Soil microbial biomass and oxy-hydroxides contribute to aggregate stability and size distribution under different land uses in the Central Andes

Coca Salazar, Alejandro Ariel; Cornelis, Jean-Thomas; Carnol, Monique

doi:10.1071/SR21205

Article (Scientific journals)

Soil microbial biomass and oxy-hydroxides contribute to aggregate stability and size distribution under different land uses in the Central Andes

Coca Salazar, Alejandro Ariel; Cornelis, Jean-Thomas; Carnol, Monique

2022 • In Soil Research

Peer reviewed

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https://hdl.handle.net/2268/291436

DOI
10.1071/SR21205

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Keywords :

aggregate stability; Eucalyptus globulus; fallow; land use change; microbial activity; microbial biomass carbon; short-term fallow; silt and clay; soil structure; Solanum tuberosum; Fallow; Microbial activities

Abstract :

[en] Context: Agricultural intensification leads to land use changes with potential consequences for soil aggregate stability and size distribution, affecting nutrient and water retention capacity, aeration, sequestration of soil organic carbon, and biogeochemical cycling. Aims: This study evaluated soil aggregate stability and size distribution under potato, fallow and Eucalyptus globulus L. land uses in Cambisols of the eastern branch of the Central Andes, Bolivia. We also investigated the relation between aggregates and total C, extractable C, oxy-hydroxides, microbial biomass and activity. Methods: Aggregate stability, size distribution and oxy-hydroxides were measured in soil samples from eight plots of each land use. Key results: Compared to fields cultivated with potato (Solanum tuberosum L.), Eucalyptus increased aggregate stability, megaaggregate content, and C and N in the free silt + clay fraction. Fallow did not lead to significant changes in soil structure. Soil aggregate stability was related to both microbial biomass and oxy-hydroxides. Microbial biomass C, microbial activity and dithionite extractable Fe were positively related to megaaggregates and aggregate stability. Oxalate extractable Fe and Mn were related to microaggregates. Conclusions: The plantation of Eucalyptus is suitable for soil structural amelioration and C sequestration, but its introduction to cultivated areas should be carefully evaluated due to its effects on soil chemistry and microbiology. Short-term fallowing did not contribute to the maintenance of soil structure. Implications: In a context of land uses change, modifications of microbial biomass and activity would affect megaaggregate formation and stability. Alternative management practices are required to maintain soil structure and optimize sustainable land use of cultivated and fallow fields.

Disciplines :

Environmental sciences & ecology
Agriculture & agronomy
Phytobiology (plant sciences, forestry, mycology...)

Author, co-author :

Coca Salazar, Alejandro Ariel ; Université de Liège - ULiège > Integrative Biological Sciences (InBioS) ; Laboratorio de Suelos y Aguas, Universidad Mayor de San Simón, Cochabamba, Bolivia

Cornelis, Jean-Thomas ; Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes ; Faculty of Land and Food Systems, The University of British Columbia, Vancouver, Canada

Carnol, Monique ; Université de Liège - ULiège > Integrative Biological Sciences (InBioS)

Language :

English

Title :

Soil microbial biomass and oxy-hydroxides contribute to aggregate stability and size distribution under different land uses in the Central Andes

Publication date :

24 March 2022

Journal title :

Soil Research

ISSN :

1838-675X

eISSN :

1838-6768

Publisher :

CSIRO

Peer reviewed :

Peer reviewed

Development Goals :

2. Zero hunger
15. Life on land

Funders :

ARES CCD - Académie de Recherche et d'Enseignement Supérieur. Coopération au Développement [BE]

Available on ORBi :

since 27 May 2022

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