Root and leaf traits reflect distinct resource acquisition strategies in tropical lianas and trees

被引:75
|
作者
Collins, Courtney G. [1 ]
Wright, S. Joseph [2 ]
Wurzburger, Nina [1 ]
机构
[1] Univ Georgia, Odum Sch Ecol, Athens, GA 30602 USA
[2] Smithsonian Trop Res Inst, Balboa, Ancon, Panama
关键词
Economic spectrum; Trade-offs; Mycorrhiza; Specific root length; Specific leaf area; PLANT FUNCTIONAL TRAITS; BARRO-COLORADO ISLAND; LIFE-SPAN; MYCORRHIZAL COLONIZATION; FOREST DYNAMICS; GLOBAL PATTERNS; TRADE-OFFS; GROWTH; ABUNDANCE; DENSITY;
D O I
10.1007/s00442-015-3410-7
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
In Neotropical forests, lianas are increasing in abundance relative to trees. This increased species richness may reflect a positive response to global change factors including increased temperature, atmospheric CO2, habitat fragmentation, and drought severity; however, questions remain as to the specific mechanisms facilitating the response. Previous work suggests that lianas may gain an ecological advantage over trees through leaf functional traits that offer a quick return on investment of resources, although it is unknown whether this pattern extends to root traits and relationships with fungal or bacterial symbionts belowground. We sampled confamilial pairs of liana and tree species and quantified morphological and chemical traits of leaves and fine roots, as well as root symbiont abundance, to determine whether functional traits associated with resource acquisition differed between the two. Compared to trees, lianas possessed higher specific leaf area, specific root length, root branching intensity, and root nitrogen (N) and phosphorus (P) concentrations, and lower leaf and root tissue density, leaf and root carbon (C), root diameter, root C:P and N:P, and mycorrhizal colonization. Our study provides new evidence that liana leaf and root traits are characterized by a rapid resource acquisition strategy relative to trees. These liana functional traits may facilitate their response to global change, raising questions about how increased liana dominance might affect ecosystem processes of Neotropical forests.
引用
收藏
页码:1037 / 1047
页数:11
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