ABSTRACT
OBJECTIVE:To compare the contents of eucalyptol in Artemisia argyi of 5 different planting densities. METH-ODS:Gas chromatography method was performed on the column of HP-5 capillary column,and cyclohexanone was selected as in-ternal standard,the carrier gas was nitrogen at a flow rate of 0.6 ml/min,the volume temperature was 240℃,the detector tempera-ture was 250 ℃,the split ratio was 10∶1,and the injection volume was 1 μl. RESULTS:The linear range of eucalyptol was 0.420 4-1.261 2 mg/ml(r=0.999 9);RSDs of precision,stability and reproducibility tests were no more than 0.92%;average recovery was 99.6%(RSD=1.4%,n=6). CONCLUSIONS:The method is simple,rapid,accurate,reliable and reproducible,and can be used for the content determination of eucalyptol in A. argyi. The optimal planting density of A. argyi was spaced 30 cm×40 cm.
ABSTRACT
A ocorrência de geada, dependendo do grau de dano, pode se tornar um fator limitante para a condução de florestas de curta rotação. O presente trabalho teve como objetivo avaliar o comportamento após ocorrências de geadas das espécies florestais Acacia mearnsii De Wild, Eucalyptus grandis W. Hill ex Maiden, Mimosa scabrella Benth e Ateleia glazioveana Baill submetidas a níveis de espaçamento de 2,0x1,0m; 2,0x1,5m; 3,0x1,0 e 3,0x1,5m um ano após o plantio, na região Norte do Rio Grande do Sul. Os danos (resistência a geada) foram avaliados segundo o sistema de notas de 0 a 10, conforme a intensidade do dano na planta. Os graus de resistência à geada foram determinados em função da intensidade do dano na planta. Os níveis de espaçamento estudados não afetaram respostas das espécies em relação ao dano ocasionado por geada. A espécie Mimosa scabrella apresentou ser resistente, enquanto que Eucalyptus grandis e Ateleia glazioveana, tolerantes. Já a Acacia mearnsii apresentou ser moderadamente tolerante a tolerante.
The frost occurrence depending on the damage degree, can become a limit factor for the transport of forests of short rotation. The present research has as objective evaluate the behavior after occurrences of frosts of the species forest Acacia mearnsii De Wild, Eucalyptus grandis W. Hill ex Maiden, Mimosa scabrella Benth and Ateleia glazioveana Baill were submitted to levels of spacing of 2.0 x 1.0m; 2.0x1.5m; 3.0x1.0m and 3.0x1.5m one year after the planting, in the North of Rio Grande do Sul. The damages (resistance to frost) were appraised according to scale 0 to 10 according to the intensity of the damage in the plant. The frost resistance degrees were certain in function of the intensity of the damage in the plant. The spacing levels studied didn't affect the species answers in relation to the damage caused by frost. The species Mimosa scabrella presented to be resistant, while Eucalyptus grandis and Ateleia glazioveana tolerant. Already the Acacia mearnsii was moderately tolerant to tolerant.