[논문]RCP 8.5 기후변화 조건에서 콩의 군락 광합성 및 수량 반응 평가

상완규; 백재경; 권동원; 조정일

doi:10.5532/kjafm.2022.24.4.275

RCP 8.5 기후변화 조건에서 콩의 군락 광합성 및 수량 반응 평가
Impact of Climate Change on Yield and Canopy Photosynthesis of Soybean 원문보기

한국농림기상학회지 = Korean Journal of Agricultural and Forest Meteorology, v.24 no.4, 2022년, pp.275 - 284

상완규 (농촌진흥청 국립식량과학원) , 백재경 (농촌진흥청 국립식량과학원) , 권동원 (농촌진흥청 국립식량과학원) , 조정일 (농촌진흥청 국립식량과학원)

초록
AI-Helper

기후변화에 따른 대기 온도 및 이산화탄소 농도의 상승은 농업 생산성에 큰 영향을 미칠 것으로 예상된다. RCP 8.5 시나리오에 따른 21세기말(2071~2100) 기후조건에서는 전 생육기간에 걸쳐 군락광합성이 크게 증가하였으나 이러한 효과가 종실 수량 증가로는 이어지지 않았다. 특히 높은 광합성능으로 인한 바이오매스의 증가는 분지 수 확보에 긍정적으로 작용하여 협수와 립수는 큰 변동이 없었던 반면 립중은 단독 고온 조건과 유사하게 현저히 감소하였다. 이는 등숙기간 중 고온에 의한 동화산물의 축적 및 전류 불량이 주요 요인으로 판단된다. 이러한 결과는 미래 기후 환경에서 종실 수량 감소가 협수와 립수 보다는 립중의 감소에 의한 것임을 의미한다. 이와 같은 결과들은 우리나라 남부지역에서 기후변화에 따른 콩 생육의 불확실성을 해소하고 피해 대책을 마련하기 위한 기초자료로써 유용하게 활용될 것으로 기대된다.

Abstract ▼ AI-Helper

Changes in air temperature, CO2 concentration and precipitation due to climate change are expected to have a significant impact on soybean productivity. This study was conducted to evaluate the climate change impact on growth and development of determinate soybean cultivar in the southern parts of Korea. The high temperature during vegetative period, which does not accompany the increase of CO2 concentration, increased the canopy photosynthetic rate in soybean, but after flowering, the high temperature above the optimal ranges interrupts the photosynthetic metabolism. In yield and yield components, high temperature reduced both the pod and seed number and single seed weight, resulting in a reduction of total seed yield. On the other hand, the increase in CO2 concentration dramatically increased the canopy photosynthetic rate over the whole growth period. In addition, high CO2 concentration increased the number of pods and seeds, which had a positive effect on total seed yield. Under concurrent elevation of air temperature and CO2 concentration, canopy photosynthesis increased significantly, but enhanced canopy photosynthesis did not lead to an increase in soybean seed yield. The increase in biomass and branch by enhanced canopy photosynthesis seems to be attributed to an increase in the total number of pods and seeds per plant, which compensates for the negative effects of high temperature on pod development. However, Single seed weight tended to decrease rapidly by high temperature, regardless of CO2 concentration level. Elevated CO2 concentration did not compensate for the poor distribution of assimilations from source to sink caused by high temperature. These results show that the damage of future soybean yield and quality is closely related to high temperature stress during seed filling period.

주제어

표/그림 (8)

그림 Fig. 1. Daily net photosynthetic rate of soybean canopies at vegetative (DAE 23), flowering (DAE 49) and Seed ripening (DAE 87) stages for environment treatments of elevated air temperature and CO₂ concentration.
표 Table 1. Mean air temperature and CO₂ concentration in the SPAR chambers for environment treatments, ambient (Control), High air CO₂ concentration (HC), High temperature (HT) and Concurrent elevation of air temperature and CO₂ concentration (HTHC) conditions during the growing season
그림 Fig. 2. Analysis of cumulative net assimilation rate by high temperature and elevated CO₂ concentration treatment. (A) Daily canopy net photosynthesis and solar radiation throughout the growth period (B) Gompertz growth model fit to canopy cumulative net assimilation data from each treatment during the entire growing season.
그림 Fig. 3. Soybean canopy at 50 days after emergence under (A) ambient (Control), (B) High air CO₂ concentration (HC), (C) High temperature (HT), (D) Concurrent elevation of air temperature and CO₂ concentration (HTHC) conditions.
그림 Fig. 4. Time series of distribution of dry mass production for soybean grown under (A) Control, (B) High air CO₂ concentration (HC), (C) High temperature (HT), (D) Concurrent elevation of air temperature and CO₂ concentration (HTHC) conditions.
그림 Fig. 5. Analysis of seed size under high temperature and elevated CO₂ concentration treatments. AT, HC, HT, and HTHC indicate control, high air CO₂ concentration, high temperature, concurrent elevation of air temperature and CO₂ concentration treatments, respectively.
표 Table 2. Response of yield and yield component to the treatments of control, high air CO₂ concentration (HC), high temperature (HT), concurrent elevation of air temperature and CO₂ concentration (HTHC) for Daewon cultivar
그림 Fig. 6. The PCA interpretation of yield and yield components for the soybeans grown under four different climate treatments of Control, control, high air CO₂ concentration (HC), high temperature (HT), concurrent elevation of air temperature and CO₂ concentration treatments (HTHC).

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