Patterns in root trait variation among 25 co-existing North American forest species

被引:283
作者
Comas, L. H. [1 ]
Eissenstat, D. M. [1 ]
机构
[1] Penn State Univ, Dept Hort, University Pk, PA 16802 USA
基金
美国国家科学基金会;
关键词
arbuscular mycorrhiza (AM); comparative biology; ectomycorrhiza (EM); root architecture; root ecology; root morphology; specific root length (SRL); POTENTIAL GROWTH-RATE; NITROGEN; LEAF; COLONIZATION; EVOLUTION; CITRUS; PLANTS; ECTOMYCORRHIZAL; RESPIRATION; MYCORRHIZAS;
D O I
10.1111/j.1469-8137.2009.02799.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Ephemeral roots have essential roles in plant and ecosystem functioning. In forests, roots account for a major component of carbon cycling, yet few studies have examined ranges of root trait variation and how different species vary in root form and function in these communities. Root branching intensity, specific root length (SRL; root length per unit dry mass), root diameter, tissue density, phenolic concentration and nitrogen concentration were determined for the finest two root orders of 25 co-existing North American woody species sampled from mature plants in a single forest community. Trait correlations and multivariate patterns were examined to evaluate the most important trait differences among species. Branching intensity, SRL, and phenolic concentration varied most widely among species (coefficient of variation (CV) = 0.42, 0.57 and 0.58, respectively). Species predominately forming ectomycorrhiza (EM) had a higher branching intensity than those forming arbuscular mycorrhiza (AM) with mycorrhizal types correctly predicted in c. 70% of individual observations by branching intensity alone. There was notably no correlation between SRL and nitrogen. Variation in SRL among species mapped partially along phylogenetic lines (consistency index (CI) = 0.44), with remaining variation attributable to differences in species' ecological specialization. Variation found in root traits suggests different nutrient acquisition strategies within this community, which could have potential species-level effects on carbon and mineral nutrient cycling.
引用
收藏
页码:919 / 928
页数:10
相关论文
共 52 条
[21]   Anatomical traits associated with absorption and mycorrhizal colonization are linked to root branch order in twenty-three Chinese temperate tree species [J].
Guo, Dali ;
Xia, Mengxue ;
Wei, Xing ;
Chang, Wenjing ;
Liu, Ying ;
Wang, Zhengquan .
NEW PHYTOLOGIST, 2008, 180 (03) :673-683
[22]  
HARLEY J L, 1987, New Phytologist, V105, P1, DOI 10.1111/j.1469-8137.1987.tb00674.x
[23]   Rapid nitrogen transfer from ectomycorrhizal pines to adjacent ectomycorrhizal and arbuscular mycorrhizal plants in a California oak woodland [J].
He, XH ;
Bledsoe, CS ;
Zasoski, RJ ;
Southworth, D ;
Horwath, WR .
NEW PHYTOLOGIST, 2006, 170 (01) :143-151
[24]   The auxin transport inhibitor 2,3,5-triiodobenzoic acid (TIBA) inhibits the stimulation of in vitro lateral root formation and the colonization of the tap-root cortex of Norway spruce (Picea abies) seedlings by the ectomycorrhizal fungus Laccaria bicolor [J].
Karabaghli-Degron, C ;
Sotta, B ;
Bonnet, M ;
Gay, G ;
Le Tacon, F .
NEW PHYTOLOGIST, 1998, 140 (04) :723-733
[25]   Growth rate, root development and nutrient uptake of 55 plant species from the Great Plains Grasslands, USA [J].
Levang-Brilz, N ;
Biondini, ME .
PLANT ECOLOGY, 2003, 165 (01) :117-144
[26]  
LI CS, 1995, BOT J LINN SOC, V118, P163
[27]  
Oakley TH, 2000, EVOLUTION, V54, P397
[28]   GROWTH DEPRESSION IN MYCORRHIZAL CITRUS AT HIGH-PHOSPHORUS SUPPLY - ANALYSIS OF CARBON COSTS [J].
PENG, SB ;
EISSENSTAT, DM ;
GRAHAM, JH ;
WILLIAMS, K ;
HODGE, NC .
PLANT PHYSIOLOGY, 1993, 101 (03) :1063-1071
[29]  
Phillips RP, 2006, ECOLOGY, V87, P1302, DOI 10.1890/0012-9658(2006)87[1302:TSAMAI]2.0.CO
[30]  
2