Growth and photosynthetic traits of hybrid larch F1 (Larix gmelinii var. japonica x L. kaempferi) under elevated CO2 concentration with low nutrient availability
スポンサーリンク
概要
- 論文の詳細を見る
The hybrid larch F1 (Larix gmelinii var. japonica x Larix kaempferi) is considered as one of the most important tree species not only for timber production but also as an afforestation material for severe conditions such as infertile soil. To predict the ability of hybrid larch F1 as an afforestation material under potential climates in the future, it is important to understand the response of hybrid larch F1 to elevated CO2 concentration ([CO2]) under low nutrient availability. Three-year-old seedlings of hybrid larch F1 were grown under two different levels of [CO2], 360 (ambient) and 720 μmol mol^[-1] (elevated), in combination with two different levels of nitrogen (N) supply (0 and 30 kg ha^[-1]) for one growing season. Elevated [CO2] reduced the maximum rates of carboxylation and electron transport in the needles. Net photosynthetic rates at growth [CO2] (i.e., 360 and 720 μmol mol^[-1] for ambient and elevated treatment, respectively) did not differ between the two CO2 treatments. Reductions in the N content and the N use efficiency to perform photosynthetic functions owing to the deficiency of nutrients other than N, such as P and K, and/or increase of cell wall mass were considered as the factors of photosynthetic down-regulation under elevated [CO2], whereas stomatal closure little affected the photosynthetic down-regulation. Although we observed strong down-regulation of photosynthesis, the dry matter increase of hybrid larch F1 seedlings was enhanced under elevated [CO2]. This is mainly attributable to the increase in the amount of needles with increasing the number of sylleptic branches. These results suggest that elevated CO2 may increase growth of hybrid larch F1 even under low nutrient availability, and that this increase may be regulated by both changes in crown architecture and in needle photosynthesis, which is mainly affected by not stomatal limitation but by biochemical limitation.
著者
関連論文
- Growth and Photosynthetic Performance of Seedlings of Two Larch Species Grown in Shaded Conditions
- Nitrogen Dynamics in Leaves of Deciduous Broad-leaved Tree Seedlings Grown in Summer Green Forests in Northern Japan
- Plant Defense Characteristics and Hypotheses in Birch Species
- Carbon cycling and budget in a forested basin of southwestern Hokkaido, northern Japan
- Micro-Environmental Analysis of the Natural Regeneration of Larch Forests in Northern Japan
- A Trial for Reforestation After Forest Fires with Sakhalin Spruce in the Northern Most Japan
- Comparison of growth characteristics and tolerance to serpentine soil of three ectomycorrhizal spruce seedlings in northern Japan
- Photosynthesis, Leaf longevity and Defense Characteristics in Trees of Betulaceae Planted in Northern Japan
- Bottom-up Regulation for Protection and Conservation of Forest Ecosystems in Northern Japan under Changing Environments
- Growth and photosynthetic traits of hybrid larch F1 (Larix gmelinii var. japonica x L. kaempferi) under elevated CO2 concentration with low nutrient availability
- High nitrogen and elevated [CO2] effects on the growth, defense and photosynthetic performance of two eucalypt species