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热带岩溶森林内露石表面微生境及其殖居植物 |
兰亚1,2,郭艺博1,2,袁闯1,2,沈有信1,2*
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1. 中国科学院西双版纳热带植物园,云南 勐仑 666303;2. 中国科学院大学,北京 100049
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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。该文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,并调查其上殖居植物的组成情况,采用Pearson相关性分析及冗余分析(RDA)来揭示露石微生境特征及环境因子对殖居植物的影响。结果表明:(1)热带岩溶森林中露石微生境的土深(4.92±4.00)cm、面积(532.28±1575.10)cm2等特征值变异性较大。(2)微生境中共调查到44科82属90种1518株乔、灌、草植物,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)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。综上所述,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: |
基金项目:国家自然科学基金项目(32101380) |
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Microhabitats and their colonized plants on rock outcrops surface in a tropical karst forest |
LAN Ya1,2,GUO Yibo1,2,YUAN Chuang1,2,SHEN Youxin1,2*
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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 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 rock outcrops microhabitats. And 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 are as follows: (1) In tropical karst forest, the microhabitat characteristic such as soil depth (4.92±4.00 )cm and area (532.28±1575.10 )cm2 have great variability. (2) A total of 1518 individuals of 90 species belonging to 82 genera and 44 families were recorded in all microhabitats, and karst preferent species that dominants on limestone accounted for 35.6%. (3) The area size and soil depth of microhabitat can explain more than 70% of the species composition and colonized plants richness in the RDA model. (4) The species-area relationship between the richness of the colonized plants and the area of rock outcrops microhabitats shows 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, rocky outcrop, microhabitat, habitat heterogeneity, karst characteristic species, species-area relationship |