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@ARTICLE{VanGaelen:155362,
author = {Van Gaelen, Nele and Verschoren, Veerle and Clymans, Wim
and Poesen, Jean and Govers, Gerard and Vanderborght, Jan
and Diels, Jan},
title = {{C}ontrols on dissolved organic carbon export through
surface runoff from loamy agricultural soils},
journal = {Geoderma},
volume = {226-227},
issn = {0016-7061},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2014-04531},
pages = {387 - 396},
year = {2014},
abstract = {Dissolved organic carbon (DOC) is one of the most active
and mobile carbon pools, and thus an important component of
the global carbon cycle. Previous research on DOC transport
in the soil and on factors controlling DOC export towards
the river system focused mainly on forest and wetland areas,
with only limited information available from agricultural
soils. We carried out rainfall simulations on agricultural
field sites to identify the effect of soil properties, field
characteristics and hydrological conditions on DOC export by
surface runoff from loamy agricultural soils. Furthermore,
the temporal evolution of DOC concentrations and specific UV
absorbance (SUVA) values in runoff water during a rainfall
event was monitored. Additional rainfall simulations in the
lab allowed to investigate the effects of drop impact, crop
residue incorporation and drying–rewetting of the soil on
DOC concentrations and SUVA values in both runoff and
percolation water.DOC concentrations were the highest and
SUVA values the lowest at the start of a rainfall event,
both in runoff and percolation water. Afterwards, DOC
concentrations diminished and SUVA values rose to steady
values towards the end of the experiments. Overall, rainfall
conditions prior to the experiment showed to be a major
control on DOC concentrations and quality in runoff water
from agricultural fields. Smaller rainfall depths before the
experiment and lower initial soil moisture content led to
high concentrations of low aromatic DOC in the runoff water.
This drying–rewetting effect on DOC concentrations and
quality was also observed in the lab for percolation water.
For the range of considered soil types, only a limited
effect of soil and field characteristics on DOC
concentrations and quality in runoff was observed. The
effect of reduced tillage on DOC concentrations in surface
runoff was ambiguous, with effects differing between
experimental field sites.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {246 - Modelling and Monitoring Terrestrial Systems: Methods
and Technologies (POF2-246) / 255 - Terrestrial Systems:
From Observation to Prediction (POF3-255)},
pid = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000336467500039},
doi = {10.1016/j.geoderma.2014.03.018},
url = {https://juser.fz-juelich.de/record/155362},
}