Extracellular polymeric substances are closely related to land cover, microbial communities, and enzyme activity in tropical soils

IF 9.8 1区 农林科学 Q1 SOIL SCIENCE Soil Biology & Biochemistry Pub Date : 2023-10-22 DOI:10.1016/j.soilbio.2023.109221
Laurent K. Kidinda , Doreen Babin , Sebastian Doetterl , Karsten Kalbitz , Basile B. Mujinya , Cordula Vogel
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Abstract

Extracellular polymeric substances (EPS) form the main matrix of microbial biofilms and play a crucial role in maintaining microbial life. However, factors influencing EPS concentration and production in soil are poorly understood. Here we show that EPS are closely related to microbial communities and nutrient acquisition in tropical forest and cropland soils with varying iron-aluminum-manganese concentrations and total reserve in base cations. We found under homogenized moisture and temperature conditions that EPS concentration and production efficiency (i.e., EPS per unit of microbial biomass) depend more on land cover than on geochemical soil properties. EPS concentration and production efficiency were higher in cropland than in forest soil and were related to the higher relative abundance of microbial sequences identified as Paenibacillaceae, Ramlibacter, Chaetosphaeria, Burkholderiaceae, and Xanthobacteraceae, pointing to potential EPS producers. In contrast, lower EPS concentration in forest soil was related to the higher relative abundance of microbial sequences associated with e.g., Gemmatimonas and Massilia, suggesting potential EPS degradation. We also found that EPS production efficiency was positively related to microbial investment in nutrient acquisition, implying that EPS production likely follows the same principles as extracellular enzyme activity. That is, EPS production may increase when resources are scarce to facilitate nutrient acquisition, and decrease when resources are abundant. Overall, microbial community composition and resource demand seem to control EPS degradation and accumulation in tropical soils, which could influence microbially-driven carbon and nutrient cycling.

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细胞外聚合物质与热带土壤的土地覆盖、微生物群落和酶活性密切相关
细胞外聚合物(EPS)是微生物生物膜的主要基质,在维持微生物生命中起着至关重要的作用。然而,影响土壤中EPS浓度和生产的因素了解甚少。研究表明,在不同铁铝锰浓度和碱态总储量的热带森林和农田土壤中,EPS与微生物群落和养分获取密切相关。我们发现,在均匀的水分和温度条件下,EPS浓度和生产效率(即单位微生物生物量的EPS)更多地取决于土地覆盖,而不是土壤地球化学性质。农田土壤中EPS浓度和生产效率均高于森林土壤,这与Paenibacillaceae、Ramlibacter、Chaetosphaeria、burkholderaceae和Xanthobacteraceae等微生物序列的相对丰度较高有关,表明农田土壤中存在潜在的EPS产生菌。相比之下,森林土壤中EPS浓度较低与Gemmatimonas和Massilia等相关微生物序列的相对丰度较高有关,表明EPS可能降解。我们还发现,EPS的生产效率与微生物在养分获取方面的投资呈正相关,这意味着EPS的生产可能遵循与细胞外酶活性相同的原理。也就是说,当资源稀缺时,EPS产量可能会增加,以促进养分的获取,而当资源丰富时,EPS产量可能会减少。总体而言,微生物群落组成和资源需求似乎控制了热带土壤中EPS的降解和积累,这可能影响微生物驱动的碳和养分循环。
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来源期刊
Soil Biology & Biochemistry
Soil Biology & Biochemistry 农林科学-土壤科学
CiteScore
16.90
自引率
9.30%
发文量
312
审稿时长
49 days
期刊介绍: Soil Biology & Biochemistry publishes original research articles of international significance focusing on biological processes in soil and their applications to soil and environmental quality. Major topics include the ecology and biochemical processes of soil organisms, their effects on the environment, and interactions with plants. The journal also welcomes state-of-the-art reviews and discussions on contemporary research in soil biology and biochemistry.
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