Influence of fallow periods on the vertical distribution of roots, arbuscular mycorrhizae and root hairs in Venezuelan Andean paramos
Keywords:
períodos de descanso, sucesión, raíces, micorrizas arbusculares, pelos radicales, páramo, Andes, VenezuelaAbstract
The effect of fallow periods on the vertical distribution of root and rootlet phytomass, on arbuscular mycorrhiza (AM) colonization rate and on the proportion of rootlets showing root hairs are analyzed in two climatic and ecologically contrasting Venezuelan Andean paramos. The results show that at Gavidia, a less climate and soil stressed Andean paramo, root and rootlet phytomass accumulate at 0 – 10 cm, while at Apure, a more stressed paramo, the distribution of root and rootlet phytomass is vertically more uniform, what perhaps is due to a natural defense against cold and desiccation. The AM colonization rate at Gavidia and Apure increased along the successional period, whereas in the same sense diminished the proportion or rootlets showing root hairs. In addition, at Apure, the AM colonization rates were higher (48 a 81 %) than in Gavidia (26 a 77 %), while the proportions of rootlets showing root hairs were smaller in Apure (2 a 31 %) than in Gavidia (3 a 54 %). That root hairs and arbuscular mycorrhizae are functionally excluding organs during a plant formation succession is reported by the first time worldwide.
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Copyright (c) 2002 Miguel Montilla, Ricardo Herrera-Peraza, Maximina Monasterio (Author)
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