Microbial Residue Distribution in Microaggregates Decreases with Stand Age in Subtropical Plantations

编号 010035503

推送时间 20220808

研究领域 森林生态 

年份 2022 

类型 期刊 

语种 英语

标题 Microbial Residue Distribution in Microaggregates Decreases with Stand Age in Subtropical Plantations

来源期刊 forest

期 第355期

发表时间 20220720

关键词 stand age;  amino sugars;  soil aggregates;  subtropical plantation; 

摘要 Soil microbial residues contribute to the majority of stable soil organic carbon (SOC) pools, and their distribution among aggregate fractions determines long-term soil carbon (C) stability and, consequently, soil productivity. However, how microbial residue accumulation and distribution respond to stand age remains unexplored. To fill this knowledge gap, we investigated microbial residues in bulk soil and soil aggregate fractions under a chronosequence of Chinese fir (Cunninghamia lanceolata [Lamb.] Hook) plantations with stands aged 3, 17, 27, and 36 years. The results showed that microbial residues in topsoil did not change across the different stand ages, but the residues in the subsoil increased from 3 to 17 years of age and then remained constant. Moreover, microbial residue distribution in microaggregates decreased with stand age, and the residue distribution in small macroaggregates was lower at age 17 years than at other stand ages. The effect of stand age on microbial residue distribution was due to the fact of their effect on aggregate distribution but not microbial residue concentrations in aggregate fractions. Collectively, our results indicate that microbial residue stability decreased with stand age, which has significant implications for the management of SOC in subtropical plantations. View Full-Text

服务人员 王璐

服务院士 蒋有绪

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