Restoration:
A theoretical framework in/for Brazil
Key 4 - 30/08/2012 16:10 – 16:50h
Dr. Sergius Gandolfi- sgandolf@usp.br
Laboratório de Ecologia e Restauração Florestal - Departamento de Ciências Biológicas Escola Superior de Agricultura “Luiz de Queiroz” / Universidade de São Paulo
UNICAMP - Campinas, SP, Brazil from 30 August to 4, 2012
Workshop
"Advances in ecological frameworks - towards process-
oriented conservation and
management "
Universidade de São Paulo Escola Superior de
Agricultura “Luiz de Queiroz”
Departamento de Ciências
Biológicas Laboratório de Ecologia e
Restauração Florestal
www.lerf.esalq.usp.br
The theory and model that I will present summarizes
30 years of work with natural forests and more than 20 years of work
in forest restoration performed in our lab
High Diversity Forest Restoration in Degraded Areas: Methods and Projects in Brazil. Ed. Nova Publishers, USA. 2007.
partly published
in a book
and in two
recent papers
TO BE SUBMITTED IN OCTOBER Concepts and Questions
Frontiers in Ecology and Environment
A Theory to Improve Tropical Forest Restoration
Sergius Gandolfi 1* , Ricardo R Rodrigues 1 , André G Nave 1 , and Pedro H S Brancalion 1
MODEL THEORY
and now in a new paper
Ecological Succession
is the natural process of ecosystem self-repair
Restoration Methods
are active interventions to assist recovery of degraded ecosystems
a complex process that mix restoration actions and sucessional processes working together and/or sequentially in a same place
RESTORATION PROCESS
Successional process does not have an aim, schedule, cost-effectiveness limitations,
or a defined objective
And may presents progressive and retrogressive
trajectories and stationary stable states
Restoration, by contrast, must occur at a defined time, with reasonable costs, and
have to attain defined conservation objectives
So for us Restoration aims to increase the PREDICTABILITY
of community building process
favoring progressive trajectories and avoiding
stationary stable states, and regressive trajectories
Or in a simple way
To Remove the factor of degradation
To apply some restoration method
And wait for the enrichment
The theory here presented is only adequate to describe restoration
processes in:
Moist Seasonal Semideciduous Forests
AND IN
Tropical Moist or Rain Forests
We believe that restoration process
involves three distinct phases
Structuration
Consolidation
Maturation
RESTORATION OF TROPICAL FORESTS
Structuration
is the formation
of a forest habitat
Structuration
Consolidation
Maturation
RESTORATION OF TROPICAL FORESTS
Consolidation
is the creation of new canopy
and the maintenance of forest habitat to permit restoration process
continues
Structuration
Consolidation
Maturation
RESTORATION OF TROPICAL FORESTS
MATURATION
Is the gradual accumulation of species, materials, and
processes
making the restored forests
be similar to mature ones
We propose a Box-Arrow Model
to describe it
Time
X
Throughout the tropics, many sites are degraded (X)
like pasture
Time
X
or sugar-cane plantations in river banks (X)
Time
X
0
That can remain in degraded condition for decades, in special, in landscapes
where forest fragments are few, distant and degraded (Arrow 0)
FOREST TREE SPECIES
PIONEERS
light demanding fast growing
short-lived (5~20 years)
SECONDARY
shade tolerant
Intermediate growth rates intermediate life spans
(~40-60 years)
CLIMAX
shade tolerant slow growing
long-lived
(~80-150 years)
Time
X
0
RIFD
STRUCTURATION STRUCTURATION PHASE Begins with the
Removal and the isolation the area from degraded factors
(Arrow RIDF )
Time 1
X
0
RIFD
STRUCTURATION AND WITH NATURAL OR ASSISTED INTRODUCTION OF FAST-GROWING
TREE SPECIES (Arrow 1)
Time P
P P _P_
1
_P_
P S
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION THAT CAN CREATE DIFFERENT
INITIAL FOREST COMMUNITIES
DOMINATED BY PIONEERS (A-H)
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION after canopy creation shade tolerant
species may be Natural or Asssited
introduced in the understory (Arrow 2)
MOIST SEASONAL SEMIDECIDUOUS FOREST IN RESTORATION ISOLATED FROM FRAGMENTS ( Santa Bárbara do Oeste , SP)
THE STRUCTURE OF THESE FORESTS DEVELOPS,
BUT IN FRAGMENTED LANDSCAPES THEY CAN REMAIN YEARS WITHOUT SPECIES IN ITS UNDERSTORY
10 YEARS
MOIST SEASONAL SEMIDECIDUOUS FOREST IN RESTORATION NEXT TO FOREST FRAGMENTS ( JACIARA, MT)
BUT, IN FAVORABLE LANDSCAPES FOREST STRUCTURE AND UNDERSTORY MAY DEVELOP VERY FAST
10 YEARS
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
But in some cases
STRUCTURATION MAY FAIL
AFTER SOME YEARS IF CANOPY FAST-GROWING
TREE SPECIES DO NOT ADAPT TO LOCAL
CONDITIONS ( Arrow 3)
3
So to prevent the causes of early mortality and to increase predictability it is
crucial :
TO USE THE ORIGINAL LOCAL FOREST SPECIES
( THE REFERENCE ECOSYSTEM )
because they are pre-
adapted to the local climate, soils, natural disturbance regime, and to negative and
positive interactions with
other local species
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
In some situations initial communities with open canopies (C-D) can maintain themselves for long time by
favoring pioneers self- regeneration (arrow 4)
3
P s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
3
During Structuration natural or assisted understory
enrichment may convert one kind of forest community in to
another (Arrow 5)
Time 5
5
5
P s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4 6
3
BUT STRUCTURATION MAY ALSO FAIL
If canopy pioneers inhibit understory species and die after some years
(Arrow 6)
e g.: Maricá (Mimosa bimucronata)
Time 5
5
5
In summary: STRUCTURATION PHASE
normally results in the elimination of competing plants by the creation of a canopy and a forest habitat, and
MOIST SEASONAL SEMIDECIDUOUS FOREST IN RESTORATION (ORLÂNDIA, SP)
2,5 YEARS
MOIST SEASONAL SEMIDECIDUOUS FOREST IN RESTORATION NEXT TO A FOREST FRAGMENT (ORLÂNDIA , SP)
favors the gradual development of forest structure
3,5 YEARS
The end of Structuration and beginning of Consolidation occurs when canopy fast growing pioneers trees become
senescent and begin to die
CONSOLIDATION PHASE
is a critical step because secondary species having longer life spans than pioneers, may form a new canopy that will survive for decades, maintaining the forest habitat until the climax species slowly reach the canopy
CANOPY FORMED BY
SECONDARY SPECIES
5
5 5
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
6 6
6 3
CONSOLIDATION
But Restoration process may also fail during Consolidation
if secondary species are absent in the
understory to grow until the canopy
(Arrow 6)
CONSOLIDATION FAILURE
CONSOLIDATION FAILURE
Or
if a single or a few fast growing tree species tend to dominate the Structuration Canopy
favoring massive
synchronous death of pioneers
AND
5
5 5
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4 6
6
6 3
CONSOLIDATION
If secondary species are present,
- but in low density,
– or are poorly scattered in space,
– or are in young age, causuing the loss of canopy, biomass,
structure, species and
interactions accumulated
during the initial years
(Arrow 6)
CONSOLIDATION FAILURE
MOIST SEASONAL SEMIDECIDUOUS FOREST IN RESTORATION ISOLATED FROM FRAGMENTS ( Santa Bárbara do Oeste , SP)
The Canopy in Structuration Phase
The Canopy in Consolidation Phase
13 YEARS
SECONDARY SPECIES ARE PRESENT,
BUT IN LOW DENSITY AND IN AN INADEQUATE AGE, AND
SPACE ARRANGEMENT
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
5
5 5 6
6
6 3
BUT IF SECONDARY CANOPY SPECIES ARE PRESENT IN THE UNDERSTORY WITH ADEQUATE AGE, DENSITY AND
SPACE ARRANGEMENT
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
J
S
I S 5
5 5 6
6
6 3
CONSOLIDATION
7
7
THEN A NEW CANOPY DOMINATED BY
SECONDARY SPECIES WILL
BE CREATED
(ARROW 7)
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
J
S s c o
S
I s o 5
5 5 6
6
6 3
CONSOLIDATION
7
8 8
7
with time more species may be Natural or Asssited introduced in
the understory
(Arrow 8)
Time P
s c o
P c o
P s o _P_
p s o
1 2
_P_
p o
P S s c o
X
0
B
A
RIFD
F D
E
H C
G
P
P
STRUCTURATION
4 4
J
S s c o
S
I s o 5
5 5 6
6
6 3
CONSOLIDATION
7
8 8
7
8
Changing forest
communities
(Arrow 8)
We believe that canopy
composition and richness are
fundamental to forest
development
500 100 150200 250300 350400 450500 550600 650 700750 800850 900 1000950 1050 11001150 12001250 13001350 14001450 15001550 16001650 1700
930 948 1006 1024 1042 1100 1118 1136 1154 1212 1230 1248 1306 1324 1342 1400 1418 1436 1454 1512 1530 1548 1606 1624 1642 1700
HORA PPFD (µmol.m-2.s-1)
07/07/94 06/10/94
FIGURA 44:Andamento diário da PPFD (µmol.m-2.s-1) numa área de sub-bosque sob dossel perenifólio (sensor A3) no dia 07/07/1994, quando não existiam árvores decíduas no dossel da área A e no dia 06/10/1994, quando algumas árvores do dossel estavam decíduas.
0 600 1200 1800
930 1300 1630
Time of Day (Hours) PPFD (μmol.m-2.s-1)