NDLI: Wildfire impacts on hillslope sediment and phosphorus yields

Content Provider	Springer Nature Link
Author	Blake, William H. Theocharopoulos, Sideris P. Skoulikidis, Nikos Clark, Paul Tountas, P. Hartley, Richard Amaxidis, Yorgos
Copyright Year	2010
Abstract	The impact of wildfire on (a) slope hydrological processes, (b) soil erodibility, and (c) post-fire hillslope sediment and phosphorus (P; dissolved and particulate) yields are quantified for natural forest areas of the burned Evrotas River basin, Peloponnese, Greece. Further, the geochemical partitioning of P in burned and unburned sediment is evaluated by sequential extraction to assess potential bioavailability of particulate P (PP) in downstream aquatic ecosystems.A series of field-based rainfall simulation and infiltration experiments were undertaken in burned and unburned terrain of contrasting vegetation and soil type, after severe wildfires in summer 2007. Resulting water and sediment samples were analyzed for P concentration to permit calculation of hillslope yields for 20, 40, and 60 mm h$^{–1}$ rainfall events. Samples of soil were collected from each site type for physical and geochemical analyses.Plot-scale rainfall simulation experiments and measurements demonstrate enhanced runoff and erosion rates in burned terrain. While dissolved P concentrations in runoff from burned terrain are elevated (0.21 ± 0.09 mg l$^{–1}$) against background levels (0.01 ± 0.01 mg l$^{–1}$) and exceed European water quality guidelines, PP represents 99% of the severely burned hillslope P yield (2.32 ± 1.63 kg ha$^{–1}$ for a 15-min rainfall event). Sequential extraction data demonstrate that up to 20% of total PP in burned sediment is potentially bioavailable and that bioavaliable PP yields are two orders of magnitude greater than dissolved P yields.Release of P from eroded sediment stored in downslope/downstream sink zones may protract the post-fire risk to downstream resources. Quantification of PP partitioning in eroded sediment is a key requirement when assessing the downstream impacts of wildfire.
Starting Page	671
Ending Page	682
Page Count	12
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	10
Issue Number	4
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bioavailability Erosion Greece Particle size Phosphorus Sediment Sequential extraction Water quality Wildfire Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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