Combined Effects of Ozone and Other Environmental Factors on Japanese Trees

Watanabe, Makoto; Hoshika, Yasutomo; Koike, Takao; Izuta, Takeshi

doi:10.1007/978-4-431-56438-6_6

Cited by 6 publications

(9 citation statements)

References 32 publications

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“…Elevated CO 2 -induced decreases in stomatal conductance were also reported in F. crenata and other species under high CO 2 and O 3 levels [50,51]. Compensation for O 3 -induced reductions in area-based CO 2 uptake rates may partly reflect lowered O 3 uptake rates due to stomatal narrowing in response to elevated CO 2 [21,52]. Several studies on broadleaf tree species have reported similar effects of elevated CO 2 alleviating O 3 -related foliar injury [21,51].…”

Section: Discussionmentioning

confidence: 68%

“…Previous studies of plant-level F. crenata responses to interactions of CO 2 and O 3 produced contradictory results, with one study showing increased growth by combined elevated CO 2 and O 3 in greenhouse experiments [50], and another showing that elevated CO 2 concentrations did not mitigate the negative effects of elevated O 3 on plant growth [51]. Whether elevated CO 2 concentrations ameliorate the negative impacts of O 3 on growth is not certain, even in the same species [52]. To understand growth responses of F. crenata to elevated CO 2 and O 3 , changes in C allocation into leaves and effects on A should be investigated collectively.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Combined CO2 and O3 Exposures on Net CO2 Assimilation and Biomass Allocation in Seedlings of the Late-Successional Fagus Crenata

Tobita

Komatsu

Harayama

et al. 2019

Climate

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We examined the effects of elevated CO2 and elevated O3 concentrations on net CO2 assimilation and growth of Fagus crenata in a screen-aided free-air concentration-enrichment (FACE) system. Seedlings were exposed to ambient air (control), elevated CO2 (550 µmol mol−1 CO2, +CO2), elevated O3 (double the control, +O3), and the combination of elevated CO2 and O3 (+CO2+O3) for two growing seasons. The responses in light-saturated net CO2 assimilation rates per leaf area (Agrowth-CO2) at each ambient CO2 concentration to the elevated CO2 and/or O3 treatments varied widely with leaf age. In older leaves, Agrowth-CO2 was lower in the presence of +O3 than in untreated controls, but +CO2+O3 treatment had no effect on Agrowth-CO2 compared with the +CO2 treatment. Total plant biomass increased under conditions of elevated CO2 and was largest in the +CO2+O3 treatment. Biomass allocation to roots decreased with elevated CO2 and with elevated O3. Elongation of second-flush shoots also increased in the presence of elevated CO2 and was largest in the +CO2+O3 treatment. Collectively, these results suggest that conditions of elevated CO2 and O3 contribute to enhanced plant growth; reflecting changes in biomass allocation and mitigation of the negative impacts of O3 on net CO2 assimilation.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Effects of Combined CO2 and O3 Exposures on Net CO2 Assimilation and Biomass Allocation in Seedlings of the Late-Successional Fagus Crenata

Tobita

Komatsu

Harayama

et al. 2019

Climate

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“…Soil-nutrient supply modifies the degree of negative impacts of O 3 in both directions, i.e. enhancement and mitigation Matyssek and Sandermann, 2003;Watanabe et al, 2017b , and therefore, soil-nutrient condition may change the effects of O 3 on soil respiration rate. In fact, according to Andersen and , increases in soil respiration rate of ponderosa pine exposed to O 3 were enhanced under low-nutrient availability.…”

Section: Introductionmentioning

confidence: 99%

Effects of ozone on soil respiration rate of Siebold’s beech seedlings grown under different soil nutrient conditions

Watanabe

Okabe

Kinose

et al. 2019

J. Agric. Meteorol.

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Ozone O 3 is an air pollutant that negatively affect carbon budget in woody plants. In the present study, we aimed to clarify the effects of ozone on soil respiration rate of Siebold's beech seedlings Fagus crenata grown under different soil-nutrient conditions. Seedlings were grown under three levels of O 3 fumigation charcoal-filtered air or O 3 at 1.0 or 1.5 times ambient concentration in combination with three levels of nutrient supplies non-, low-or high-fertilised for two growing seasons. We determined soil respiration rate in July, August, September, and October of the second growing season. The seedlings were harvested to determine the dry mass in October. Significant effect of O 3 on soil respiration rate was not observed in all measurements. There was a significant interaction between O 3 and nutrient supply for whole-root dry mass. The dry mass in non-fertilised and low-fertilised treatments was reduced by O 3 , whereas O 3 did not affect dry mass in the high-fertilised treatment. On the other hand, neither significant effects of O 3 , nor a significant interaction between O 3 and nutrient supply for the biomass allocations were observed. Coefficient of positive correlation in the relation of soil respiration rate with dry mass of fine-root across the all treatments was higher than that in the relation of soil respiration rate with coarse-root and whole-root dry mass. These results indicate that no significant effect of O 3 on soil respiration was mainly attributable to no response of fine root dry mass to elevated O 3 . Soil nutrient supply decreased soil respiration rate in August. Our results emphasize the importance of fine root in the response of soil respiration to elevated O 3 . To clarify the response of soil respiration to elevated O 3 , future researches on the effect of O 3 on fine root dynamics including turnover and indirect effect on soil microbial respiration are needed.

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“…Tropospheric ozone (O 3 ) has detrimental effects on vegetation [1][2][3]. Current O 3 levels adversely affect growth and physiological functions, such as the photosynthesis of forest tree species [4,5]. Because of this phytotoxicity, net primary production (NPP) and biomass accumulation by temperate forests were estimated to be reduced by 1-16% [6].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of O3 Effects on Cumulative Photosynthetic CO2 Uptake in Seedlings of Four Japanese Deciduous Broad-Leaved Forest Tree Species Based on Stomatal O3 Uptake

Yamaguchi

Kinose

Matsumura

et al. 2019

Forests

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The current level of tropospheric ozone (O3) is expected to reduce the net primary production of forest trees. Here, we evaluated the negative effects of O3 on the photosynthetic CO2 uptake of Japanese forest trees species based on their cumulative stomatal O3 uptake, defined as the phytotoxic O3 dose (POD). Seedlings of four representative Japanese deciduous broad-leaved forest tree species (Fagus crenata, Quercus serrata, Quercus mongolica var. crispula and Betula platyphylla var. japonica) were exposed to different O3 concentrations in open-top chambers for two growing seasons. The photosynthesis–light response curves (A-light curves) and stomatal conductance were measured to estimate the leaf-level cumulative photosynthetic CO2 uptake (ΣPn_est) and POD, respectively. The whole-plant-level ΣPn_est were highly correlated with the whole-plant dry mass increments over the two growing seasons. Because whole-plant growth is largely determined by the amount of leaf area per plant and net photosynthetic rate per leaf area, this result suggests that leaf-level ΣPn_est, which was estimated from the monthly A-light curves and hourly PPFD, could reflect the cumulative photosynthetic CO2 uptake of the seedlings per unit leaf area. Although the O3-induced reductions in the leaf-level ΣPn_est were well explained by POD in all four tree species, species-specific responses of leaf-level ΣPn_est to POD were observed. In addition, the flux threshold appropriate for the linear regression of the responses of relative leaf-level ΣPn_est to POD was also species-specific. Therefore, species-specific responses of cumulative photosynthetic CO2 uptake to POD could be used to accurately evaluate O3 impact on the net primary production of deciduous broad-leaved trees.

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Combined Effects of Ozone and Other Environmental Factors on Japanese Trees

Cited by 6 publications

References 32 publications

Effects of Combined CO2 and O3 Exposures on Net CO2 Assimilation and Biomass Allocation in Seedlings of the Late-Successional Fagus Crenata

Effects of Combined CO2 and O3 Exposures on Net CO2 Assimilation and Biomass Allocation in Seedlings of the Late-Successional Fagus Crenata

Effects of ozone on soil respiration rate of Siebold’s beech seedlings grown under different soil nutrient conditions

Evaluation of O3 Effects on Cumulative Photosynthetic CO2 Uptake in Seedlings of Four Japanese Deciduous Broad-Leaved Forest Tree Species Based on Stomatal O3 Uptake

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