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@ARTICLE{Missong:844758,
author = {Missong, Anna and Holzmann, Stefan and Bol, Roland and
Nischwitz, Volker and Puhlmann, Heike and v. Wilpert, Klaus
and Siemens, Jan and Klumpp, Erwin},
title = {{L}eaching of natural colloids from forest topsoils and
their relevance for phosphorus mobility},
journal = {The science of the total environment},
volume = {634},
issn = {0048-9697},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2018-02137},
pages = {305 - 315},
year = {2018},
abstract = {The leaching of P from the upper 20 cm of forest topsoils
influences nutrient (re-)cycling and the redistribution of
available phosphate and organic P forms. However, the
effective leaching of colloids and associated P forms from
forest topsoils was so far sparsely investigated. We
demonstrated through irrigation experiments with undisturbed
mesocosm soil columns, that significant proportions of P
leached from acidic forest topsoils were associated with
natural colloids. These colloids had a maximum size of 400
nm. By means of Field-flow fractionation the leached soil
colloids could be separated into three size fractions. The
size and composition was comparable to colloids present in
acidic forest streams known from literature. The composition
of leached colloids of the three size classes was dominated
by organic carbon. Furthermore, these colloids contained
large concentrations of P which amounted between 12 and
$91\%$ of the totally leached P depending on the type of the
forest soil. The fraction of other elements leached with
colloids ranged between $1\%$ and $25\%$ ($Fe$: 1–25\%;
$C_{org}$: 3–17\%; $Al$: <4\%; $Si$, $Ca$, $Mn$: all
<2\%). The proportion of colloid–associated P decreased
with increasing total P leaching. Leaching of total and
colloid-associated P from the forest surface soil did not
increase with increasing bulk soil P concentrations and were
also not related to tree species. The present study
highlighted that colloid-facilitated P leaching can be of
higher relevance for the P leaching from forest surface
soils than dissolved P and should not be neglected in soil
water flux studies.},
cin = {IBG-3 / ZEA-3},
ddc = {333.7},
cid = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-3-20090406},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29627554},
UT = {WOS:000433153600034},
doi = {10.1016/j.scitotenv.2018.03.265},
url = {https://juser.fz-juelich.de/record/844758},
}