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Arbuscular mycorrhizal fungal and soil microbial communities in African Dark Earths

Camenzind, Tessa ; Hammer, Edith C. LU ; Lehmann, Johannes ; Solomon, Dawit ; Horn, S. ; Rillig, M. C. and Hempel, S. (2018) In FEMS microbiology ecology 94(4).
Abstract

The socio-economic values of fertile and carbon-rich Dark Earth soils are well described from the Amazon region. Very recently, Dark Earth soils were also identified in tropical West Africa, with comparable beneficial soil properties and plant growth-promoting effects. The impact of this management technique on soil microbial communities, however, is less well understood, especially with respect to the ecologically relevant group of arbuscular mycorrhizal (AM) fungi. Thus, we tested the hypotheses that (1) improved soil quality in African Dark Earth (AfDE) will increase soil microbial biomass and shift community composition and (2) concurrently increased nutrient availability will negatively affect AM fungal communities. Microbial... (More)

The socio-economic values of fertile and carbon-rich Dark Earth soils are well described from the Amazon region. Very recently, Dark Earth soils were also identified in tropical West Africa, with comparable beneficial soil properties and plant growth-promoting effects. The impact of this management technique on soil microbial communities, however, is less well understood, especially with respect to the ecologically relevant group of arbuscular mycorrhizal (AM) fungi. Thus, we tested the hypotheses that (1) improved soil quality in African Dark Earth (AfDE) will increase soil microbial biomass and shift community composition and (2) concurrently increased nutrient availability will negatively affect AM fungal communities. Microbial communities were distinct in AfDE in comparison to adjacent sites, with an increased fungal:bacterial ratio of 71%, a pattern mainly related to shifts in pH. AM fungal abundance and diversity, however, did not differ despite clearly increased soil fertility in AfDE, with 3.7 and 1.7 times greater extractable P and total N content, respectively. The absence of detrimental effects on AM fungi, often seen following applications of inorganic fertilizers, and the enhanced role of saprobic fungi relevant for mineralization and C sequestration support previous assertions of this management type as a sustainable alternative agricultural practice.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
African Dark Earth, Arbuscular mycorrhizal fungi, Biochar, Saprotrophic fungi, Soil microbial communities, Terra Preta
in
FEMS microbiology ecology
volume
94
issue
4
article number
fiy033
publisher
Elsevier
external identifiers
  • pmid:29538644
  • scopus:85043777675
ISSN
0168-6496
DOI
10.1093/femsec/fiy033
language
English
LU publication?
yes
id
56f4614f-7d1e-4a11-b022-fa5ab8a507d9
date added to LUP
2018-03-26 13:25:37
date last changed
2020-10-27 01:44:41
@article{56f4614f-7d1e-4a11-b022-fa5ab8a507d9,
  abstract     = {<p>The socio-economic values of fertile and carbon-rich Dark Earth soils are well described from the Amazon region. Very recently, Dark Earth soils were also identified in tropical West Africa, with comparable beneficial soil properties and plant growth-promoting effects. The impact of this management technique on soil microbial communities, however, is less well understood, especially with respect to the ecologically relevant group of arbuscular mycorrhizal (AM) fungi. Thus, we tested the hypotheses that (1) improved soil quality in African Dark Earth (AfDE) will increase soil microbial biomass and shift community composition and (2) concurrently increased nutrient availability will negatively affect AM fungal communities. Microbial communities were distinct in AfDE in comparison to adjacent sites, with an increased fungal:bacterial ratio of 71%, a pattern mainly related to shifts in pH. AM fungal abundance and diversity, however, did not differ despite clearly increased soil fertility in AfDE, with 3.7 and 1.7 times greater extractable P and total N content, respectively. The absence of detrimental effects on AM fungi, often seen following applications of inorganic fertilizers, and the enhanced role of saprobic fungi relevant for mineralization and C sequestration support previous assertions of this management type as a sustainable alternative agricultural practice.</p>},
  author       = {Camenzind, Tessa and Hammer, Edith C. and Lehmann, Johannes and Solomon, Dawit and Horn, S. and Rillig, M. C. and Hempel, S.},
  issn         = {0168-6496},
  language     = {eng},
  month        = {04},
  number       = {4},
  publisher    = {Elsevier},
  series       = {FEMS microbiology ecology},
  title        = {Arbuscular mycorrhizal fungal and soil microbial communities in African Dark Earths},
  url          = {http://dx.doi.org/10.1093/femsec/fiy033},
  doi          = {10.1093/femsec/fiy033},
  volume       = {94},
  year         = {2018},
}