生态环境学报 ›› 2022, Vol. 31 ›› Issue (5): 865-874.DOI: 10.16258/j.cnki.1674-5906.2022.05.002

• 研究论文 • 上一篇    下一篇

喀斯特不同地下生境剖面植物根系拓扑结构特征

符裕红1(), 张代杰2, 项蛟1, 周焱1, 黄宗胜3,*(), 喻理飞4   

  1. 1.贵州师范学院生物科学学院,贵阳 贵州 550018
    2.贵州省贵阳市花溪区水利局,贵阳 贵州 550025
    3.贵州大学建筑与城市规划学院,贵阳 贵州 550025
    4.贵州大学生命科学学院,贵阳 贵州 550025
  • 收稿日期:2021-05-16 出版日期:2022-05-18 发布日期:2022-07-12
  • 通讯作者: * 黄宗胜(1972年生),男,教授,博士,主要从事景观生态方面的研究。E-mail: 527690165@qq.com
  • 作者简介:符裕红(1982年生),女,副教授,博士,主要从事生态恢复方面的研究。E-mail: 53813350@qq.com
  • 基金资助:
    贵州省自然科学基金项目(黔科合基础[2019]1251号);国家自然科学基金项目(31560187);国家自然科学基金项目(51868008);贵州省教育厅项目(教高厅函[2019]46号)

Topological Structure of Plant Roots of Different Underground Habitat Profiles in Karst Areas

FU Yuhong1(), ZHANG Daijie2, XIANG Jiao1, ZHOU Yan1, HUANG Zongsheng3,*(), YU Lifei4   

  1. 1. Biological sciences college of Guizhou normal university, Guiyang 550018, P. R. China
    2. Huaxi bureau of water resources in Guiyang of Guizhou, Guizhou 550025, P. R. China
    3. College of Architecture and Urban Planning of Guizhou University, Guizhou 550025, P. R. China
    4. College of life science of Guizhou University, Guizhou 550025, P. R. China
  • Received:2021-05-16 Online:2022-05-18 Published:2022-07-12

摘要:

喀斯特生境高度异质,根系分布复杂,为揭示喀斯特地下生境植物根系分布特征,明确地下生境剖面植物根系拓扑结构,探索喀斯特地区植物与生境的适应机制,为喀斯特石漠化区植物生长研究、树种选择和植被恢复技术提供依据和指导。以地下生境类型及其根系分布特征为主线,在贵州区域范围内开展野外剖面调查,涉及39个区域共152个剖面样点,创新性地结合AutoCAD软件技术分析不同剖面生境的基本特征、植物根系的分布特点、根系拓扑构型特征等,探讨不同生境特征与根系拓扑特征间的关系,分析不同地下生境类型植物根系拓扑结构特征的异同。结果表明,(1)喀斯特植物根系分布与地下生境特征存在相互影响,岩石破碎度指数、土层深度、裂缝宽度、根系分布宽度、岩石斑块数、根系分布长度是导致生境类型差异性的重要表现因素。(2)通过生境指标及植物根系拓扑参数分类,剖面生境可划分为:表层空间类型、单层空间类型,多层空间类型,且多层空间类型数量最多;结合岩石类型和植被类型细分,将表层空间类型细分为2类,单层空间类型细分为4类,多层空间类型细分为4类。(3)喀斯特地下空间类型影响植物根系分布,并受岩石裂隙控制,多层空间中表现更为明显,乔木树种根系分布更为突出。(4)不同生境类型植物根系分支相对复杂,次级分支相对较多,植物根系的分叉分级受制于生境结构,根系拓扑指数范围为0.54—0.77,叉状型分布占66.78%,鱼尾型分布占33.22%,叉状型分支更占优势,植物主要采取多方向分支扩展的觅食性策略适应特殊生境。

关键词: 喀斯特区, 地下生境, 植物根系, 拓扑结构, 适应性

Abstract:

Karst habitats are highly heterogeneous, with complex root distribution. In order to provide a basis and guidance for plant growth research, tree species selection, and vegetation restoration technology in Karst rocky desertification areas, this study plans to reveal the distribution characteristics and topological structure of plant roots in underground habitat, and explore the adaptation mechanism between plants and habitats in Karst areas. Based on the underground habitat types and root distribution characteristics, field profile survey was carried out, involving 152 profile samples of 39 regions in Guizhou province. The habitat characteristics, plant roots distribution, and root topological structure of different profile habitats were analyzed by AutoCAD innovatively; the relationship between different habitats characteristics and root topological structure was discussed; the similarities and differences of root topological structures of different underground habitats were analyzed. The results showed that (1) the plant root distribution of Karst areas and the underground habitat characteristics had mutual effects, and the rock fragmentation index, soil depth, crack width, root distribution width, number of rock patches, and root distribution length were the important factors leading to the differences among habitat types. (2) The profile habitats were divided into 3 major types according to the classification of the habitat indexes and the topological parameters of plant roots: the surface space type, the single-layer space type, and the multi-layer space type. Among them, the number of multi-layer space type was the highest. Coupled with the types of rock and vegetation, the surface space type can be divided into 2 types, single-layer space type can be divided into 4 types, and multi-layer space type can be divided into 4 types. (3) The distribution of plant roots was affected by the type of underground space, and controlled by rock fissures. The effect was more evident in multi-layer space, and the root distribution of tree species is more prominent. (4) The root branches of plants of different habitats were relatively complex, and there were more secondary branches. The bifurcation classification of plant roots was controlled by the habitat structure. The root topological index ranged from 0.54 to 0.77, where 66.78% were fork type, 33.22% were fish tail type, and the fork branch was more dominant. The foraging strategy of branching in multiple directions was adapted to the special habitats.

Key words: Karst areas, underground habitat, plant roots, topological structure, adaption

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