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
作者： Luan, Haoan 1 ; Yuan, Shuo 2 ; Gao, Wei 3 ; Tang, Jiwei 2 ; Li, Ruonan 4 ; Zhang, Huaizhi 2 ; Huang, Shaowen 2 ;
作者机构： 1.Hebei Agr Univ, Coll Forestry, Baoding 071000, Peoples R China
2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizer, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China
3.Tianjin Inst Agr Resources & Environm, Tianjin 300192, Peoples R China
4.Hebei Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Shijiazhuang 050051, Hebei, Peoples R China
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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