IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Solar UV-B and warming affect decomposition and earthworms in a fen ecosystem in Tierra del Fuego, Argentina
Autor/es:
ZALLER JG; CALDWELL MM; FLINT SD; BALLARE CL; SCOPEL AL; SALA OE
Revista:
GLOBAL CHANGE BIOLOGY
Editorial:
Blackwell-Wiley
Referencias:
Año: 2009 vol. 15 p. 2493 - 2502
ISSN:
1354-1013
Resumen:
Combined effects of co-occurring global climate changes on ecosystem responses are
generally poorly understood. Here, we present results from a 2-year field experiment in a
Carex fen ecosystem on the southernmost tip of South America, where we examined the
effects of solar ultraviolet B (UVB, 280315 nm) and warming on above- and belowground
plant production, C:N ratios, decomposition rates and earthworm population
sizes. Solar UVB radiation was manipulated using transparent plastic filter films to create
a near-ambient (90% of ambient UVB) or a reduced solar UVB treatment (15% of ambient
UVB). The warming treatment was imposed passively by wrapping the same filter
material around the plots resulting in a mean air and soil temperature increase of about
1.2 1C. Aboveground plant production was not affected by warming, and marginally
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
effects of solar ultraviolet B (UVB, 280315 nm) and warming on above- and belowground
plant production, C:N ratios, decomposition rates and earthworm population
sizes. Solar UVB radiation was manipulated using transparent plastic filter films to create
a near-ambient (90% of ambient UVB) or a reduced solar UVB treatment (15% of ambient
UVB). The warming treatment was imposed passively by wrapping the same filter
material around the plots resulting in a mean air and soil temperature increase of about
1.2 1C. Aboveground plant production was not affected by warming, and marginally
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
fen ecosystem on the southernmost tip of South America, where we examined the
effects of solar ultraviolet B (UVB, 280315 nm) and warming on above- and belowground
plant production, C:N ratios, decomposition rates and earthworm population
sizes. Solar UVB radiation was manipulated using transparent plastic filter films to create
a near-ambient (90% of ambient UVB) or a reduced solar UVB treatment (15% of ambient
UVB). The warming treatment was imposed passively by wrapping the same filter
material around the plots resulting in a mean air and soil temperature increase of about
1.2 1C. Aboveground plant production was not affected by warming, and marginally
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
1C. Aboveground plant production was not affected by warming, and marginally
reduced at near-ambient UVB only in the second season. Aboveground plant biomass
also tended to have a lower C:N ratio under near-ambient UVB and was differently
affected at the two temperatures (marginal UVBtemperature interaction). Leaf decomposition
of one dominant sedge species (Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
Carex curta) tended to be faster at near-ambient
UVB than at reduced UVB. Leaf decomposition of a codominant species (Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.
Carex decidua)
was significantly faster at near-ambient UVB; root decomposition of this species tended
to be lower at increased temperature and interacted with UVB. We found, for the first
time in a field experiment that epigeic earthworm density and biomass was 36%
decreased by warming but remained unaffected by UVB radiation. Our results show
that present-day solar UVB radiation and modest warming can adversely affect ecosystem
functioning and engineers of this fen. However, results on plant biomass production
also showed that treatment manipulations of co-occurring global change factors can be
overridden by the local climatic situation in a given study year.