Summer temperature affects the ratio of radial and height growthof Scots pine in northern Finland
International audience Radial and height growth chronologies from 150-year-old and 50-year old Scots pine stands, both located near to the northern timberline in Laanila, Finland (68° 30′ N, 27° 28′ E), were cross-correlated with each other and with mean temperatures of various temperature periods d...
| Published in: | Annals of Forest Science |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
HAL CCSD
2009
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| Subjects: | |
| Online Access: | https://hal.archives-ouvertes.fr/hal-00883554 https://hal.archives-ouvertes.fr/hal-00883554/document https://hal.archives-ouvertes.fr/hal-00883554/file/hal-00883554.pdf https://doi.org/10.1051/forest/2009074 |
| Summary: | International audience Radial and height growth chronologies from 150-year-old and 50-year old Scots pine stands, both located near to the northern timberline in Laanila, Finland (68° 30′ N, 27° 28′ E), were cross-correlated with each other and with mean temperatures of various temperature periods defined as months, days or growing-degree-days.* The height-growth chronology correlates significantly with radial growth at lags 1 and 2, and radial growth with height growth at lag 2 when the effect of temperature is omitted. On average, low and high growth years represent cool and warm average growing seasons. The summer temperatures (June, July and August) affect most on growth, but height and radial growth do have a different set of effective temperature periods. Furthermore, July temperature variation affects stronger height than radial growth.* Those years with low height/radial-growth ratio, i.e. relatively higher current year's radial than next year's height growth, do have lower growth and cooler-than-average July temperature whereas those years with high height/radial-growth ratio do have clearly warmer mid-summer temperatures. Les chronologies de croissance en hauteur et de croissance radiale de peuplements de pins sylvestres âgés de 50 et 150 ans, localisés près de la limite septentrionale de la forêt à Laanila en Finlande (68° 30′ N, 27° 28′ E), ont été inter-corrélées entre elles et avec les températures moyennes de différentes périodes de températures définies en terme de mois, de jours ou de degrés jours de période de croissance.* La chronologie de la croissance en hauteur a été significativement corrélée avec la croissance radiale avec un retard de 1 à 2, et la croissance radiale avec la croissance en hauteur avec un retard de 2 quand l'effet de la température n'est pas pris en compte. En moyenne, les années à croissance élevée et faible représentent des saisons de végétation en moyenne chaudes et fraîches. Les températures estivales (juin, juillet, août) affectent fortement la croissance, mais la ... |
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