Effects of long-term fertilization on soil organic carbon mineralization and microbial community structure

• DOI: 10.1371/journal.pone.0211163
• Publication Date: 2019-01-25T18:31:30Z
• Authors: Zhen Guo; Jichang Han; Juan Li; Yan Xu; Xiaoli Wang
• Keywords: Soil carbon; Nitrogen Cycle

Soil microorganisms play a pivotal role in carbon mineralization and their diversity is crucial to the function of soil ecosystems. However, effects long-term fertilization on microbial-mediated are poorly understood. To identify relative roles microbes yellow paddies, we investigated properties microbial communities relationships with mineralization. The treatments included: no (CK), chemical fertilizer (NPK), organic (M), constant organic-inorganic (MNPK). NPK treatment significantly increased water content (WC), while M MNPK (SOC), total nitrogen (TN), biomass (SMBC), (SMBN), WC. Strong increases CO2 emissions, potential mineralized carbon, turnover rate were observed both organic-fertilizer (M MNPK), CK treatment. These changes can be attributed variation communities. had significant effect. Different changed community; SOC SMBN most important contributors variance community composition. variations composition did not influence mineralization; however, was influenced by abundance several non-dominant bacteria. results suggest that SOC, SMBN, bacteria (Gemmatimonadetes Latescibacteria), have close relationship mineralization, should preferentially considered predicting under fertilization.