Rice Free-Air Carbon Dioxide Enrichment Studies to Improve Assessment of Climate Change Effects on Rice Agriculture

Hasegawa, Toshihiro; Sakai, Hidemitsu; Tokida, Takeshi; Usui, Yasuhiro; Yoshimoto, Mayumi; Fukuoka, Minehiko; Nakamura, Hirofumi; Shimono, Hiroyuki; Okada, Masumi

doi:10.2134/advagricsystmodel7.2014.0015

Cited by 30 publications

(47 citation statements)

References 53 publications

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“…Similar to Hasegawa et al. (), our study found a linear relationship between V c,max25 and N l , and both studies suggested that the relationship may be different between Takanari and Koshihikari, although the varietal difference was not statistically significant in this study (Figure ). The discrepancy might be attributed to the fact that V c,max25 was calculated in this study under the assumption that mesophyll conductance is infinite.…”

Section: Discussionsupporting

confidence: 89%

“…The CO 2 effect on V c,max25 was not statistically significant ( p = .07); however, the extent of decrease in V c,max25 in E‐CO 2 (12%) was comparable to the average decrease V c,max25 (13%) reported in a meta‐analysis of FACE studies (Ainsworth & Long, ) and within the range of the V c,max25 downregulation for rice plants as reported by Hasegawa et al. () (~8.8%). Therefore, we set γ vc at 0.37 so that the ratio of f down (E‐CO 2 ) and f down (A‐CO 2 ) equals the ratio of V c,max25 in E‐CO 2 and that in A‐CO 2 .…”

Section: Resultssupporting

confidence: 71%

“…Data were pooled for the upper and lower canopy leaves. The dotted line shows the relationship obtained byHasegawa et al (2016) (V c,max25 = 1.22N l À 42.3). V c,max25 was measured at 30°C and corrected for 25°C using the temperature function of…”

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confidence: 85%

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Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Ikawa

Chen

Sikma

et al. 2017

Global Change Biology

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Achieving higher canopy photosynthesis rates is one of the keys to increasing future crop production; however, this typically requires additional water inputs because of increased water loss through the stomata. Lowland rice canopies presently consume a large amount of water, and any further increase in water usage may significantly impact local water resources. This situation is further complicated by changing the environmental conditions such as rising atmospheric CO concentration ([CO ]). Here, we modeled and compared evapotranspiration of fully developed rice canopies of a high-yielding rice cultivar (Oryza sativa L. cv. Takanari) with a common cultivar (cv. Koshihikari) under ambient and elevated [CO ] (A-CO and E-CO , respectively) via leaf ecophysiological parameters derived from a free-air CO enrichment (FACE) experiment. Takanari had 4%-5% higher evapotranspiration than Koshihikari under both A-CO and E-CO , and E-CO decreased evapotranspiration of both varieties by 4%-6%. Therefore, if Takanari was cultivated under future [CO ] conditions, the cost for water could be maintained at the same level as for cultivating Koshihikari at current [CO ] with an increase in canopy photosynthesis by 36%. Sensitivity analyses determined that stomatal conductance was a significant physiological factor responsible for the greater canopy photosynthesis in Takanari over Koshihikari. Takanari had 30%-40% higher stomatal conductance than Koshihikari; however, the presence of high aerodynamic resistance in the natural field and lower canopy temperature of Takanari than Koshihikari resulted in the small difference in evapotranspiration. Despite the small difference in evapotranspiration between varieties, the model simulations showed that Takanari clearly decreased canopy and air temperatures within the planetary boundary layer compared to Koshihikari. Our results indicate that lowland rice varieties characterized by high-stomatal conductance can play a key role in enhancing productivity and moderating heat-induced damage to grain quality in the coming decades, without significantly increasing crop water use.

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Section: Discussionsupporting

confidence: 89%

Section: Resultssupporting

confidence: 71%

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Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Ikawa

Chen

Sikma

et al. 2017

Global Change Biology

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“…3f . There are uncertainties in the crop models under increasing temperatures and CO 2 concentrations Li et al, 2015 . A recent summary of free-air CO 2 enrichment experiments on rice in multiple environments demonstrated a strong negative interaction between temperature and CO 2 on grain yield Hasegawa et al, 2016 . However, the H / H model is still not capable of reproducing the interaction, so the current estimates of CO 2 fertilization effects may be too optimistic.…”

Section: Brown Rice Yield [T Ha -1 ]mentioning

confidence: 99%

Large-scale evaluation of the effects of adaptation to climate change by shifting transplanting date on rice production and quality in Japan

Ishigooka

Fukui

Hasegawa

et al. 2017

J. Agric. Meteorol.

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We evaluated the effect of projected increasing temperatures due to climate change on the yield and quality of rice, as well as the effectiveness of shifting the transplanting date as an adaptation measure, throughout Japan. As an indicator of rice quality, we adopted the heat stress index HD_m26, which is related to the decreased percentage of first grade rice due to high temperature, calculated as the cumulative temperature within 20 days after the heading date. We used a process-based rice growth model to assess the effect. We implemented the model for the period 1981 -2100, and shifted the transplanting dates at 7-day intervals from -70 to +70 days from the standard transplanting date. The estimated yield was categorized into three classes with different degrees of quality degradation risk according to values of HD_ m26. Relative to the current transplanting date, nationwide total production was estimated to increase slightly in most climate change scenarios, although the proportion of production with quality degradation risk may increase with the rise in temperature. It may be possible to avoid this increased risk while maintaining total production by selecting an optimum transplanting date in consideration of both yield and quality. However, a large decrease in yield was found in some areas, suggesting that the current rice producing regions in Japan would become separated into suitable and unsuitable areas as temperatures increase.

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“…These warming effects of CO2 elevation can have negative impacts on yields, for example, through acceleration of seed development or occurrence of spike sterility (e.g., Julia & Dingkuhn, ). Long‐term FACE data analysis showed that yield enhancement by elevated [CO 2 ] (fertilization) was reduced by the increase in temperature during the grain filling (Hasegawa et al, ), and grain quality was severely reduced by elevated [CO 2 ] notably in hot years (Usui et al, ). Our results suggest that a shift to Takanari might be a good alternative to cope with near‐future climate change as the CO 2 induced warming is smaller in this variety.…”

Section: Resultsmentioning

confidence: 99%

Quantifying the Feedback Between Rice Architecture, Physiology, and Microclimate Under Current and Future CO₂ Conditions

et al. 2020

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To assess the micrometeorological consequences of rice variety choices in relation to rising CO2 associated to climate change, we quantified the interplay between rice architecture, physiology, and microclimate in current (~385 μmol mol−1) and future (~580 μmol mol−1) CO2 microenvironments. Two rice varieties contrasting in canopy structure and physiology were grown embedded in irrigated rice paddies, under elevated CO2 (using a Free‐Air CO2 Enrichment facility) and ambient CO2 conditions. The high‐yielding indica variety Takanari is more photosynthetically active and characterized by a more open canopy than a commonly cultivated variety Koshihikari. Our results show a strong diurnal interplay between solar angle, canopy structure, plant physiology, and the overlying atmosphere. Plant architecture was identified as a strong determinant of the relation between plant physiology and microclimate that in turn affects the surface forcing to the overlying atmosphere. Takanari was able to maintain lower canopy temperature both in current and future CO2 owing to the greater atmospheric mixing and stomatal conductance than Koshihikari. In the perspective of food security, a shift to such a higher‐yielding variety would have consequences on the regional surface energy balance, which subsequently might alter regional weather.

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Rice Free-Air Carbon Dioxide Enrichment Studies to Improve Assessment of Climate Change Effects on Rice Agriculture

Cited by 30 publications

References 53 publications

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Large-scale evaluation of the effects of adaptation to climate change by shifting transplanting date on rice production and quality in Japan

Quantifying the Feedback Between Rice Architecture, Physiology, and Microclimate Under Current and Future CO₂ Conditions

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Rice Free-Air Carbon Dioxide Enrichment Studies to Improve Assessment of Climate Change Effects on Rice Agriculture

Cited by 30 publications

References 53 publications

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO2 enrichment

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO2 enrichment

Large-scale evaluation of the effects of adaptation to climate change by shifting transplanting date on rice production and quality in Japan

Quantifying the Feedback Between Rice Architecture, Physiology, and Microclimate Under Current and Future CO2 Conditions

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Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Quantifying the Feedback Between Rice Architecture, Physiology, and Microclimate Under Current and Future CO₂ Conditions