亚热带27种木本植物叶片性状对植食作用的影响:验证生长-防御权衡假说  

Effects of leaf traits on herbivory across 27 woody plants in the subtropical forest:testing the growth-defense trade-off hypothesis

作　　者：王振宇 黄志群[1] WANG Zhen-Yu;HUANG Zhi-Qun(School of Geographical Science,Fujian Normal University,Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology,Fuzhou 350007,China)

机构地区：[1]福建师范大学地理科学学院,湿润亚热带山地生态国家重点实验室培育基地,福州350007

出　　处：《植物生态学报》2024年第11期1501-1509,共9页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(31930077和31600495)。

摘　　要：木本植物的植食率存在巨大的种间差异,并极大地调控着森林生态系统功能。生长-防御权衡假说认为,植物的固有生长率决定着其在防御和生长方面的投资权衡,从而影响植食率的种间变异。但生长-防御权衡假说的普适性仍然存在巨大争议,尤其在物种高度丰富的亚热带森林。该研究测量了12种与植食性昆虫适口性相关的叶片性状,并通过大样本调查植物物种的植食率,探究亚热带地区27种木本植物叶片性状的权衡关系以及这些性状对植食率和植物生长率的影响。该研究发现:1)控制性状的系统发育依赖性后,物种在空间上的排序并没有呈现一维的“生长-防御”权衡;2)缩合单宁和可溶性酚含量等化学防御性状对植食率没有显著影响;3)物种固有的生长速度与化学防御物质之间也并没有表现出权衡关系。该研究结果没有支持生长-防御权衡假说的观点,亚热带森林的植物在进化上可能同时经历环境和天敌的强烈选择,使植物表现出更加灵活的性状组合来适应复杂的生物和非生物环境。Aims Differences in herbivory among plant species can greatly affect the functioning of forest ecosystems.However,little is known about the main drivers causing interspecific differences in herbivore damage among tree species.The growth-defence trade-off hypothesis posits that the intrinsic growth rate of plant species governs resource allocation between defense and growth,thereby shaping interspecific variation in herbivory.However,the validity of this hypothesis is extensively debated,especially in highly species-rich subtropical forests.Methods We quantified leaf herbivore damage in 27 native tree species in a tree species diversity experiment conducted in subtropical China.We measured 12 leaf traits associated with insect palatability and relative growth rates of 27 tree species.Using a combination of phylogenetic multivariate analyses,we assessed trade-offs between leaf traits and the relative effect of these traits on leaf herbivore damage.Important findings We found 1)neither phylogenetic principal component analysis nor hierarchical cluster analysis supported the idea that species displayed one-dimensional trade-off;2)Conventional strategies,such as content of condensed tannins,are not strongly involved as a defence against herbivores;3)No significant trade-off between plant intrinsic growth rate and chemical defence traits for the 27 studied tree species.Our results do not support arguments for growth-defense trade-off hypothesis.Rather,plants exhibit a range of combinations of leaf traits.We suggest this lack of a one-dimensional trade-off may be adaptive,resulting from selective pressure to adopt a different combination of defences to coexisting species.

关 键 词：植物防御 生态系统功能 单宁含量 植物-昆虫互作 系统发育主成分 权衡策略 

分 类 号：Q94[生物学—植物学]