期刊
NEW PHYTOLOGIST
卷 167, 期 2, 页码 493-508出版社
WILEY
DOI: 10.1111/j.1469-8137.2005.01428.x
关键词
functional groups; leaf lifespan; nitrogen-use efficiency; photosynthesis; respiration; root turnover; specific leaf area; specific root length
(.)Here, we tested hypothesized relationships among leaf and fine root traits of grass, forb, legume, and woody plant species of a savannah community. (CO2)-C-. exchange rates, structural traits, chemistry, and longevity were measured in tissues of 39 species grown in long-term monocultures. (.)Across species, respiration rates of leaves and fine roots exhibited a common regression relationship with tissue nitrogen (N) concentration, although legumes had lower rates at comparable N concentrations. Respiration rates and N concentration declined with increasing longevity of leaves and roots. Species rankings of leaf and fine-root N and longevity were correlated, but not specific leaf area and specific root length. The C-3 and C-4 grasses had lower N concentrations than forbs and legumes, but higher photosynthesis rates across a similar range of leaf N. (.)Despite contrasting photosynthetic pathways and N-2-fixing ability among these species, concordance in above- and below-ground traits was evident in comparable rankings in leaf and root longevity, N and respiration rates, which is evidence of a common leaf and root trait syndrome linking traits to effects on plant and ecosystem processes. (c) New Phytologist (2005).
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