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| Influence of Elevated Atmospheric CO2 Concentration and Temperature on Growth and Yield of Early Rice |
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| KeyWord:open-top chamber; elevated CO2 concentration; temperature rise; early rice; growth; yield |
| Author Name | Affiliation | | WAN Yun-fan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China | | YOU Song-cai | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China | | LI Yu-e | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China | | WANG Bin | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China | | GAO Qing-zhu | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China | | QIN Xiao-bo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China | | LIU Shuo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences /Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing100081, China |
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| Abstract: |
| It is very important for national cereal security evaluation to study the influence of elevated CO2 concentration and temperature on early rice growth and yield under changed climate scenario. We studied the effects of 450 μL·L-1 CO2 concentration and 2 ℃ temperature increments on early rice growth and yield in an early rice field using a modified open-top chamber method. There were 3 treatments with 3 replication per treatment：①Check OTC（ambient atmospheric CO2 and temperature）, ②air temperature increase by 2 ℃, and ③air temperature increase by 2 ℃ plus 60 μL·L-1 CO2 elevation. Treatment with both CO2 concentration and temperature rise significantly increased the final height of early rice, while temperature alone expedited plant elongation speed only without showing effects on the final height of early rice. Elevated temperature increased the number of tiller of early rice by 2~3 tillers per hole, but CO2 had no obvious effects on the number of tiller of early rice. Increasing CO2 concentration had a positive effect on leaf chlorophyll content, but increasing temperature did not. The aboveground biomass of early rice was not influenced by temperature rise, but increased significantly by temperature plus CO2 concentration. Grain yield of early rice was increased by 13.3% by temperature rise, but was no additional increase by elevated CO2. Temperature influenced yields via increasing spike rates and grains per spike. |
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