施翠娥; 艾弗逊; 汪承润; 颜守保; 车运城
June 2016
Journal of Agro-Environment Science;2016, Vol. 35 Issue 6, p1103
Academic Journal
Pot cultivation of green vegetables was performed in Open Top Chamber(OTC) platform to investigate the effects of elevated [CO2], [O3] or [CO2+O3] on soil physicochemical properties, microbial biomass and soil enzyme activities. And thus to explore the ecological risk of elevated atmospheric CO2 or/and O3 on soil microbial systems in the future. The results showed that the elevated[CO2] increased the contents of dissolved organic carbon(DOC), dissolved organic nitrogen(DON), total phosphorus(TP), total carbon(TC), ammonium nitrogen(AN), nitric nitrogen(NN), and soil water content(SWC) to some extent. And thus differentially promoted the contents of microbial biomass carbon(MBC), microbial biomass nitrogen(MBN) as well as activities of soil protease(PRA), sucrase(SA), urease(UA), phenol oxidase(POA), acid phosphatase(APA) and neutral phosphatase(NPA) in the soils. Contrarily, the elevated [O3] reduced the contents of DOC, TP, TK, TC, TN, AN, NN, SWC, MBC and MBN to some extent, increased ratios of MBC/MBN, and contributed to the decreased activities of PRA, SA, UA, POA, APA and NPA to some extent. However, to some extent, [CO2+O3] alleviated the inhibition of the soil microbial biomass and soil enzyme activities by the elevation of [O3], and also limited the activation by [CO2]. Meanwhile, the elevation of [CO2], [O3] or [CO2+O3] did not change the tendency of the soil physicochemical properties, microbial biomass and enzyme activities. Therefore, the unusual alteration of soil microbial biomass and soil enzyme activities can be used for assessment of the effects of elevated atmospheric CO2 or/and O3 on soil microbial environment of vegetable fields in the future.


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