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| 云南喀斯特退化天坑木本植物功能性状变异特征及适应策略 | |
| 引用本文： | 税伟,郭平平,朱粟锋,冯洁,孙祥,李慧.云南喀斯特退化天坑木本植物功能性状变异特征及适应策略[J].地理科学,2022,42(7):1295-1306. |
| 作者姓名： | 税伟 郭平平 朱粟锋 冯洁 孙祥 李慧 |
| 作者单位： | 1.福州大学地理科学与规划系，福建 福州 350116 2.厦门大学环境与生态学院，福建 厦门 361102 |
| 基金项目： | 国家自然科学基金项目(41871198) |
| 摘 要： | 以云南省沾益自然保护区内典型而宏大的喀斯特中度退化天坑——深陷塘为例，分析了该天坑地下森林的34种木本植物的8个功能性状的变异程度，并从种内和种间水平进一步探究功能性状变异与科类群、生活型、生长型和生态因子的关系及土壤因子对植物性状变异的解释效应。结果表明：天坑地下森林内分布的木本植物具有叶厚度大、比叶面积较小、叶干物质含量较高的特点；灌木植物性状种间变异普遍小于乔木，植物性状变异程度在常绿和落叶间相差不大，大部分叶性状的种内种间变异大于小枝性状；天坑内植物性状的平均种内变异系数达23.45%，相较于其他非喀斯特区域的植被类型，其性状种内变异幅度较低，表明喀斯特天坑区域的植物具有较小的形态可塑性；土壤养分是决定样地尺度上群落性状变异的主导环境因素，但物种系统发育历史及其生活史特性也是该地带性植被功能性状变异的内生动力。综上，表明天坑地下森林的木本植物物种在长期演化过程中，其功能性状及其变异程度受非生物环境因素、系统发育过程、生活史策略等的综合影响。研究结果可为负地形的喀斯特天坑的物种避难所价值提供材料和证据，为提升云南高原喀斯特生态脆弱区和自然保护区生态系统服务功能、科学开展天坑外部区域和地带性植被的生态恢复工作提供科学支撑。 |
| 关 键 词： | 喀斯特天坑 植物功能性状 种内变异 种间变异 |
| 收稿时间： | 2021-12-06 |
| 修稿时间： | 2022-05-20 |
Variation of Plant Functional Traits and Adaptive Strategy of Woody Species in Degraded Karst Tiankeng of Yunnan Province |
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| Shui Wei,Guo Pingping,Zhu Sufeng,Feng Jie,Sun Xiang,Li Hui.Variation of Plant Functional Traits and Adaptive Strategy of Woody Species in Degraded Karst Tiankeng of Yunnan Province[J].Scientia Geographica Sinica,2022,42(7):1295-1306. | |
| Authors: | Shui Wei Guo Pingping Zhu Sufeng Feng Jie Sun Xiang Li Hui |
| Institution: | 1. Department of Geography and Planning, Fuzhou University, Fuzhou 350116, Fujian, China 2. College of the Environment and Ecology, Xiamen University, Xiamen 361102, Fujian, China |
| Abstract: | In the context of global climate change, habitat adaptation studies of the karst tiankeng plants are gradually being highlighting. However, it is unclear what ecological strategies plants adopt to acclimate to tiankeng microhabitat, and how plant life history, genetic history, and ecological factors contribute to functional trait variation. Therefore, we analyzed the degree of variation of 8 functional traits from 34 woody species in a typical moderate-degraded Shenxiantang Tiankeng of Zhanyi Nature Reserve of Yunnan Province. The relationship between functional trait variation and family group, life type, growth type and ecological factors and the explanatory effect of soil factors on plant trait variation were further explored at intraspecific and interaspecific levels. Our results showed that the characteristics of woody species from tiankeng underground forest were large leaf thickness, small specific leaf area and large leaf dry matter content. Interspecific variation of plant traits in shrubs was generally smaller than that of trees, and the degree of variation of plant traits did not significantly difference between evergreen and deciduous tree species. The majority of intraspecific and interspecific variation of leaf traits was greater than that of branchlet traits. The average intraspecific variation coefficient of plant traits in the Shenxiantang Tiankeng amounted to 23.45%, which was lower compared to the vegetation types in other non-karst regions. It indicated that plants had less shape plasticity under the karst tiankeng regions. Soil nutrients were the dominant environmental factor which determined the variability of community traits at the sample site scale. Moreover, the phylogenetic history of species and their life history characteristics were also internal drivers of functional trait variation in this zonal vegetation. In conclusion, during the long-term evolution of species, the functional traits and their degree of variability were influenced by a combination of non-biological environmental factors, phylogenetic processes, and life history strategies. This study aims to provide materials and evidence for the value of species refuges in karst tiankengs with negative topography, and to contribute scientific support for enhancing the ecosystem service functions of karst ecologically vulnerable areas and nature reserves in Yunnan Plateau, and for scientifically undertaking ecological restoration of tiankeng external areas and zonal vegetation. |
| Keywords: | karst tiankeng functional trait of vegetation intraspecific variation interspecific variation |
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