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Long-term effects of irrigation with waste water on soil AM fungi diversity and microbial activities: the implications for agro-ecosystem resilience.

Alguacil Mdel M, Torrecillas E, Torres P, García-Orenes F, Roldán A - PLoS ONE (2012)

Bottom Line: After 43 years, the soil irrigated with fresh water (FW) had higher AMF diversity than soils irrigated with WW.Microbial activities were significantly higher in the soils irrigated with WW than in those irrigated with FW.Therefore, as no negative effects were observed on crop vitality and productivity, it seems that the ecosystem resilience gave rise to the selection of AMF species better able to thrive in soils with higher microbial activity and, thus, to higher soil fertility.

View Article: PubMed Central - PubMed

Affiliation: CSIC-Centro de Edafología y Biología Aplicada del Segura, Department of Soil and Water Conservation, Campus de Espinardo, Murcia, Spain. mmalguacil@cebas.csic.es

ABSTRACT
The effects of irrigation with treated urban wastewater (WW) on the arbuscular mycorrhizal fungi (AMF) diversity and soil microbial activities were assayed on a long-term basis in a semiarid orange-tree orchard. After 43 years, the soil irrigated with fresh water (FW) had higher AMF diversity than soils irrigated with WW. Microbial activities were significantly higher in the soils irrigated with WW than in those irrigated with FW. Therefore, as no negative effects were observed on crop vitality and productivity, it seems that the ecosystem resilience gave rise to the selection of AMF species better able to thrive in soils with higher microbial activity and, thus, to higher soil fertility.

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Sampling effort curve for the AM fungal sequence types richness observed in this study.The sample order was randomized by 100 replications in EstimateS, version 8.0 [32]. Bars represent error standard (n = 5).
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pone-0047680-g002: Sampling effort curve for the AM fungal sequence types richness observed in this study.The sample order was randomized by 100 replications in EstimateS, version 8.0 [32]. Bars represent error standard (n = 5).

Mentions: The sampling effort curves (Fig. 2) indicated that the number of sequences analysed per sample was sufficient to provide coverage of the AM fungal diversity in the soils irrigated with WW and FW, since both curves reached the plateau. Four AMF sequence types were related to sequences from morphologically-described species (Glo G1 to Glomus trimulares, Glo G9 to Glomus macrocarpum, Glo G10 to Glomus deserticola and Glo G11 to Glomus aggregatum). The rest of the AMF sequence types were either related to uncultured glomalean species or were not related to any sequences of AMF in the database (Fig.1).


Long-term effects of irrigation with waste water on soil AM fungi diversity and microbial activities: the implications for agro-ecosystem resilience.

Alguacil Mdel M, Torrecillas E, Torres P, García-Orenes F, Roldán A - PLoS ONE (2012)

Sampling effort curve for the AM fungal sequence types richness observed in this study.The sample order was randomized by 100 replications in EstimateS, version 8.0 [32]. Bars represent error standard (n = 5).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3475709&req=5

pone-0047680-g002: Sampling effort curve for the AM fungal sequence types richness observed in this study.The sample order was randomized by 100 replications in EstimateS, version 8.0 [32]. Bars represent error standard (n = 5).
Mentions: The sampling effort curves (Fig. 2) indicated that the number of sequences analysed per sample was sufficient to provide coverage of the AM fungal diversity in the soils irrigated with WW and FW, since both curves reached the plateau. Four AMF sequence types were related to sequences from morphologically-described species (Glo G1 to Glomus trimulares, Glo G9 to Glomus macrocarpum, Glo G10 to Glomus deserticola and Glo G11 to Glomus aggregatum). The rest of the AMF sequence types were either related to uncultured glomalean species or were not related to any sequences of AMF in the database (Fig.1).

Bottom Line: After 43 years, the soil irrigated with fresh water (FW) had higher AMF diversity than soils irrigated with WW.Microbial activities were significantly higher in the soils irrigated with WW than in those irrigated with FW.Therefore, as no negative effects were observed on crop vitality and productivity, it seems that the ecosystem resilience gave rise to the selection of AMF species better able to thrive in soils with higher microbial activity and, thus, to higher soil fertility.

View Article: PubMed Central - PubMed

Affiliation: CSIC-Centro de Edafología y Biología Aplicada del Segura, Department of Soil and Water Conservation, Campus de Espinardo, Murcia, Spain. mmalguacil@cebas.csic.es

ABSTRACT
The effects of irrigation with treated urban wastewater (WW) on the arbuscular mycorrhizal fungi (AMF) diversity and soil microbial activities were assayed on a long-term basis in a semiarid orange-tree orchard. After 43 years, the soil irrigated with fresh water (FW) had higher AMF diversity than soils irrigated with WW. Microbial activities were significantly higher in the soils irrigated with WW than in those irrigated with FW. Therefore, as no negative effects were observed on crop vitality and productivity, it seems that the ecosystem resilience gave rise to the selection of AMF species better able to thrive in soils with higher microbial activity and, thus, to higher soil fertility.

Show MeSH