Soil Microbial Activity and Biomass in Semiarid Agroforestry Systems Integrating Forage Cactus and Tree Legumes

Vegetation cover affects soil organic matter and activity of soil microorganisms. We investigated the intercropping effect of forage cactus with tree legumes on soil microbial biomass and organic matter in the semi-arid tropic, state of Pernambuco, Brazil. We assessed the following cropping systems:...

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Bibliographic Details
Published in:Agronomy (Basel) 2021-08, Vol.11 (8), p.1558
Main Authors: Camelo, Dayanne, Dubeux, José Carlos Batista, dos Santos, Mércia Virginia Ferreira, Lira, Mario Andrade, Fracetto, Giselle Gomes Monteiro, Fracetto, Felipe José Cury, da Cunha, Márcio Vieira, de Freitas, Erinaldo Viana
Format: Article
Language:English
Subjects:
Agricultural practices
Agroforestry
Aridity
Biological activity
Biomass
Carbon
Carbon dioxide
Cropping systems
Dry season
Gliricidia sepium
Intercropping
Legumes
Leucaena leucocephala
Metabolism
Microbial activity
microbial biomass
Microbiota
Microorganisms
Mineralization
Monoculture
Nitrogen
Nopalea cochenillifera
Organic matter
Organic soils
Quotients
Rainy season
Respiration
Seasons
Soil investigations
Soil layers
Soil microorganisms
Soil organic matter
Soils
Vegetation
Vegetation cover
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Summary:Vegetation cover affects soil organic matter and activity of soil microorganisms. We investigated the intercropping effect of forage cactus with tree legumes on soil microbial biomass and organic matter in the semi-arid tropic, state of Pernambuco, Brazil. We assessed the following cropping systems: (i) Gliricidia sepium intercropped with cactus cv. IPA-Sertânia; (ii) Leucaena leucocephala intercropped with cactus cv. IPA-Sertânia; and (iii) Cactus cv. IPA-Sertânia in monoculture. Samples were collected during the dry and rainy seasons in the 0- to 0.10- and 0.10- to 0.20-m soil layers at 0, 1.5, 3.0, and 4.5 m in a perpendicular gradient from tree legume rows. The following responses were determined: δ13C and δ15N, C and N, microbial activity and biomass, and metabolic, microbial, and mineralization quotient. δ13C and δ15N varied with the distance from the trees. In the dry season and beginning of the rainy season, the cropping systems showed similar values for C, N, microbial activity, carbon, and nitrogen in the microbial biomass. The presence of tree legumes at the end of the rainy season favored soil microbiota, which showed a reduced loss of C-CO2, with no indication of metabolic stress and greater microbial biomass and microbial quotient in relation to forage cactus in monoculture.
ISSN:2073-4395
2073-4395
DOI:10.3390/agronomy11081558