Structural and functional changes in Nothofagus pumilio forests along an altitudinal gradient in Tierra del Fuego, Argentina

被引:111
作者
Barrera, MD
Frangi, JL
Richter, LL
Perdomo, MH
Pinedo, LB
机构
[1] Natl Univ La Plata, Fac Ciencias Agrarias & Forestales, LISEA, RA-1900 La Plata, Argentina
[2] Consejo Nacl Invest Cient & Tecn, CADIC, RA-9410 Ushuaia, Argentina
关键词
cold temperate forest; growth rate; krummholz; leaf decay; leaf phenology; litter fall; timberline;
D O I
10.2307/3236797
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Structural (density, height, basal area, above-ground tree biomass, leaf area index) and functional (leaf phenology, growth rate, fine litter fall, leaf decomposition) traits were quantified in four mature forests of Nothofagus pumilio (lenga) along an altitudinal sequence in Tierra del Fuego, Argentina. Three erect forest stands at 220, 440 and 540 m and a krummholz stand at 640 m a.s.l. were selected. Along the altitudinal sequence, stem density increased while DBH, height, biomass, leaf-size and growth period, mean growth rate and decay rate decreased. Dead steins increased and basal area and fine-litter fall decreased with an increase in elevation among erect forests, but these trends inverted at krummholz. We suggest that krummholz is not only a morphological response to the adverse climate but is also a life form with functional advantages.
引用
收藏
页码:179 / 188
页数:10
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