The results of plant indicators under the elevated CO2 showed that there is the same trend between morphological indexes, physiological indexes and biomass of the plant and soil microbial quantity. When the concentration of CO2 were increased from normal atmosphere to 20000μmol/mol, elevated CO2 promoted the growth of plant, the plant photosynthesis become stronger, it provided a wealth of organic substrates for soil microorganisms, so as to promote the growth and reproduction of soil microbe. When the CO2 concentration were greater than 20000μmol/mol, the
indicators of plant were restrained, the overall metabolism function of plant were dropped, and the nutrients in plant transformation were reduced, thereby the growth of the soil microorganisms was inhibited. Moreover, when the CO2 concentration in the atmosphere was much higher than that in the soil, a portion of the CO2 may entered the soil, and had a direct influence on microorganisms. It may led to the deaths of a lot of soil microbial, and the soil microbial quantity was decreased.
The results of plant indicators under the elevated CO2 showed that there is the same trend between morphological indexes, physiological indexes and biomass of the plant and soil microbial quantity. When the concentration of CO2 were increased from normal atmosphere to 20000μmol/mol, elevated CO2 promoted the growth of plant, the plant photosynthesis become stronger, it provided a wealth of organic substrates for soil microorganisms, so as to promote the growth and reproduction of soil microbe. When the CO2 concentration were greater than 20000μmol/mol, theindicators of plant were restrained, the overall metabolism function of plant were dropped, and the nutrients in plant transformation were reduced, thereby the growth of the soil microorganisms was inhibited. Moreover, when the CO2 concentration in the atmosphere was much higher than that in the soil, a portion of the CO2 may entered the soil, and had a direct influence on microorganisms. It may led to the deaths of a lot of soil microbial, and the soil microbial quantity was decreased.
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