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木棉树形结构和叶性状对生境要素的响应研究 |
毛开泽1,高漫娟1,吴睿1,张月萍1,程希平1,2
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1. 西南林业大学地理与生态旅游学院,昆明,650224; 2. 国家林业和草原局西南生态文明研究中心,昆明,650224
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摘要: |
植物形态结构是植物本身与外部环境共同作用的结果,分析木棉树形结构与叶性状的相关关系,探索地形、土壤和气象要素对木棉生长的影响,对揭示木棉生长策略和适应机制具有重要意义。以云南省西双版纳国家级自然保护区内230棵木棉为研究对象,测定6个树形结构指标,8个叶性状指标以及所在区域地形、气象、土壤养分等生境要素,使用结构方程模型和变差分解分析各生境要素对木棉树形结构和叶性状的影响和解释度。结果表明:(1)木棉树形结构各观测指标之间、叶性状各观测指标之间存在相关性(P<0.05)。(2)生境要素各观测指标对木棉生长具有较强影响,其中年均降雨量、坡度、平均温度对木棉生长指标的解释率较高,是影响木棉生长的主要生境指标。(3)从标准化路径系数看,三个生境要素对木棉树形结构和叶性状影响具有一致性,均表现为地形要素>气象要素>土壤要素。(4)三个生境要素叠加解释了树形结构和叶性状分别为43.5%和12.3%,表现出树形结构对生境环境的响应大于叶性状对环境响应的特点。研究结果初步探明了木棉不同生长指标对环境的要素的适应策略,可为木棉在异质生境的培育、繁殖以及木棉人工林高效经营等提供理论依据和实践参考。 |
关键词: 木棉,生境要素,树形结构,叶性状,冗余分析,结构方程模型 |
DOI:10.11931/guihaia.gxzw202211012 |
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基金项目:国家自然科学(31860206) |
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The study of Bombax ceiba Linnaeus tree structure and leaf traits response to habitat elements |
MAO Kaize1, GAO Manjuan1, WU Rui1, ZHANG Yueping1, CHENG Xiping1,2*
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School of Geography and Ecotourism, Southwest Forestry University, Kunming 650224, China; 2. Southwest Research Center for Eco-civilization, National Forestry and Grassland Administration, Kunming 650224, China
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Abstract: |
The plant’s morphology and structure results from the joint action of itself and the external environment. In this study, we analyzed the correlation between the tree structure and leaf traits of Bombax ceiba Linnaeus, and explored the influence of topographic, soil, and meteorological elements on the growth of B. ceiba. It is of great significance to reveal the growth strategy and adaptation mechanism of B. ceiba. Therefore, we researched 230 B. ceiba trees in Xishuangbanna National Nature Reserve of Yunnan Province and measured six tree structure indexes, eight leaf traits indexes, and habitat elements of regional topographic, meteorology, and soil. The effects and explantation of habitat elements on the tree structure and leaf traits of B. ceiba were analyzed by structural equation model and variation decomposition. The results showed that: (1) There were correlations among the indices of tree structure and among the indices of leaf traits (P < 0.05). (2) The observed indices of habitat factors had a strong influence on the growth indices of B. ceiba leaves. The mean annual precipitation, slope and average temperature had a higher interpretation rate on the growth indices of B. ceiba leaves, and were the dominant habitat indices affecting the growth of B. ceiba. (3) According to the standardized path coefficient, the three habitat factors had the same effect on the tree structure and leaf traits of B. ceiba, and all of them were in the order of topographic elements>meteorological elements>soil elements. (4) The superposition of the three habitat elements explained that tree structure and leaf traits were 43.5% and 12.3%, respectively, indicating that the response of tree structure to the habitat environment was greater than that of leaf traits to the environment. The results of this study preliminarily explores the adaptation strategies of different growth indexes to environmental factors of B. ceiba, which could provide theoretical basis and practical reference for the cultivation and propagation of B. ceiba in heterogeneous habitats and efficient management of Bombax ceiba Linnaeus plantation. |
Key words: Bombax ceiba, habitat elements, tree structure, leaf traits, redundancy analysis, structural equation model |