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@ARTICLE{Kooijman:888084,
author = {Kooijman, Annemieke and Morriën, Elly and Jagers op
Akkerhuis, Gerard and Missong, Anna and Bol, Roland and
Klumpp, Erwin and Hall, Rutger and Til, Mark and Kalbitz,
Karsten and Bloem, Jaap},
title = {{R}esilience in coastal dune grasslands: p{H} and soil
organic matter effects on {P} nutrition, plant strategies,
and soil communities},
journal = {Ecosphere},
volume = {11},
number = {5},
issn = {2150-8925},
address = {Ithaca, NY},
publisher = {ESA},
reportid = {FZJ-2020-04661},
pages = {e03112},
year = {2020},
abstract = {Soil organic matter (SOM) and pH are key ecosystem drivers,
influencing resilience to environmental change. We tested
the separate effects of pH and SOM on nutrient availability,
plant strategies, and soil community composition in
calcareous and acidic Grey dunes (H2130) with low,
intermediate, and/or high SOM, which differ in sensitivity
to high atmospheric N deposition. Soil organic matter was
mainly important for biomass parameters of plants, microbes,
and soil animals, and for microarthropod diversity and
network complexity. However, differences in pH led to
fundamental differences in P availability and plant
strategies, which overruled the normal soil community
patterns, and influenced resilience to N deposition. In
calcareous dunes with low grass‐encroachment, P
availability was low despite high amounts of inorganic P,
due to low solubility of calcium phosphates and strong P
sorption to Fe oxides at high pH. Calcareous dunes were
dominated by low‐competitive arbuscular mycorrhizal (AM)
plants, which profit from mycorrhiza especially at low P. In
acidic dunes with high grass‐encroachment, P availability
increased as calcium phosphates dissolved and P sorption
weakened with the shift from Fe oxides to Fe‐OM complexes.
Weakly sorbed and colloidal P increased, and at least part
of the sorbed P was organic. Acidic dunes were dominated by
nonmycorrhizal (NM) plants, which increase P uptake through
exudation of carboxylates and phosphatase enzymes, which
release weakly sorbed P, and disintegrate labile organic P.
The shifts in P availability and plant strategies also
changed the soil community. Contrary to expectations, the
bacterial pathway was more important in acidic than in
calcareous dunes, possibly due to exudation of carboxylates
and phosphatases by NM plants, which serve as bacterial food
resource. Also, the fungal AM pathway was enhanced in
calcareous dunes, and fungal feeders more abundant, due to
the presence of AM fungi. The changes in soil communities in
turn reduced expected differences in N cycling between
calcareous and acidic dunes. Our results show that SOM and
pH are important, but separate ecosystem drivers in Grey
dunes. Differences in resilience to N deposition are mainly
due to pH effects on P availability and plant strategies,
which in turn overruled soil community patterns.},
cin = {IBG-3},
ddc = {570},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000538094900025},
doi = {10.1002/ecs2.3112},
url = {https://juser.fz-juelich.de/record/888084},
}