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Rivers want to break free
Gilles PinayRiverLy, Lyon, France
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Δ1
4 C-D
OC
Bu
tma
n e
t a
l. 2
01
4U
SG
S 2
01
5
Ph
osp
ha
te E
xtr
actio
n (
Mt)
Els
er
an
d B
en
nett
20
11
Ag
e d
ecre
ase
Vitu
ose
k e
t a
l. 1
99
7
Fritz Haber Carl Bosch
Context: Human alteration of C,N,P cycles
http://upload.wikimedia.org/wikipedia/commons/1/1e/Fritz_Haber.pnghttp://www.makingthemodernworld.org.uk/stories/the_second_industrial_revolution/05.ST.01/img/IM.1036_zp.jpghttps://www.bing.com/images/search?q=logo+irstea&id=16BC197B1C6B807BF48F38A8A2458AA777864964&FORM=IQFRBA
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Gruber & Galloway , Nature 2008
Consequences
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Seitzinger et al. 2006
Nitrogen processing and retention
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Tabacchi et al. 1998 Tabacchi et al. 1998
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Pinay et al. 1995 & 2000
0
10
20
30
40
0 20 40 60 80 100 120
Soil silt + clay (%)
Den
itri
fica
tio
n(N
g m
-2 m
on
th-1
)
Pinay et al., Biogeochemistry, 1995 & 2000
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« no river needs more than one bed »
Rhine River transformation 1842-1876
Johann Gottfried Tulla
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EW
EW 2
KGT
KW
ST
EW
EW 2
KGT
KW
ST
N2 / N20
0
10
20
30
STKWKGTEW2EWUL1
N2
/ N
2O
Potential denitrification
0
1
2
3
4
5
6
STKWKGTEW2EWUL1
N (
µg
/g/h
)
- +Degree of connectivityDegree of connectivity
-
+
Danube River Welti et al. Ecological Engineering, 2012Tritthart et al. Environmental Modelling & Software, 2011
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https://www.bing.com/images/search?q=logo+irstea&id=16BC197B1C6B807BF48F38A8A2458AA777864964&FORM=IQFRBA
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0
4
8
12
16
100 200 300 400 500
N µ
g l-1
mn
-1
denitrification
biological uptake
y = -0.0008Ln(x) + 0.0041r2 = 0.686
Groundwater travel time (minutes)
Pinay et al. River Research and Application, 2009
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Serre-Ponçon, France
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Cole et al. 2007
Datry et al. 2018
Carbon processing and retention
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Gruber & Galloway , Nature 2008
Conclusion
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Thank youfor your attention
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