期刊
ANNALS OF FOREST SCIENCE
卷 59, 期 1, 页码 29-40出版社
E D P SCIENCES
DOI: 10.1051/forest:2001003
关键词
growth; Pinus sylvestris; wood density; X-ray densitometry
类别
Effects of nitrogen fertilisation and thinning, 40% basal area removal, on annual ring width and ring density were studied in a 2 x 2 factorial field experiment in northern Sweden, in an even aged 56-year-old Scots pine stand twelve years after treatment. Each treatment was replicated six times. From four stem heights, wood specimens were measured using direct scanning X-ray microdensitometry. For the whole period, mean ring width increased by 14% following fertilisation and by 40% after thinning. Neither fertilisation (<1%) nor thinning (-4%) significantly (p>0.05) changed ring density during the twelve-year period. Based on four-year mean values at 1.3 m, ring width increased in all cases, except for fertilisation in the last four-year period. The only significant effect on wood density was a 5% decrease following thinning during the second four-year period. Linear regression showed negative correlation between ring density and ring width and no additional effects of treatments per se.
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