 |
| Titel |
Short-term changes in soil Munsell colour value, organic matter content and soil water repellency after a spring grassland fire in Lithuania |
| VerfasserIn |
P. Pereira, X. Ubeda, J. Mataix-Solera, M. Oliva, A. Novara |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1869-9510
|
| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-04-11), S.209-225 |
| Datensatznummer |
250115266
|
| Publikation (Nr.) |
 copernicus.org/se-5-209-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Fire is a natural phenomenon with important implications on soil properties.
The degree of this impact depends upon fire severity, the ecosystem affected,
topography of the burned area and post-fire meteorological conditions. The
study of fire effects on soil properties is fundamental to understand the
impacts of this disturbance on ecosystems. The aim of this work was to study
the short-term effects immediately after the fire (IAF), 2, 5, 7 and
9 months after a low-severity spring boreal grassland fire on soil colour
value (assessed with the Munsell colour chart), soil organic matter content
(SOM) and soil water repellency (SWR) in Lithuania. Four days after the fire
a 400 m2 plot was delineated in an unburned and burned area with the
same topographical characteristics. Soil samples were collected at 0–5 cm
depth in a 20 m × 20 m grid, with 5 m space between sampling
points. In each plot 25 samples were collected (50 each sampling date) for a
total of 250 samples for the whole study. SWR was assessed in fine earth
(< 2 mm) and sieve fractions of 2–1, 1–0.5, 0.5–0.25 and < 0.25 mm
from the 250 soil samples using the water drop penetration time (WDPT)
method. The results showed that significant differences were only identified
in the burned area. Fire darkened the soil significantly during the entire
study period due to the incorporation of ash/charcoal into the topsoil
(significant differences were found among plots for all sampling dates). SOM
was only significantly different among samples from the unburned area. The
comparison between plots revealed that SOM was significantly higher in the
first 2 months after the fire in the burned plot, compared to the unburned
plot. SWR of the fine earth was significantly different in the burned and
unburned plot among all sampling dates. SWR was significantly more severe
only IAF and 2 months after the fire. In the unburned area SWR was
significantly higher IAF, 2, 5 and 7 months later after than 9 months later.
The comparison between plots showed that SWR was more severe in the burned
plot during the first 2 months after the fire in relation to the unburned
plot. Considering the different sieve fractions studied, in the burned plot
SWR was significantly more severe in the first 7 months after the fire in
the coarser fractions (2–1 and 1–0.5 mm) and 9 months after in the finer
fractions (0.5–0.25 and < 0.25 mm). In relation to the unburned plot,
SWR was significantly more severe in the size fractions 2–1 and
< 0.25 mm, IAF, 5 and 7 months after the fire than 2 and 9 months
later. In the 1–0.5- and 0.5–0.25 mm-size fractions, SWR was significantly
higher IAF, 2, 5 and 7 months after the fire than in the last sampling date.
Significant differences in SWR were observed among the different sieve
fractions in each plot, with exception of 2 and 9 months after the fire in
the unburned plot. In most cases the finer fraction (< 0.25 mm) was more
water repellent than the others. The comparison between plots
for each sieve fraction showed significant differences in all cases IAF, 2
and 5 months after the fire. Seven months after the fire significant
differences were only observed in the finer fractions (0.5–0.25 and
< 0.25 mm) and after 9 months no significant differences were
identified. The correlations between soil Munsell colour value and SOM were
negatively significant in the burned and unburned areas. The correlations
between Munsell colour value and SWR were only significant in the burned plot
IAF, 2 and 7 months after the fire. In the case of the correlations between
SOM and SWR, significant differences were only identified IAF and 2 months
after the fire. The partial correlations (controlling for the effect of SOM)
revealed that SOM had an important influence on the correlation between soil
Munsell colour value and SWR in the burned plot IAF, 2 and 7 months after
the fire. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|