川西林线交错带岷江冷杉幼苗异龄叶形态对长期模拟增温的响应

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 川西林线交错带岷江冷杉幼苗异龄叶形态对长期模拟增温的响应 DOI: 10.5846/stxb201708031393 作者: 作者单位: 四川农业大学,旺苍县林业和园林局,河南大学生命科学学院,甘肃农业大学林学院,四川农业大学 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（31670477） Long-term warming effects on leaf traits of different-aged needles of Abies faxoniana seedlings in a treeline ecotone in western Sichuan Author: Affiliation: Sichuan Agricultural University,,,,Sichuan Agricultural University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:全球气候变暖对高纬度、高海拔地区的植物形态产生强烈影响。川西林线交错带是青藏高原东部高寒生态系统的重要组成部分，对全球变化极度敏感。以川西林线交错带岷江冷杉（Abies faxoniana）幼苗异龄叶为对象，采用原位开顶式生长室（Open-top chamber，OTCs）模拟增温，研究了长期模拟增温下岷江冷杉幼苗异龄叶片叶长、叶厚等叶形态的响应，采用表型可塑性指数和变异系数对叶形态的可塑性进行分析。结果表明：增温限制岷江冷杉幼苗叶片的增长、增宽和叶面积、体积的扩大，使叶长、叶宽、叶面积、叶体积分别较对照减小12.77%、11.86%、17.76%、11.49%；增温促进叶片厚度的增加，较对照增加7.27%；除叶长宽比外，增温对其余叶形态均产生显著影响（P < 0.05）。叶形态对模拟增温的响应具有显著的年龄差异（P < 0.05）。温度、叶龄的交互效应对叶长和叶面积影响显著（P < 0.05），对叶宽和叶厚影响不显著（P > 0.05）。两种表型可塑性分析结果表明，除1 a叶叶长外，增温不同程度增大各叶形态可塑性。长期增温使冷杉幼苗叶片有旱生倾向且形态值更发散。研究提供了岷江冷杉幼苗叶片对长期增温的差异性响应证据，为评估青藏高原东缘优势植物对响应气候变暖提供了基础数据和理论参考。 Abstract:Global warming has a strong effect on plant traits at high latitudes and high altitudes. To explore plant adaptability to global warming, more ecologists focus on the responses of leaf traits to warming, because the leaf is the key photosynthetic organs and sensitive to climat change. Previous studies have proved that warming directly influenced the plant leaf area, leaf life, phenology, and lateral growth. More evidence has shown that the responses of leaf traits to warming is highly species-specific. However, none of these studies included specific leaf traits or focused on the effects of long-term warming. In generally, different leaf traits respond differently to simulated warming, and these provide insights into how key plant speceis adapt to climate change. Abies faxoniana is one of the important woody species in subalpine coniferous forests. Could A. faxoniana expand to a higher altitude region (e.g. treeline ecotone) in the future climate warming scenario? Therefore, we used in situ open-top chambers to simulate warming and study the long-term effects of warming on leaf traits (leaf length, leaf width,and leaf thickness) and leaf plasticity at different ages (annual, biennial, and triennial) of A. faxoniana seedlings. The goals of this study were to determine how A. faxoniana changed their leaf traits and corresponding plasticity under simulated warming conditions.The results showed that simulated warming had a negative effect on the length, width, volume, and area of needles (reduced 12.77%, 11.86%, 11.49%, and 17.76%, respectively), whereas simulated warming had a positive effect on leaf thickness (increased 7.27%, P < 0.05). The responses of leaf traits to simulated warming had a significant differences in the age (P < 0.05). Combined the effects of simulated warming and leaf age, leaf length, and leaf area had been changed significantly (P < 0.05), whereas the reponses of leaf width and leaf thickness to simulated waming were the opposite. Phenotypic plasticity index (PPI) and coefficient of variation (CV) showed that simulated warming promoted the plasticity of leaf traits, leaf length of the annual leaves excepted. However, there were significant inter-annual differences in the effects of warming on leaves of different ages. In summary, the present study suggests that A. faxoniana seedlings leaves could adapt to global warming via regulating leaf traits to enhance its plasticity. 参考文献 相似文献 引证文献