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Diversity of tree species growth responses to canopy openings : a spatially explicit approach

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Academic year: 2021

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(1)

Hérault B, Ouallet J, Baraloto C, Blanc L, Wagner F

Diversity of tree species growth

responses to canopy openings :

(2)

Objectives Methods Results Conclusions

Diversity of tree species growth responses to logging gaps

with regard to:

1. Distance to logging gaps

2. Area of logging gaps

(3)

Objectives Methods Results Conclusions

Paracou

experimental plots

(French Guiana)

Undisturbed forests 5 m² / ha – 10 trees 12 m² / ha – 40 trees 15 m² / ha – 45 trees Logging 1986-1988

(4)

Objectives Methods Results Conclusions

Canopy gaps 4.14 ha

(5)

Objectives Methods Results Conclusions Canopy gaps 4.14 ha 7.4% of Forest Area Damages area 15.63 ha 27.8% of Forest Area Logging gaps

(6)

14939 Trees

Objectives Methods Results Conclusions

Canopy gaps 4.14 ha 7.4% of Forest Area Damages area 15.63 ha 27.8% of Forest Area Skid Trails 7.39 ha 13.2% of Forest Area B undetermined + <30n 7463 trees A 43 species (>30n) 7476 trees

(7)

Objectives Methods Results Conclusions

B undetermined + <30n

7463 trees

Parameterize Alpha & Beta

(Hanski,1994)

(8)

Objectives Methods Results Conclusions

B undetermined + <30n

7463 trees

Parameterize Alpha & Beta

Alpha = 0.12

(9)

Objectives Methods Results Conclusions

B undetermined + <30n

7463 trees

Parameterize Alpha & Beta

0

2000 m² 50 m

(10)

Objectives Methods Results Conclusions

B undetermined + <30n

7463 trees

A 43 species (>30n)

7476 trees

Test Growth Species Responses

Parameterize Alpha & Beta

(Hanski,1994)

(11)

Objectives Methods Results Conclusions

0

Soil= binary variable (terra firme, seasonnaly flooded habitat)

RAP = DBH / 95th percentile DBH in control plots

(12)

Objectives Methods Results Conclusions 0 CELASTRACEAE Goupia glabra CHRYSOBALANACEAE Licania densiflora MYRISTICACEAE Iryanthera hostmannii SIMAROUBACEAE Simaba cedron CAESALPINIACEAE

(13)

Objectives Methods Results Conclusions

0

BIGNONIACEAE Jacaranda copaia

BOMBACACEAE Catostemma fragrans

CAESALPINIACEAE Eperua grandiflora

CHRYSOBALANACEAE Licania ovalifolia

EUPHORBIACEAE Hevea guianensis

LECYTHIDACEAE Couratari multiflora

MELIACEAECarapa procera

PAPILIONACEAEAndira coriacea

SAPOTACEAE Manilkara bidentata

STERCULIACEAE Theobroma subincanum

(14)

Objectives Methods Results Conclusions

0

VOCHYSIACEAE

Qualea rosea

(15)

Objectives Methods Results Conclusions 0 CAESALPINIACEAE Recordoxylo speciosum LECYTHIDACEAE Gustavia hexapetala MYRISTICACEAE Iryanthera sagotiana CHRYSOBALANACEAE

(16)

Objectives Methods Results Conclusions

0

CHRYSOBALANACEAE

Licania heteromorpha

(17)

Objectives Methods Results Conclusions 0 CHRYSOBALANACEAE Licania alba Licania membranacea LECYTHIDACEAE Eschweilera sagotiana Lecythis persistens CAESALPINIACEAE

(18)

Objectives Methods Results Conclusions 0 CHRYSOBALANACEAE Licania sprucei CLUSIACEAE Moronobea coccinea LECYTHIDACEAE Eschweilera congestiflora MYRISTICACEAE

(19)

Objectives Methods Results Conclusions 0 ANNONACEAE Oxandra asbeckii CAESALPINIACEAE Bocoa prouacensis Dicorynia guianensis LECYTHIDACEAE Eschweilera coriacea Eschweilera decolorans Lecythis poiteaui LINACEAE Hebepetalum humiriifolium SAPOTACEAE

(20)

Objectives Methods Results Conclusions

1. Strong effect of distance (< 10m )

to loggings gaps for 28

species

2. Weak effect of logging gaps area

3. High diversity of species growth responses

to logging

gaps and, for some species, the growth response was

strongly dependent on the species ontogeny

4. To enhance tree post-logging growth 

small logging gap

strategy

(21)

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