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Land-use intensification and agroforestry in the Kenyan highland: impacts on soil microbial community composition and functional capacity

Lagerlöf, Jan and Adolfsson, Lena and Börjesson, Gunnar and Ehlers, Knut and Palarès Vinyoles, Glòria (2014). Land-use intensification and agroforestry in the Kenyan highland: impacts on soil microbial community composition and functional capacity. Applied soil ecology. 82, 93-99
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Official URL: http://dx.doi.org/10.1016/j.apsoil.2014.05.015

Abstract

This study investigates microbial communities in soil from
sites under different land use in Kenya.
We sampled natural forest, forest plantations, agricultural
fields of agroforestry farms,agricultural fields
with traditional farming and eroded soil on the slopes of Mount Elgon,Kenya. We hypothesised that microbial decomposition capacity, biomass and diversity 1)decreases with intensified cultivation; and 2)can be restored by soil and land management in agroforestry.
Functional capacity of soil microbial communities was estimated by degradation of 31 substrates on Biolog EcoPlates™. Microbial community composition and biomass were
characterised by phospholipid fatty acid (PLFA)and microbial
C and N analyses. All 31 substrates were metabolised in
all studied soil types, i.e. functional diversity did not differ. However,both the substrate utilisation rates and the microbial biomass decreased with intensification of land use, and the biomass was positively correlated with organic matter content. Multivariate analysis of PLFA and Biolog EcoPlate™ data showed clear differences 25
between land uses, also indicated by different relative abundance of PLFA markers for certain microorganism groups.
In conclusion, our results show that vegetation and land use control the substrate utilisation capacity and microbial community composition and that functional capacity of depleted soils can be restored by active soil management, e.g. forest plantation. However, although 20 to 30 years of agroforestry farming practises did result in
improved soil microbiological and chemical conditions
of agricultural soil as compared to traditional agricultural
fields, the change was not statistically significant.

Authors/Creators:Lagerlöf, Jan and Adolfsson, Lena and Börjesson, Gunnar and Ehlers, Knut and Palarès Vinyoles, Glòria
Title:Land-use intensification and agroforestry in the Kenyan highland: impacts on soil microbial community composition and functional capacity
Series/Journal:Applied soil ecology (0929-1393)
Year of publishing :2014
Volume:82
Page range:93-99
Publisher:Elsevier
ISSN:0929-1393
Language:English
Additional Information:Projektnummer 2007-1472-8275-29 och 2009-1978 Projektnamn Soil fauna biodiversity and food web structure in contrasting agricultural systems in Kenya - effects of organic matter and disturbance regimes
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:P Natural resources > P34 Soil biology
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:soil, nutrients, agriculture, forest plantations
Keywords:Biolog EcoPlate (trademark), PLFA, soil nutrients, agriculture, forest plantation, soil C
URN:NBN:urn:nbn:se:slu:epsilon-e-2082
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2082
ID Code:11472
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:FORMAS and Swedish International Development Cooperation Agency
Deposited By: Karin Eriksson
Deposited On:03 Sep 2014 12:49
Metadata Last Modified:02 Dec 2014 11:08

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