| 摘要: |
| 露石是岩溶生态系统的一个典型特征物,其上发育着多样的微生境并殖居着多样的植物,但殖居植物与微生境之间的关系尚不清楚。该研究以西双版纳的一片发育在石灰山上的热带季节性湿润林为研究对象,测量586个露石微生境的自身特征与外界环境因子,并调查其殖居维管束植物的物种组成情况,采用Pearson相关性分析与冗余分析(RDA)来揭示露石微生境特征和环境因子与维管束植物丰富度之间的关系。结果表明:(1)热带岩溶森林中露石微生境的体积(5 148.33±31 501.92)cm3、面积(532.28±1 575.10)cm2等特征值的变异性较大。(2)微生境中共调查到44科82属90种1 518株乔木、灌木和草木植物,其中在岩溶基质中具有优势的适宜种占总物种数的35.6%。(3)RDA模型表明微生境的面积与土深对殖居植物物种组成及丰富度的解释度大于70%。(4)露石微生境内的殖居植物物种丰富度与面积之间存在明显的递衰指数型种-面积关系。综上认为,热带岩溶森林内露石表面微生境存在高度异质性,面积和土深是影响植物殖居的关键因子,种-面积关系主导了露石表面微生境的物种丰富度格局。 |
| 关键词: 岩溶, 露石, 微生境, 生境异质性, 岩溶特征种, 种-面积关系 |
| DOI：10.11931/guihaia.gxzw202402004 |
| 分类号:Q948 |
| 文章编号:1000-3142(2025)03-0606-13 |
| Fund project:第一作者: 赵文慧(2000—),硕士研究生,主要从事中药分析和体内代谢研究,(E-mail)zhaowenhui0222@163.com。 |
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| Microhabitats and their colonized plants on rock outcrop surfaces in tropical karst forest |
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LAN Ya1,2, GUO Yibo1,2, YUAN Chuang1,2, SHEN Youxin1,2*
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1. Xishuangbanna Tropical Botanical Garden of Chinese Academy of Sciences, Menglun 666303, Yunnan,
China;2. University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| Rock outcrop is a typical feature of karst ecosystem, on which there are complex microhabitats and various colonized plants, but the relationship between these colonized plants and microhabitats is not clear. Taking a tropical seasonal humid forest in Xishuangbanna as the research object in this study, we measured the morphological characteristics and external environmental factors of 586 microhabitats on rock outcrops surface. All colonized vascular species on these microhabitats were identified and counted. Then, Pearson correlation analysis and redundancy analysis(RDA)were used to reveal the relationship between microhabitats(including morphological characteristics and environmental factors)and vascular plants richness. The results were as follows:(1)In tropical karst forest, the microhabitat characteristic such as volume [(5 148.33±31 501.92)cm3] and area [(532.28±1 575.10)cm2] had great variability.(2)A total of 1 518 trees, shrubs and herbs of 90 species belonging to 82 genera and 44 families were recorded in all microhabitats, and preferential species that dominants on karst limestone accounted for 35.6%.(3)The area size and soil depth of microhabitat could explain more than 70% of species composition and colonized plants richness in RDA model.(4)The species-area relationship between the richness of the colonized plants and the area of rock outcrop microhabitats showed an obvious exponential decay. In conclusion, microhabitats on rock outcrops in the tropical karst forest is highly heterogeneous, the area size and soil depth are the key factors affecting plant colonization, and the species-area relationship dominates the species richness pattern on rock outcrops microhabitats. |
| Key words: karst, rock outcrop, microhabitat, habitat heterogeneity, karst characteristic species, species-area relationship |
