30 research outputs found
The potential of tree-ring chronologies to global-change studies in the tropics: a quantitative review.
Get PDFQuels facteurs influencent le plus la distribution du bois de cĆur et la croissance radiale dans les plantations de teck?
Full text linkCURSO DIĂRIO E SAZONAL DO POTENCIAL HĂDRICO FOLIAR DE MOGNO EM SISTEMAAGROFLORESTAL1
Get PDFEste trabalho objetivou avaliar o curso diĂĄrio e sazonal do potencial hĂdrico foliar de mogno (Swietenia macrophylla King) (Meliaceae) em sistema agroflorestal (SAF). O experimento foi realizado em ĂĄrvores de S. macrophylla plantadas num sistema agroflorestal instalado no Campo Experimental da Embrapa AmazĂŽnia Ocidental, Manaus, AM. Avaliou-se o potencial hĂdrico foliar (Κf) dos cursos diĂĄrio e sazonal nos anos 2004 e 2005, por meio da utilização de bomba de pressĂŁo tipo Scholander. Os resultados indicaram que os valores do Κf de S. macrophylla, de modo geral, foram superiores no inĂcio da manhĂŁ e no final da tarde, com redução acentuada ao meio-dia, e que, em relação Ă sazonalidade de precipitação, as menores taxas foram reportadas para a Ă©poca menos chuvosa, variando de -26 bar em 2004 para -31bar em 2005. Verificou-se que o potencial hĂdrico de Swietenia macrophylla em sistema agroflorestal sofreu reduçÔes significativas em razĂŁo dos baixos Ăndices pluviomĂ©tricos entre junho e outubro de 2005
Silvicultural performance of forest species introduced in integrated livestock forest system in Lavras, MG, Brazil
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OXYGEN ISOTOPE (ÎŽ18O) OF TEAK TREE-RINGS IN NORTHWEST THAILAND
No full textWe investigated the relationship between the oxygen isotopes in teak (Tectona grandis) tree-ring cellulose and climatic factors, i.e. rainfall, temperature and relative humidity. Four cores of teak from northwest Thailand were used to analyse the oxygen isotope values in α-cellulose. The oxygen isotopic composition of teak tree-ring α-cellulose ranged from 21.38‰ to 25.58‰. The mean tree-ring α-cellulose δ18O values and standard deviations were 23.4 ± 0.7‰. The δ18O value was positively correlated with rainfall in the February to April dry season (r = 0.234, p < 0.5) and negatively correlated with total rainfall (r = -0.350, p < 0.01), average rainfall (r = -0.321, p < 0.01) and relative humidity (r = -0.282, p < 0.05) in the late rainy season. The δ18O values were negatively correlated with the annual mean Palmer Drought Severity Index (PDSI) from 1948 to 2005 (r = -0.491, p < 0.001) based on the mean of 4 grids. Oxygen isotope values in the α-cellulose of teak from northwest Thailand were significantly related to the hydrological cycle in these areas
Analysis of the Preserved Amino Acid Bias in Peptide Profiles of Iron Age Teeth from a Tropical Environment Enable Sexing of Individuals Using Amelogenin MRM
No full textThe potential of teak log coffins collected from Namjang Cave in Northwestern Thailand for studying the coffin culture and paleoclimate in Southeast Asia
No full textEffects of the Pacific Decadal Oscillation on Thailand monsoon rainfall derived from a 194-year tree ring width chronology of teak trees from northwestern Thailand
No full textA 338-year tree-ring oxygen isotope record from Thai teak captures the variations in the Asian summer monsoon system
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