Leaf hydraulic architecture correlates with regeneration irradiance in tropical rainforest trees

被引:173
作者
Sack, L
Tyree, MT
Holbrook, NM
机构
[1] Univ Hawaii Manoa, Dept Bot, Honolulu, HI 96822 USA
[2] Smithsonian Trop Res Inst, Balboa, Ancon, Panama
[3] Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA
[4] Harvard Univ, Arnold Arboretum, Jamaica Plain, MA 02130 USA
[5] USDA Forest Serv, Burlington, VT 05402 USA
关键词
Barro Colorado Island (BCI); biological networks; high pressure flowmeter (HPFM); leaf hydraulics; shade tolerance; vasculature;
D O I
10.1111/j.1469-8137.2005.01432.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
(.) The leaf hydraulic conductance ( K leaf) is a major determinant of plant water transport capacity. Here, we measured K leaf, and its basis in the resistances of leaf components, for fully illuminated leaves of five tree species that regenerate in deep shade, and five that regenerate in gaps or clearings, in Panamanian lowland tropical rainforest. We also determined coordination with stomatal characters and leaf mass per area. (.) K-leaf varied 10- fold across species, and was 3- fold higher in sun- than in shade-establishing species. On average, 12% of leaf hydraulic resistance (= 1/ K-leaf) was located in the petiole, 25% in the major veins, 25% in the minor veins, and 39% outside the xylem. Sun- establishing species had a higher proportion of leaf resistance in the xylem. Across species, component resistances correlated linearly with total leaf resistance. (.) K-leaf correlated tightly with indices of stomatal pore area, indicating a coordination of liquid- and vapor- phase conductances shifted relative to that of temperate woody species. (.) Leaf hydraulic properties are integrally linked in the complex of traits that define differences in water use and carbon economy across habitats and vegetation zones. (c) New Phytologist ( 2005).
引用
收藏
页码:403 / 413
页数:11
相关论文
共 46 条