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| Environmental differences inside and outside of an open-top air chamber and its influence on wheat growth |
| Received:April 06, 2022 |
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| KeyWord:open top chamber;wheat;chamber effect;photosynthesis;yield |
| Author Name | Affiliation | E-mail | | TONG Sisi | School of Ecology and Environment, Yunnan University, Kunming 650091, China
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | SUN Xu | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Beijing Urban Ecosystem Research Station, Chinese Academy of Sciences, Beijing 100085, China | | | ZHENG Feixiang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WANG Xiaoke | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | wangxk@rcees.ac.cn |
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| Abstract: |
| To explore the differences inside and outside an open top chamber（OTC）and its implications for plant growth, this study observed meteorological factors, such as air temperature, relative humidity, and photosynthetically-active radiation, as well as the net photosynthetic rate, biomass, and wheat yield. The results showed that during the experimental fumigation period（09：00-17：00）, compared with the outside of the OTC, the temperature inside the OTC increased by 4.8 ℃（P<0.05）, the relative humidity was lower by 0.6 percentage points（P<0.05）, and the photosynthetically active radiation was lower by 32.3%（P<0.05）. The net photosynthetic rate increased the most during the grain filling stage. The OTC could also enhance wheat biomass and yield; relative to outside the OTC, the wheat biomass per individual inside the OTC increased by 13.3%. The greatest increase in wheat component biomass occurred in the spikes （35.2%）, while the yield per individual increased by 49.2%. The number of grains per individual and 1 000-grain weight inside the OTC both increased 34.5% compared with those outside the OTC. Not only do the results indicate that OTC warming could increase crop biomass and yield, but they also suggest that when an OTC is used in manipulative experiments on the effects of increased air CO2 and O3 concentrations on plants, the difference in micrometeorology inside and outside the OTC should be minimized and the warming effects of the OTC on the experimental results should be taken into account. |
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