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根据美国科学家最新试验,大气中二氧化碳浓度的升高使豚草花粉数量增加。研究人员在室内将豚草分别置于模拟二十世纪初大气中二氧化碳浓度280×10-6、现在的370×10-6和
According to the latest test by American scientists, the increase in the concentration of carbon dioxide in the atmosphere increases the amount of ragweed pollen. Researchers in the indoor ragweed were placed in the simulated early twentieth century atmospheric carbon dioxide concentration of 280 × 10-6, the current 370 × 10-6 and