| 引用本文: | 孙 鹏, 韦 霄, 叶万辉, 沈 浩.南亚热带常绿阔叶林冠层和林下层优势种叶功能性状响应异质生境的差异[J].广西植物,2022,42(3):510-519.[点击复制] |
| SUN Peng, WEI Xiao, YE Wanhui, SHEN Hao.Bhesa robusta sapling in different habitats[J].Guihaia,2022,42(3):510-519.[点击复制] |
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| 南亚热带常绿阔叶林冠层和林下层优势种叶功能性状响应异质生境的差异 |
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孙 鹏1,3,4, 韦 霄2, 叶万辉1,3,4, 沈 浩1,3,4*
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1. 中国科学院退化生态系统植被恢复与管理重点实验室, 中国科学院华南植物园, 广州 510650;2. 广西壮族自治区
中国科学院 广西植物研究所, 广西 桂林541006);3. 南方海洋科学与工程广东省实验室(广州),
广州 511458;4. 中国科学院大学 资源与环境学院, 北京 100049
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| 摘要: |
| 植物可以通过改变功能性状适应环境变化,不同类型的植物如何调整表型来适应环境一直是生态学研究的热点。为探究南亚热带森林不同生长型植物对异质生境的生态响应机制,该研究沿广东鼎湖山南亚热带常绿阔叶林20 hm2样地的3条山体选取不同海拔和凹凸度的27个样方(20 m × 20 m)中的5种优势树种(包括2种冠层树种和3种林下层树种),测定每株树的胸径及8种叶功能性状,包括4种结构性状(叶片厚度、长宽比、干物质含量和比叶面积)和4种化学计量性状( SymboldA@ 13C、 SymboldA@ 15N、叶片氮含量和叶片磷含量),从叶功能性状角度对比分析两种生长型的优势树种响应海拔和凹凸度等异质生境的差异。结果表明:(1)各树种均存在若干叶功能性状与海拔呈现显著相关关系; 在凹凸度方面,仅有厚壳桂的比叶面积与凹凸度呈现正相关,柏拉木的叶片氮含量与凹凸度呈现负相关。(2)比叶面积、叶片厚度与 SymboldA@ 15N等性状更普遍地对海拔因素存在响应,而叶长宽比和叶干物质含量响应程度较低。(3)冠层与林下层优势种比叶面积、叶干物质含量和叶片氮含量在各类生境中均存在显著差异; 相较冠层树种而言,林下层树种有着相对较低的叶片厚度、叶干物质含量和 SymboldA@ 13C; 冠层和林下层树种的叶功能性状对海拔和凹凸度的响应程度不同,林下层树种具有更多的功能性状在不同类型生境下存在显著差异。综上认为,鼎湖山南亚热带常绿阔叶林不同层片的优势树种(冠层和林下层优势树种)对异质生境的响应程度存在较大差异,表现在林下层树种在异质生境中表型更易随环境变化以适应更多样的环境条件,比叶面积、叶片厚度与 SymboldA@ 15N等是指示南亚热带常绿阔叶林树种响应异质生境的重要且有效的性状。 |
| 关键词: 功能性状, 冠层树种, 林下层树种, 海拔梯度, 地形因素 |
| DOI：10.11931/guihaia.gxzw202103029 |
| 分类号:Q948.15 |
| 文章编号:1000-3142(2022)03-0510-10 |
| 基金项目:国家自然科学基金(31370446); 南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0408); 广东省林业科技创新项目(2017KJCX036, 2019KJCX015); 广东省科技计划项目(2017A020217001)[Supported by National Natural Science Foundation of China(31370446); Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0408); Guangdong Forestry Science and Technology Innovation Project(2017KJCX036, 2019KJCX015); Science and Technology Planning Project of Guangdong Province, China(2017A020217001)]。 |
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| Bhesa robusta sapling in different habitats |
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SUN Peng1,3,4, WEI Xiao2, YE Wanhui1,3,4, SHEN Hao1,3,4*
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1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences,
Guangzhou 510650, China;2. Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin
541006, Guangxi, China;3. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 511458,
China;4. School of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences,
Guangzhou 510650, China; 2. Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin
541006, Guangxi, China; 3. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)
, Guangzhou 511458,
China; 4. School of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| Plant species can adapt to heterogeneous habitats through variations in functional traits. For the plants with different growth forms, how to adjust their phenotypes to adapt to the environment has been one of the core topics in ecology. To clarify the response mechanisms of plant species with different growth forms to heterogeneous habitats in south subtropical forests, we measured a total of eight functional traits involving four structural traits(leaf thickness, leaf length/width ratio, leaf dry matter content and specific leaf area)and four stoichiometric traits(leaf nitrogen content, leaf phosphorus content, SymboldA@ 13C and SymboldA@ 15N)of five dominant trees(2 canopy species and 3 understory species)and their diameter at breast height, in 27 quadrats(20 m × 20 m)at different elevations and convexity along three mountain ridges within the 20 hm2 south subtropical evergreen broad-leaved forest plot at Dinghu Mountain in Guangdong Province. We analyzed and compared the differences in responses of the canopy and understory species to different elevations and convexity in terms of functional traits. The results were as follows:(1)There existed some leaf functional traits in each tree species that were significantly correlated with altitude, but for convexity, only the leaf area of Cryptocarya chinensis was positively correlated with convexity and the leaf nitrogen content of Blastus cochinchinensis was negatively correlated with convexity.(2)Specific leaf area, leaf thickness and SymboldA@ 15N were generally more responsive to elevation, while leaf length/width ratio and leaf dry matter content were less responsive.(3)There were significant differences in specific leaf area, leaf dry matter content and leaf nitrogen content between canopy and understory tree species in heterogeneous habitats. Compared with canopy tree species, understory tree species had lower leaf thickness, leaf dry matter content and SymboldA@ 13C. Moreover, canopy and understory species responded to elevation and convexity to different extents, with understory species having more functional traits with significant differences in different types of habitats. The results indicate that the degree of response to the environment varied greatly between plants with different growth forms, i.e., the dominant understory tree species had greater plasticity in the heterogeneous habitats than the dominant canopy species in the forest plot. In addition, specific leaf area, leaf thickness and SymboldA@ 15N are important and effective traits indicating plant adaptation and responses to the environment in the south subtropical evergreen broad-leaved forest. |
| Key words: functional traits, canopy species, understory species, elevation gradient, topographical factors |
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