INVESTIGADORES
DIAZ Sandra Myrna
artículos
Título:
Mycorrhizal colonization mediated by species interactions in Arctic tundra
Autor/es:
URCELAY C; BRET-HARTE, M.S.; DÍAZ S.; CHAPIN FS III
Revista:
OECOLOGIA
Editorial:
SPRINGER
Referencias:
Año: 2003 vol. 137 p. 399 - 404
ISSN:
0029-8549
Resumen:
Abstract The Alaskan tussock tundra is a strongly
nutrient-limited ecosystem, where almost all vascular
plant species are mycorrhizal. We established a long-term
removal experiment to document effects of arctic plant
species on ecto- and ericoid mycorrhizal fungi and to
investigate whether species interactions and/or nutrient
availability affect mycorrhizal colonization. The treatments
applied were removal of Betula nana (Betulaceae,
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
nutrient-limited ecosystem, where almost all vascular
plant species are mycorrhizal. We established a long-term
removal experiment to document effects of arctic plant
species on ecto- and ericoid mycorrhizal fungi and to
investigate whether species interactions and/or nutrient
availability affect mycorrhizal colonization. The treatments
applied were removal of Betula nana (Betulaceae,
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
The Alaskan tussock tundra is a strongly
nutrient-limited ecosystem, where almost all vascular
plant species are mycorrhizal. We established a long-term
removal experiment to document effects of arctic plant
species on ecto- and ericoid mycorrhizal fungi and to
investigate whether species interactions and/or nutrient
availability affect mycorrhizal colonization. The treatments
applied were removal of Betula nana (Betulaceae,
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
Betula nana (Betulaceae,
dominant deciduous shrub species), removal of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
Ledum
palustre (Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of Ledum
(Ericaceae, dominant evergreen shrub species),
control (no removal), and each of these three treatments
with the addition of fertilizer. After 3 years of LedumLedum
removal and fertilization, we found that overall ectomycorrhizal
colonization in Betula was significantly reduced.
Changes in ectomycorrhizal morphotype composition
in removal and fertilized treatments were also
observed. These results suggest that the effect of Ledum
Changes in ectomycorrhizal morphotype composition
in removal and fertilized treatments were also
observed. These results suggest that the effect of Ledum
Betula was significantly reduced.
Changes in ectomycorrhizal morphotype composition
in removal and fertilized treatments were also
observed. These results suggest that the effect of LedumLedum
on Betula?s mycorrhizal roots is due to sequestration of
nutrients by Ledum, leading to reduced nutrient availability
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
nutrients by Ledum, leading to reduced nutrient availability
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
Betula?s mycorrhizal roots is due to sequestration of
nutrients by Ledum, leading to reduced nutrient availability
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
Ledum, leading to reduced nutrient availability
in the soil. In contrast, ericoid mycorrhizal colonization
was not affected by fertilization, but the removal of
Betula and to a lower degree of Ledum resulted in a
reduction of ericoid mycorrhizal colonization suggesting
a direct effect of these species on ericoid mycorrhizal
colonization. Nutrient availability was only higher in
fertilized treatments, but caution should be taken with the
interpretation of these data as soil microbes may
effectively compete with the ion exchange resins for the
nutrients released by plant removal in these nutrientlimited
soils.
reduction of ericoid mycorrhizal colonization suggesting
a direct effect of these species on ericoid mycorrhizal
colonization. Nutrient availability was only higher in
fertilized treatments, but caution should be taken with the
interpretation of these data as soil microbes may
effectively compete with the ion exchange resins for the
nutrients released by plant removal in these nutrientlimited
soils.
and to a lower degree of Ledum resulted in a
reduction of ericoid mycorrhizal colonization suggesting
a direct effect of these species on ericoid mycorrhizal
colonization. Nutrient availability was only higher in
fertilized treatments, but caution should be taken with the
interpretation of these data as soil microbes may
effectively compete with the ion exchange resins for the
nutrients released by plant removal in these nutrientlimited
soils.