Arbuscular mycorrhizal fungus in microbial activity and aggregation of a Cerrado Oxisol in crop sequence

Ciência e Agrotecnologia

Laíze Aparecida Ferreira Vilela²  Orivaldo José Saggin Júnior¹  Helder Barbosa Paulino¹  José Oswaldo Siqueira²  Vera Lúcia Da Silva Santos¹  Marco Aurélio Carbone Carneiro¹ 

[1] ,Universidade Federal de Lavras Departamento de Ciência do Solo Lavras MG ,Brasil

关键词: Microbial carbon;    acid phosphatase;    mean geometric diameter;    mean weight diameter;    soil structure;    Carbono da biomassa microbiana;    fosfatase ácida;    diâmetro médio geométrico;    diâmetro médio ponderado;    estrutura do solo;   

DOI  :  10.1590/S1413-70542014000100004

来源: SciELO

【 摘 要 】

Soil structure has major influence on ecosystem sustainability and plant growth. Arbuscular mycorrhizal fungi (AMF) are an important functional group of soil microbiota, acting in the process of aggregation, especially in agroecosystems and related to the production and plant diversity. AMF are widely distributed in tropical agroecosystems and are extremely important for development of many agricultural crops. The present study evaluated the effect of inoculation with Glomus macrocarpum in different crop sequences on plant growth, microbial activity and aggregation of a Cerrado Oxisol. The study was conducted in a completely randomized design in a4 x 4 factorial scheme. Treatments consisted of four conditions of elimination and/or introduction of AMF (NS-NI: non-sterilized and non-inoculated; NS-I: non-sterilized and inoculated; S-NI: sterilized and non-inoculated; andS-I: sterilized and inoculated) and four crop sequences (Panicum maximum/Panicum maximum, Brachiaria ruziziensis/ soybean, sorghum/soybean and Stylosanthes spp./soybean). Inoculation favored growth of Stylosanthes spp. by increasing plant growth in up to 91% when inoculated. None of the grasses benefited from G. macrocarpum introduction. We observed that G. macrocarpum inoculation associated with indigenous AMF increased microbial biomass, phosphatase activity, mean geometric diameter and mean weighted diameter. The results indicated the beneficial effects of inoculation, which reflected in soil structure improvement and, hence, to agroecosystems sustainability.

【 授权许可】

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