Aggregate-related changes in living microbial biomass and microbial necromass associated with different fertilization patterns of greenhouse vegetable soils

文献类型： 外文期刊

第一作者： Luan, Haoan

作者： Luan, Haoan;Yuan, Shuo;Tang, Jiwei;Zhang, Huaizhi;Huang, Shaowen;Gao, Wei;Li, Ruonan

作者机构：

关键词： Fertilization; Soil aggregate distribution; Living microbial biomass; Microbial necromass; Soil C dynamics

期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：2.285； 五年影响因子：2.829 ）

ISSN： 1164-5563

年卷期： 2021 年 103 卷

页码：

收录情况： SCI

摘要： Knowledge on soil aggregation and microbial-driven soil C dynamics at the aggregate scale is beneficial for longterm sequestration of C in greenhouse vegetable production (GVP) systems. Here, we used an eight-year fertilization experiment to compare the effects of organic vs. chemical fertilization on soil aggregate stability, as well as living microbial biomass, microbial necromass, and soil C dynamics at the aggregate scale. Relative to chemical fertilization treatment, organic amendments (e.g., manure and/or straw) could improve soil physical quality (as indicated by the value of mean weight diameter), increase microbial biomass and residues, as well as enhance the contributions of microbes to soil organic C (SOC) accumulation within large macroaggregates, small macroaggregates, microaggregates, and silt/clay fractions. Microbial biomass and residues were unevenly distributed among aggregates under different fertilization patterns, i.e., organic amendments made microbial biomass and fungal residues enriched from in silt/clay fractions to in macroaggregates. The low proportions of microbial residue C in SOC in microaggregates demonstrated that the microhabitat of microaggregates limits microbial necromass contributions to SOC accumulation. The changes of microbial biomass were closely related to extractable organic C (EOC), while the variations of fungal and bacterial residues were intimately associated with its corresponding microbes (i.e., fungal and bacterial PLFAs) and enzymes. Moreover, microbial associated ratios (e.g., fungal/bacterial PLFAs) were largely influenced by aggregates and strongly associated with soil chemical associated ratios (e.g., EOC/EON). Our findings provide useful insights on soil microbial-driven C dynamics at the aggregate scale in GVP systems under different fertilization patterns in China.

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