Abstract：Based on the long-term fertilization experiment station established in 1987, 13C labeled maize residues (root or straw) were added into Brown Earth and then in-situ incubated for 150days. We investigated the assimilation dynamics of maize residue carbon (C) by various microbial communities in different soil aggregates with PLFA-SIP technique, as well as the SOC sequestration process. Plant residue addition significantly increased the PLFAs contents, especially fungal PLFAs, in bulk soil and all aggregate fractions. Besides, the increase of gram-negative bacterial PLFA was greater than that of gram-positive bacterial PLFA after residue incorporation. However, residue type did not affect the PLFAs contents in different microbial groups in bulk soil. The difference in the residue C mineralization rate was not significant between the treatments of straw and root additions. The contribution of root C to the total PLFAs C was 3.9 times that of straw C to the total PLFAs C, suggesting that microbial synthesis of root C was more conducive to the sequestration of SOC. Among all microbial groups, the contribution of residue C to fungal PLFA C was highest, indicating that fungi had the strongest ability to assimilate residue C. Whereas, the contribution of residue C to gram-positive PLFA C was similar to that to gram-negative bacterial PLFA C. The contents of residue C and PLFAs and the proportion of residue C in total PLFAs C were higher in the 0.25~1mm and <0.25mm aggregates, while the bacteria/fungi ratio was higher in the >2mm and 1~2mm aggregates which indicated that the 0.25~1mm and <0.25mm aggregates were the main sites for microbial assimilation for residue C. We conclude that the decomposition of plant residue in soil is closely related to residue type, soil aggregate composition and microbial community.
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XU Ying-de, SUN Liang-jie, WANG Yang, GAO Xiao-dan, LI Shuang-yi, WANG Jing-kuan. Characteristics of microbial utilization of maize root- and straw derived carbon. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4504-4513.
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