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Microbial properties in tropical montane forest soils developed from contrasting parent material—An incubation experiment
Author(s) -
Kidinda Laurent K.,
Olagoke Folasade K.,
Vogel Cordula,
Bukombe Benjamin,
Kalbitz Karsten,
Doetterl Sebastian
Publication year - 2022
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.202100274
Subject(s) - soil water , environmental science , mafic , edaphic , nutrient cycle , soil quality , ecosystem , soil organic matter , environmental chemistry , agronomy , soil science , ecology , chemistry , biology , geology , geochemistry
Background Soil microbes are key drivers of carbon (C) and nutrient cycling in terrestrial ecosystems, and their properties are influenced by the relationship between resource demand and availability. Aims Our objective was to investigate patterns of microbial properties and their controls to understand whether they differ between soils derived from geochemically contrasting parent material in tropical montane forests. Methods We measured microbial biomass C (MBC Soil ), potential extracellular enzyme activity (pEEA), and assessed microbial investments in C and nutrient acquisition at the beginning and end of a 120‐day laboratory incubation experiment using soils developed from three geochemically contrasting parent material (i.e., mafic, mixed sediment, and felsic) and three soil depths (0–70 cm). Results We found that MBC Soil and pEEA were highest in soils developed from the mafic parent material. Microbial investment in C acquisition was highest in soils developed from mixed sedimentary rocks and lowest in soils developed from the felsic parent material. We propose that our findings are related to the strength of contrasting mineral‐related C stabilization mechanisms and varying C quality. No predominant microbial investment in nitrogen (N) acquisition was observed, whereas investment in phosphorus (P) acquisition was highest in subsoils. We found lower microbial investment in C acquisition in subsoils indicating relatively high C availability, and that microbes in subsoils can substantially participate in C cycling and limit C storage if moisture and oxygen conditions are suitable. Geochemical soil properties and substrate quality were important controls on MBC Soil per unit soil organic C (MBC SOC ), particularly after the exhaustion of labile and fast cycling C, that is, at the end of the incubation. Conclusion Although a laboratory incubation experiment cannot reflect real‐world conditions, it allowed us to understand how soil properties affect microbial properties. We conclude that parent material is an important driver of microbial properties in tropical montane forests despite the advanced weathering degree of soils.