词:

大西洋森林大西洋森林大西洋森林.二氧化碳的增加二氧化碳的增加生物质生产率生物质的生产率.气候危机气候危机气候危机生态系统的弹性生态系统的弹性缓解行动是缓解行动.苗木的出现苗木的出现

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