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Flora species as a surrogate to understand ditches
hydrology sampling protocol
Fabrice Vinatier, Jean-Stéphane Bailly, Philippe Lagacherie
To cite this version:
Fabrice Vinatier, Jean-Stéphane Bailly, Philippe Lagacherie. Flora species as a surrogate to
un-derstand ditches hydrology sampling protocol. 4th International Multidisciplinary Conference on
Hydrology and Ecology (HydroEco 2013), May 2013, Rennes, France. �hal-01525783�
F
LORA SPECIES AS A SURROGATE TO
UNDERSTAND DITCHES HYDROLOGY
F
ABRICE
V
INATIER
1
, J
EAN
-S
TEPHANE
B
AILLY
1,2
AND
P
HILIPPE
L
AGACHERIE
1
1
UMR LISAH, F-34060, Montpellier, France
2
UMR LISAH (IRD-INRA-S
UP
A
GRO
), F-34060, M
ONTPELLIER
, F
RANCE
[email protected]
S
AMPLING PROTOCOL
The experimentation has been conducted in august 2012, on twelve species, selected for their visual facilities. An exhaustive
sampling of the occurence of each species along the ditch network have been assessed for a large watershed.
Alisma lanceolatum
Asparagus
acutifolius
Elytrigia juncea
Equisetum arvense
Lythrum portula
Mentha aquatica
Rumex crispus
Scirpus atrovirens
Sorghum halepense
Typha laxmannii
P
ROBLEM
Hydrological functionning of watersheds is assessed using
process-based approaches.
These approaches necessitate a
large sampling effort for parameterization, this effort
increas-ing with the scale considered. Therefore, it is necessary to find
sampling methods that are adapted to landscape scale where
the ecosystem services occur. We presented here how the
sam-pling of flora species can help hydrologists to parameterize
their models, by adressing two questions :
1. Is the spatial distribution of flora species related to
ge-omorphology ?
2. Is it possible to infer parameters for hydrological
mod-els on the basis of flora species distribution ?
G
EOMORPHOLOGICAL AND PEDOLOGICAL VARIABLES
Geomorphological variables have been calculated on the basis of a Digital Elevation Model at a
5-meters resolution.
Pedological zones are issued from an exhaustive survey of the zone.
Digital Elevation Model
Slope in percentage
Direction of each pixel
Multiresolution Index of Valley Bottom Flatness
Analytical Hillshading algorithm
Pedo 1 Pedo 10 Pedo 11 Pedo 12 Pedo 13 Pedo 14 Pedo 15 Pedo 16 Pedo 17 Pedo 18 Pedo 19 Pedo 2 Pedo 20 Pedo 3 Pedo 4 Pedo 5 Pedo 6 Pedo 7 Pedo 8 Pedo 9
Pedological zones
We applied a Random Forest Model on each of the given collected species. The variable to
ex-plain is the occurence of each species on a 5mx5m grid raster. The exex-plaining variables are the
environnemental variables described above.
For each species, we selected the value of the coefficient for each explaining variable only if the
corresponding p-value of the test is significative,
MNT
slope
aspect
mr
vbf
hillshade
ocsol
pedology
Arundo.donax
Typha.laxmannii
Rumex.crispus
Lythrum.portula
Sorghum.halepense
Scirpus.atrovirens
Elytrigia.juncea
Mentha.suaveolens
Mentha.aquatica
Asparagus.acutifolius
Equisetum.arvense
Alisma.lanceolatum
The most influential variables are the pedological zones and the land uses around the ditches.
Some variables, such as the MRVBF (Multiresolution Index of Valley Bottom Flatness) help
differenciate species.
E
COLOGICAL NICHES
The fundamental niche is an n-dimensional hypervolume, where the dimensions are
environ-mental conditions and the resources that define the requirements of an individual or a species to
practise "its" way of life. We make the hypothesis here that the realized niche, i.e. the occurence
of species on the ditch network is the same as the fundamental niche.
The ecological preferences of each species in terms of:
L
Luminosity
T
Temperature
C
Climate
HA
Wind
HE
Water
R
Acidity
N
Azote
S
Salinity
Tx
Granulometry
MO
Soil
is illustrated by:
5 6 7 8 9Luminosity
5.0 5.5 6.0 6.5 7.0 7.5 8.0Temperature
1 2 3 4 5Climate
3 4 5 6 7 8 9Wind
4 5 6 7 8 9Water
4.0 4.5 5.0 5.5 6.0 6.5 7.0Acidity
5.0 5.5 6.0 6.5 7.0 7.5 8.0Azote
0 1 2 3 4 5 6Salinity
1 2 3 4 5Granulometry
1 2 3 4 5 6 7 8Soil
L
T
C
HA
HE
R
N
S
Tx
MO
Arundo donax
Typha laxmannii
Rumex crispus
Lythrum portula
Sorghum halepense
Scirpus atrovirens
Elytrigia juncea
Mentha suaveolens
Mentha aquatica
Asparagus acutifolius
Equisetum arvense
Alisma lanceolatum
hyperheliophiles heliophiles intermediaires intermediaires heliophiles heliophiles hyperheliophiles heliophiles intermediaires intermediaires intermediaires intermediaires mesomediterraneennes mesomediterraneennes planitiaires a monta gnar desplanitiaires thermophiles, thermoatlantiques, thermocontinentales, submediterraneennes, supramediterraneennes eur
ymediterraneennes, mediterraneo−atlantiques planitiaires thermophiles, thermoatlantiques, thermocontinentales,
submediterraneennes, supramediterraneennes mesomediterraneennes
planitiaires thermophiles, thermoatlantiques, thermocontinentales, submediterraneennes, supramediterraneennes planitiaires a monta gnar des mesomediterraneennes planitiaires a monta gnar des planitiaires a monta gnar des oceaniques hyper oceaniques intermediaires suboceaniques suboceaniques oceaniques marines a maritimes oceaniques intermediaires oceaniques intermediaires intermediaires intermediaires intermediaires intermediaires intermediaires aer omeso xer ophiles intermediaires intermediaires intermediaires aer ohydr ophiles intermediaires intermediaires intermediaires
amphibies saisonnieres (heloph ytes e
xondes une par
tie minoritaire de l...annee)
amphibies saisonnieres (heloph ytes e
xondes une par
tie minoritaire de l...annee) hygr ophiles (cour tement inondab les, en semaines) hygr ophiles (cour tement inondab les, en semaines) mesoh ydriques hygr ophiles (cour tement inondab les, en semaines) mesoh ygr ophiles hygr ophiles (cour tement inondab les, en semaines) hydr
ophiles (longuement inondab les, en mois) meso xer ophiles meso xer ophiles amphibies permanentes (heloph
ytes semiemer
ges a base toujour s no yee) neutr ophiles neutr ophiles intermediaires intermediaires neutr ophiles acidoc lines (pH<5,5) neutr ophiles neutr oclines (pH>5,5) intermediaires neutr oclines (pH>5,5) intermediaires neutr ophiles eutr ophiles intermediaires eutr ophiles mesotr ophiles intermediaires mesotr ophiles mesoeutr ophiles mesoeutr ophiles mesoeutr ophiles mesotr ophiles mesoeutr ophiles mesotr ophiles ne suppor tant pas le sel hyper
oligohalines, [0−0,1% Cl−] mesohalines, [0,7−0,9% Cl−]
ne suppor tant pas le sel hyper
oligohalines, [0−0,1% Cl−] ne suppor
tant pas le sel hyper
oligohalines, [0−0,1% Cl−] mesohalines, [0,7−0,9% Cl−]
ne suppor tant pas le sel hyper
oligohalines, [0−0,1% Cl−] ne suppor
tant pas le sel hyper oligohalines, [0−0,1% Cl−] argile intermediaire argile limon sab le fin argile sab le gr ossier intermediaire argile sab le gr ossier limon argile anmoor , gyttja anmoor , gyttja anmoor , gyttja mull actif mull acide lithosol, arenosol anmoor , gyttja anmoor , gyttja mull carbonate mull actif anmoor , gyttja
