Presentazione Pini - Febbraio 2015 al Plant and Food
20
Tolerance and ecophysiological strategies of Iberian pines at juvenile stages towards drought, low temperatures and nutrient availability
-
Upload
paolo-zuccarini -
Category
Documents
-
view
78 -
download
0
Transcript of Presentazione Pini - Febbraio 2015 al Plant and Food
Tolerance and ecophysiological strategies of Iberian pinesat juvenile stages towardsdrought, low temperaturesand nutrient availability
Spatial segregation of pine species in the Iberian Peninsula: the role of roots
Aridity gradient
Lowland Mediterranean
pines
High mountain pines ?
High mountain pines
Introduction
?
Abiotic stress
elicit
Tolerance, survival rates,
growth
Climatic conditions
Functional response
Edaphic conditions
Introduction
?
The role of root responses:
Root growth and respiration patterns, under two different water regimes, along one year period
Root hydraulic responses to temperatures ranging from 30 to 0°C
Introduction
A
B
Materials and methods
Root hydraulic responses
Rh= (P x L)/J
Results
Results
2-5 timeshigher slopes
lowlandpines
=Conclusions
Height= 1.2 m Width=0.5 m
Length=0.6 m
Rhizotrons:
Sandy substrate
Six plants per species
Two water regimes
Materials and methodsRoot growth and respiration
Materials and methods
1. Root length at different depths (Images analyzed with WinRHIZO)
2. Root respiration each month
3. Root mass at the end of the study
Root growth and respiration
Results
Fall 2013 Winter 2014 Spring 2014 Summer 2014 Fall 2014
Root growth
0
30
60
90
120
0 30 60 90 120
Length (cm)
Dept
h (c
m)
0
30
60
90
120
0 30 60 90 120
Length (cm)
0
30
60
90
120
0 30 60 90 120
Length (cm)
P. sylvestris P. pinaster P. halepensis
0
30
60
90
120
0 30 60 90 120
Dept
h (c
m)
Length (cm)
0
30
60
90
120
0 30 60 90 120
Length (cm)
0
30
60
90
120
0 30 60 90 120
Length (cm)
Fall 2013 Winter 2014 Spring 2014 Summer 2014 Fall 2014
Root growth
Results
P. sylvestris P. pinaster P. halepensis
0
30
60
90
120
0 30 60 90 120
Length (cm)
0
30
60
90
120
0 30 60 90 120
Length (cm)
Fall 2013 Winter 2014 Spring 2014 Summer 2014 Fall 2014
Root growth
Results
P. sylvestris P. pinaster P. halepensis
ab
0
50
100
150
200
250
300
350
P. sylvestris P. pinaster P. halepensis
Days
to re
ach
30 cm
a
b
Root growth
1) Speed
2) Biomass
Results
0
50
100
150
200
250
300
350
P. sylvestris P. pinaster P. halepensis
Root
bio
mas
s (g)
ab
b
a
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2Ju
n Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov
Dec
Jan
Feb
Mar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov
Dec
Jan
Feb
Mar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov
Dec
Jan
Feb
Mar Apr
May
2013 2014
µmol
·m-2
·s-1
Pinus nigra
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
Pinus halepensisPinus pinaster Pinus pinea
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
00.5
11.5
2
Jun Jul
Aug
Set
Oct
Nov De
cJa
nFe
bM
ar Apr
May
2013 2014
µmol
·m-2
·s-1
Pinus sylvestris
DOSE 2
DOSE 1
Results
P.halepensis > P.pinaster ≥ P. pinea >> P.nigra ≥ P.sylvestris
Conclusions
Mediterranean pines
High mountain pines
Lower, shallow root growth
Higher root hydraulic resistance
Higher and deeper root growth
Lower root hydraulic resistance
Lower competitive capacity in conditions of low water availability: experiencing stronger water stress
More sensitive to frost induced embolisms
General Conclusions
Differences at root level in hydraulic response to temperature, growth patterns and respiration patterns are in accordance with the present patterns of spatial segregation
These data can help to predict the potential distribution of these species in Spain under future climatic change conditions.
Thank you!
