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A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function
Published on: November 21, 2015
[Effects of double CO2 and O3 on growth and yields in soybean]
Chun-yi Wang1, Yue-ming Bai, Min Wen
1Chinese Academy of Meteorological Sciences, Beijing 100081, China. cas@263.net
Abstract:
The effects of doubled CO2 and O3 interaction on growth and yields in soybean were investigated in the open top chamber for the first time. Increasing CO2 can promote roots growth. The ability of nitrogen fixation enhanced. Plant height and base diameter increased. There are a little effect on the development stage, green leaf number and leaf area. Double O3 concentration inhibited roots and stems growth. The ability of nitrogen fixation decreased. Green leaf number and leaf area decreased and advanced senescence course. This experiment also indicated that CO2 enhancement could relax the injury and inhibition by O3 to soybean seedling. The differences of growth and the ability of nitrogen fixation in soybean between lasted double CO2 and control are less than that of single O3 concentration. Stimulation and dose-effect of increasing CO2 and O3 concentrations to soybean gradually induced more serious damage in the development late. Green leaf number and leaf area decreased. The ability of nitrogen fixation increased markedly.
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