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| DECKER,KELLY L.M; BOERNER,R.E.J. |
| We measured net nitrogen mineralization, net nitrification, proportional nitrification, and total inorganic nitrogen, available phosphorus, and soil organic carbon in five Andean forested stands in an attempt to resolve the relative influence of elevation and forest canopy composition on soil organic matter and nutrient dynamics in this ecosystem type. Our five forested study sites were within a contiguous Nothofagus forest that ranged from 1,280 to 1,700 m elevation in the central Chilean Andes. The five sites consisted of three single species stands, one each of the low elevation deciduous N. obliqua, the evergreen N. dombeyi, or the high elevation deciduous N. pumilio, as well as two mixed evergreen-deciduous stands. There was no statistically... |
| Tipo: Journal article |
Palavras-chave: Chilean Andes; Leaf lifespan; Nitrogen mineralization; Nitrification; Soil carbon. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300003 |
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| Koyama, Kohei; Kikuzawa, Kihachiro. |
| We investigated the leaf demography of a temperate woody liana, Akebia trifoliata, in a temperate forest in Japan, Akebia is semi-evergreen: some leaves are shed before winter, while others remain through the winter. Previous studies of semi-evergreen species found that variation in leaf life span was caused by variation in the timing of leaf emergence, Leaves that appeared just before winter over-wintered, while leaves appearing earlier were shed, However, it is unclear whether leaves of the same cohort (i.e., leaves that appear at the same time within a single site) show variation in life span under the effect of strong seasonality. To separate variation in life span among the leaves in each cohort from variation among cohorts, we propose a new method -... |
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Palavras-chave: Akebia trifoliata; Leaf demography; Leaf lifespan; Leaf phenology; Liana; Phenotypic plasticity; Semi-evergreen. |
| Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4523 |
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| Machado,Juliana Medianeira; Rocha,Marta Gomes da; Quadros,Fernando Luiz Ferreira de; Confortin,Anna Carolina Cerato; Santos,Aline Bosak dos; Sichonany,Maria José de Oliveira; Ribeiro,Laila Arruda; Rosa,Aline Tatiane Nunes da. |
| Morphogenetic and structural characteristics of the native grasses of the Pampa Biome Andropogon lateralis, Aristida laevis, Axonopus affinis, Erianthus angustifolius, Paspalum notatum, Paspalum plicatulum, Piptochaetium montevidense and Sorghastrum pellitum were evaluated as to the effect of nitrogen (N) fertilization (zero and 100 kg N/ha). The experimental design was of randomized blocks with three replicates in a 8 × 2 (native grasses × N) factorial arrangement. Accumulated thermal sums of 350 and 700 degree days determined the interval between cuts for prostrate and caespitose growth habit species, respectively. Species considered of resource conservation (A. laevis, E. angustifolius, P. plicatulum and S. pellitum) had the highest leaf elongation rate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf elongation rate; Leaf lifespan; Number of green leaves; Phyllochron. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100004 |
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