Sammanfattning

Warmer climates induced by elevated atmospheric CO2 (eCO(2)) are expected to increase damaging bark beetle activity in pine forests, yet the effect of eCO(2) on resin production-the tree's primary defense against beetle attack-remains largely unknown. Following growth-differentiation balance theory, if extra carbohydrates produced under eCO(2) are not consumed by respiration or growth, resin production could increase. Here, the effect of eCO(2) on resin production of mature pines is assessed. As predicted, eCO(2) enhanced resin flow by an average of 140% (P = 0.03) in canopy dominants growing in low-nitrogen soils, but did not affect resin flow in faster-growing fertilized canopy dominants or in carbohydrate-limited suppressed individuals. Thus, pine trees may become increasingly protected from bark beetle attacks in an eCO(2) climate, except where they are fertilized or are allowed to become overcrowded.

Nyckelord

bark beetles; carbon allocation; Free Air CO2 Enrichment; Pinus taeda; resin flow; resistance

Publicerad i

Tree Physiology
2012, Volym: 32, nummer: 6, sidor: 752-763
Utgivare: OXFORD UNIV PRESS

SLU författare

• Oren, Ram

  • Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
    

Globala målen

SDG13 Vidta omedelbara åtgärder för att bekämpa klimatförändringarna och dess konsekvenser


UKÄ forskningsämne

Skogsvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1093/treephys/tpr133

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/41095