摘要
林窗是森林更新演替的重要环节,揭示林窗环境下功能性状变异来源及其相对贡献,有助于阐明植物对林窗环境的响应。该研究以中亚热带格氏栲(Castanopsis kawakamii)天然林为对象,设置9个不同大小的林窗样地,运用方差分解探讨林窗、物种和个体对叶性状变异的相对贡献,采用线性回归分析不同大小林窗下群落性状变化及种间和种内性状变异的重要性。研究发现:(1)格氏栲天然林林窗植物比叶面积、叶干物质含量、叶厚和叶绿素含量由种间性状变异主导,叶氮含量由种内性状变异主导,叶磷含量受林窗大小影响最大。(2)群落叶磷含量与林窗大小具有显著正相关关系,土壤温度和水解氮含量对群落叶磷含量具有显著正效应,土壤有效磷含量具有显著负效应。(3)沿林冠开放度的群落叶磷含量变化主要由种内性状变异引起,优势种扮演着重要角色。结果表明,格氏栲天然林林窗环境下植物功能性状仍以种间性状变异为主(平均41%),但沿林窗环境梯度的群落性状变化主要源自种内性状变异,通过植物表型可塑性响应环境改变,优势种作用明显。
Aims Canopy gaps are a vital part of forest regeneration and succession. This paper aims to reveal the sources of functional trait variations and their relative contributions under forest canopy gaps. This will help to clarify the response of the plants to canopy gaps. Methods The study was conducted in a natural forest of Castanopsis kawakamii in the central subtropical zone. Nine permanent plots with different sizes were set up under canopy gaps of this forest. The relative contributions of the gaps, species, and individuals to leaf trait variations were investigated using variance decomposition. Linear regression was used to analyze the importance of community mean trait variation and inter-and intraspecific trait variation among the different sizes of canopy gaps. Important findings The variations of specific leaf area, leaf dry matter content, leaf thickness, and chlorophyll content of plants under canopy gaps were dominated by interspecific trait differences. Leaf nitrogen content was mainly varied within species, while the leaf phosphorus content was most affected by the size of canopy gap. The leaf phosphorus content had a significant positive correlation with gap size. This correlation may be mediated by the positive effect of soil temperature and hydrolyzed nitrogen and the negative effect of available phosphorus content. With the increase of canopy openness, the change of community phosphorus content was mainly caused by intraspecific trait variation, in which the dominant species played an important role. In conclusion, plant functional traits were still dominated by interspecific trait variation(41% on average) in the Castanopsis kawakamii natural forest, but the changes in community traits along the gap size gradients were mainly originated from intraspecific trait variation, which responded to the environmental changes through plant phenotypic plasticity, especially for dominant species.
作者
江蓝
魏晨思
何中声
朱静
邢聪
王雪琳
刘金福
沈彩霞
施友文
JIANG Lan;WEI Chen-Si;HE Zhong-Sheng;ZHU Jing;XING Cong;WANG Xue-Lin;LIU Jin-Fu;SHEN Cai-Xia;SHI You-Wen(College of Forestry,Cross-Strait Nature Reserve Research Center,Key Laboratory of Fujian Universities for Ecology and Resources Statistics,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Administration Station of Castanopsis kawakamii Nature Reserve in Xinkou of Sanming,Sanming,Fujian 365000,China;Forest Inventory and Planning Institute of Fujian Province,Fuzhou 350003,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2022年第3期267-279,共13页
Chinese Journal of Plant Ecology
基金
国家自然科学基金(31700550)
福建省自然科学基金(2019J01367)。
关键词
性状变异
林窗大小
种间性状变异
种内性状变异
群落性状
trait variation
gap size
interspecific variation
intraspecific variation
community trait
