Effects of elevated CO 2 and O 3 and N fertilization on amount of soil microbial biomass carbon in spring wheat growing season

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Abstract

Experimental platform of Open-top chambers (OTC) was established in 2006 over a spring wheat system, it located at the National Field Observation and Research Station of Shenyang Agro-ecosystems, a member of Chinese Ecosystem Research Network (CERN) established in 1987. We compared the dynamics of soil microbial biomass C with high (225.0 kg N hm -2 ) and low (150 kg N hm -2 ) application rate of chemical fertilizer N exposed to the elevated CO 2 , O 3 , CO 2 plus O 3 and CK after the spring wheat growing season in 2010. The results showed that under elevated CO 2 concentration at the jointing stage, high application rate of chemical fertilizer N significantly declined the amount of soil microbial biomass C by 64.97%, compared with the low N application rate of chemical fertilizer N (p<0.01). In treatment with low application rate of chemical fertilizer N, elevated O 3 concentration significantly declined the amount of soil microbial biomass C by 52.49% (p<0.05), compared with CK. In treatment with high application rate of chemical fertilizer N, the interaction of CO 2 and O 3 increased significantly the amount of soil microbial biomass C by 50.03% (p<0.05), compared with CK. At the ripening stage, under elevated CO 2 concentration and interaction of CO 2 and O 3 , high application rate of chemical fertilizer N significantly decreased the amount of soil microbial biomass C by 32.92% and 41.45%, compared with low N application rate of chemical fertilizer N, respectively (p<0.05). In treatment with low application rate of chemical fertilizer N, elevated CO 2 and interaction of CO 2 and O 3 significantly increased the amount of soil microbial biomass C by 25.32% and 38.59% (p<0.05), compared with CK, respectively. © 2011 Published by Elsevier Ltd.

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Fang, R., Shi, Y., Lu, C., & Chen, X. (2011). Effects of elevated CO 2 and O 3 and N fertilization on amount of soil microbial biomass carbon in spring wheat growing season. In Procedia Environmental Sciences (Vol. 8, pp. 34–39). Elsevier B.V. https://doi.org/10.1016/j.proenv.2011.10.008

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