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Minerva Biotecnologica 2009 September;21(3):153-9

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Arbuscular mycorrhizal fungi of cotton fields with different cropping periods in an arid ecosystem in South Xinjiang, China

Zhang H. Y., Gong M. F., Sun H. Z., Luan F. G., Zhang L. L.

1 Key Laboratory of Protection and Uitilization of Biological Resources in Tarim Basin, Xinjiang Production and Construction Corps Alar, Xinjiang, China 2 College of Life sciences, Tarim University, Alar, Xinjiang, China


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Aim and methods. In the present study, the arbuscular mycorrhizal fungi (AMF) in the soil of cotton field with different cropping periods ranging from 1 to 25 years were investigated.
Results. The AMF AMF AMF A n spore abundance showed regular reduction and increase with the continuous cropping periods and remained at a high level from the preploughing to the bud stages in the cotton fields continuously cropped for 20 years. The correlations between soil physicochemical properties and AMF spore abundance were not significant but the former showed some relationship with the mycorrhizal colonization status in cotton. A significant positive correlation existed between K+ and mycorrhizal colonization percentage, mycorrhizal colonization density and colonization density of mycorrhizal roots (P<0.01). Available Fe2+ was highly significantly correlated with mycorrhizal colonization percentage of roots and arbuscular density of mycorrhizal roots (P<0.01) and was positively correlated with mycorrhizal colonization density of roots and colonization density of mycorrhizal roots (P<0.05).
Conclusion. Path coefficient analysis showed that total salt content was the main factor that directly influenced the AMF spore abundance and mycorrhizal colonization status.

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