-6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes
The relationship between apical extension and needle density and the effect of temperature and precipitation on needle density was modelled using data gathered from forty-nine felled sample trees in five stands of Scots pine (Pinus sylvestris L.) located along a latitudinal transect from the Arctic...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.566.8152 2023-05-15T15:08:16+02:00 -6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes Hannu Salminen Risto Jalkanen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.566.8152 http://www.metla.fi/silvafennica/full/sf40/sf402183.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.566.8152 http://www.metla.fi/silvafennica/full/sf40/sf402183.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.metla.fi/silvafennica/full/sf40/sf402183.pdf temperature precipitation fascicles needles NTM Pinus sylvestris Authors ’ address F text ftciteseerx 2016-01-08T12:18:07Z The relationship between apical extension and needle density and the effect of temperature and precipitation on needle density was modelled using data gathered from forty-nine felled sample trees in five stands of Scots pine (Pinus sylvestris L.) located along a latitudinal transect from the Arctic Circle up to the northern timberline. The lengths were measured and needle densities assessed from all annual shoots located above 1.3 metres using the Needle Trace Method (NTM), resulting, on average, in 39-year-long chronologies. The mean overall needle density was 7.8 short shoots per shoot centimetre. Needle-density variation in the measured data was mostly due to within-tree differences. Of the total variance, within-tree variation yielded 46%, between-tree 21%, and between-year 27%. The depend-ence of needle density on annual height growth was studied by fitting a multilevel model with random stand-, tree- and year-intercepts, the independent variables being tree age and height growth. There was a very strong negative correlation between height growth and needle density, and the proportion of between-year variance explained solely by height growth and age was 50%. The stand-wise residual variations and their correlations with the temperature and precipitation time series were further analysed with cross-correlation analysis in order to Text Arctic Unknown Arctic The Needle ENVELOPE(-64.047,-64.047,63.267,63.267) |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
topic |
temperature precipitation fascicles needles NTM Pinus sylvestris Authors ’ address F |
spellingShingle |
temperature precipitation fascicles needles NTM Pinus sylvestris Authors ’ address F Hannu Salminen Risto Jalkanen -6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes |
topic_facet |
temperature precipitation fascicles needles NTM Pinus sylvestris Authors ’ address F |
description |
The relationship between apical extension and needle density and the effect of temperature and precipitation on needle density was modelled using data gathered from forty-nine felled sample trees in five stands of Scots pine (Pinus sylvestris L.) located along a latitudinal transect from the Arctic Circle up to the northern timberline. The lengths were measured and needle densities assessed from all annual shoots located above 1.3 metres using the Needle Trace Method (NTM), resulting, on average, in 39-year-long chronologies. The mean overall needle density was 7.8 short shoots per shoot centimetre. Needle-density variation in the measured data was mostly due to within-tree differences. Of the total variance, within-tree variation yielded 46%, between-tree 21%, and between-year 27%. The depend-ence of needle density on annual height growth was studied by fitting a multilevel model with random stand-, tree- and year-intercepts, the independent variables being tree age and height growth. There was a very strong negative correlation between height growth and needle density, and the proportion of between-year variance explained solely by height growth and age was 50%. The stand-wise residual variations and their correlations with the temperature and precipitation time series were further analysed with cross-correlation analysis in order to |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Hannu Salminen Risto Jalkanen |
author_facet |
Hannu Salminen Risto Jalkanen |
author_sort |
Hannu Salminen |
title |
-6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes |
title_short |
-6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes |
title_full |
-6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes |
title_fullStr |
-6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes |
title_full_unstemmed |
-6Ê Modelling Variation of Needle Density of Scots Pine at High Latitudes |
title_sort |
-6ê modelling variation of needle density of scots pine at high latitudes |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.566.8152 http://www.metla.fi/silvafennica/full/sf40/sf402183.pdf |
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ENVELOPE(-64.047,-64.047,63.267,63.267) |
geographic |
Arctic The Needle |
geographic_facet |
Arctic The Needle |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
http://www.metla.fi/silvafennica/full/sf40/sf402183.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.566.8152 http://www.metla.fi/silvafennica/full/sf40/sf402183.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766339659201249280 |