The impact of climate differences between provenances and progeny test sites on growth traits and basic density in Chamaecyparis obtusa (Siebold et Zucc.) Endl
Yusuke Takahashi , Michinari Matsushita , Akira Tamura , Miyoko Tsubomura , Makoto Takahashi
Journal of Forestry Research ›› 2025, Vol. 36 ›› Issue (1) : 32
The impact of climate differences between provenances and progeny test sites on growth traits and basic density in Chamaecyparis obtusa (Siebold et Zucc.) Endl
Understanding how environmental adaptation varies among families within a species is critical to adapt forestry activities such as management and breeding to possible future climate change. The present study examined home-site advantage and local advantage in growth and basic density of wood in 36 families of Chamaecyparis obtuse (Siebold et Zucc.) Endl., reciprocally planted at two progeny test sites with differing climatic conditions in Japan. A significant home-site advantage for growth was detected between the lowland and mountainous regions within the Kanto breeding region. In addition, the effects of climate differentials between the selection site of mating parents and the progeny test site on growth and basic density were investigated. As a result, temperature was identified as the most significant climatic factor attributed to local adaptation for growth traits. Elongation and radial growth were adversely influenced when the progeny test site temperature exceeded the provenance temperature by more than 2 °C. Therefore, it is crucial to account for temperature differences between the provenance and the planting site to adapt afforestation and forest tree breeding to climate change in the future.
Climate change / Local adaptation / Home-site advantage / Random Forest Model / Tree breeding
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