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Biophysical survey in Congo (WP6)
Laurent Saint-André, Blandine Geneste, Joseph Yoka, G. Sola, S. Rodowsky,
Louis Mareschal
To cite this version:
Laurent Saint-André, Blandine Geneste, Joseph Yoka, G. Sola, S. Rodowsky, et al.. Biophysical survey
in Congo (WP6). ClimAfrica Project, 2014, Lomé, Togo. pp.12 slides. �hal-01269104�
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
WP6 – Biophysical survey in Congo
C.R.D.P.I
CENTRE DE RECHERCHE SUR LA DURABILITE ET LA
LA PRODUCTIVITE DES PLANTATIONS INDUSTRIELLES (EX UR2PI)
By Saint-André L1,4, Geneste B.1,2,
Yoka J.3, Sola G.1,2, Rodowsky S. 1,2,
Mareschal L. 1,2
Cirad, UMR ECO&SOLS, Montpellier F-34000, France
CRDPI, UR Plantes et Milieux, Pointe-Noire, République du
Congo
Université Marien Ngouabi, Brazzaville, République du
Congo
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
ClimAfrica Project Lomé
Site prospection and selection
(i)
panorama of the main ecosystems located
in the Kouillou region
(ii)
stratification of the vegetation types using
GIS, Digital Elevation Model (SRTM3
model) and Satellite images (Landsat 2001);
(iii)geographical delimitation of the basins of
interest;
(iv)
validation, by checking on the field, the
limits of the basins and the vegetation type
(savannah, eucalyptus plantations and
forests);
(v)
random selection of the points to be
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
2 zones inventoriées, 3
points par écosystème
et par zone
Kissoko – fortement
anthropisée
Tchizalamou –
faiblement anthropisée
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
ClimAfrica Project Lomé
In-situ data collection (WP6 and Biomass Campaign)
Height of the first branch
Cbase
C at the end
of the stem
Length of the
longest branch
Total height
Crown dimensions (longest diameter and its perpendicular)
Inventaires selon
protocoles climafrica
+ campagne de
biomasse pour Annona
senegalensis (16 felled
trees) and Anthocleista
schweinfurthii (23
felled trees)
+ analyses sol pour les
horizons 0-5, 5-10,
10-30, 30-60, 60-90, >90
– densité apparente,
ph-eau, C, N, P, K, Ca,
Mg, Al, Na, Fe, CEC,
cations échangeables,
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
In-sillico data compilation and calculation
Biomass equations were fitted using the NLP
procedure of the SAS software package.
Following the procedure described by
Saint-André et al. (2005)
AE
database
1 AE
>1AE
0 AE
> 1
Generic AE
0 Generic
AE
1 Generic
AE
Selection
Criteria
Expert
judgment
Calculation
Species specific AE?
(Henry et al, 2011 and grey literature for Africa
)
Generic AE?
(Chave 2005, Henry et al 2010, Gerhing et al. 2004)Comparison
SP AE
Average
AGB
Selection
Criteria
Selection criteria: lower biomass to ensure under-estimation of AGB
Differences between zones
(Tchizalamou, Kissoko), soil layers
and vegetation type on the soil
properties were assessed using
ANOVA (proc GLM, SAS software).
63% of the 644 trees, shrubs and
lianas were concerned by general
allometric equations (Chave et al.
2005, Gerhing et al. 2004)
27% of the individuals got specific
equations (local studies in CRDPI,
Saint-André et al. 2005, Henry et al.
2011)
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
ClimAfrica Project Lomé
Results: Development of Biomass equations for Annona senegalensis and
Anthocleista schweinfurthii
A C2H fixé, Annona a moins de
biomasse foliaire et de tronc
qu’Anthocleista et plus de branches
Au final, même modèle de biomasse
totale pour les deux essences
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
Results: Development of Biomass equations for Annona senegalensis and
Anthocleista schweinfurthii
Compartment Variable Model type ML Nb Param
Nb
Data AIC BIC R2 Equations
Branches Cbase Linear, all species -274.7 3 39 555.4 560.4 Branches Cbase Linear, species by species -254.5 6 39 521.0 531.0 Branches Cbase Non-linear, species by species -219.6 8 39 455.3 468.6 Branches Cbase^2.Height Non-linear, all species -222.6 4 39 453.2 459.8 Branches Cbase^2.Height Linear, all species -223.4 3 39 452.7 457.7 Branches Cbase^2.Height Non-linear, species by species -213.5 8 39 443.1 456.4
Branches Cbase Non-linear, all species -220.2 4 39 448.3 455.0 0.73 0.125397*Cbase^3.003428
Branches Cbase^2.Height Linear, species by species -208.4 7 39 430.8 442.5 0.78 Annona: 10.086962*C2H Anthocleista: 0.96037+3.788658*C2L
Leaves Cbase^2.Height Linear, all species -250.6 3 39 507.1 512.1 Leaves Cbase Non-linear, all species -243.2 5 39 496.3 504.6 Leaves Cbase Linear, all species -244.9 3 39 495.8 500.8 Leaves Cbase^2.Height Non-linear, all species -240.1 4 39 488.2 494.9 Leaves Cbase^2.Height Linear, species by species -232.4 8 39 480.8 494.1 Leaves Cbase^2.Height Linear, species by species -228.4 7 39 470.8 482.4 Leaves Cbase Linear, species by species -226.4 7 39 466.8 478.5
Leaves Cbase^2.Height Non-linear, species by species -224.4 8 39 464.9 478.2 0.63 Annona: 12.513333*C2H^0.624322 Anthocleista: 53.183186*C2H^0.514244
Leaves Cbase Non-linear, species by species -222.8 8 39 461.5 474.8 0.66 Annona: 1.51258*Cbase^1.632584 Anthocleista: 3.82613*Cbase^1.910314
Stems Cbase Linear, all species -235.1 3 35 476.2 480.8 Stems Cbase Linear, species by species -227.9 6 35 467.8 477.2 Stems Cbase Non-linear, all species -218.4 4 35 444.8 451.1 Stems Cbase Non-linear, species by species -198.9 9 35 415.7 429.7 0.93
Annona:
14.299567+0.003292*Cbase^4.060366
Anthocleista: 0.034017*Cbase^3.940894 Stems Cbase^2.Height Non-linear, all species -194.5 4 35 397.1 403.3
Stems Cbase^2.Height Linear, all species -194.7 3 35 395.3 400.0 0.89 8.231239*C2H
Stems Cbase^2.Height Linear, species by species -191.1 6 35 394.2 403.5
Stems Cbase^2.Height Non-linear, species by species -186.6 9 35 391.3 405.3 0.93
Annona:
9.461749+2.094412*C2H^1.278106 Anthocleista: 3.950735*C2H^1.268219
Total Cbase Linear, all species -283.1 3 39 572.1 577.1 Total Cbase Linear, species by species -268.6 7 39 551.2 562.9 Total Cbase Non-linear, all species -267.4 4 39 542.8 549.5
Total Cbase Non-linear, species by species -256.3 9 39 530.6 545.6 0.83 Annona: 0.601196*Cbase^2.743353
Anthocleista:
16.928601+1.22861*Cbase^2.763304 Total Cbase^2.Height Non-linear, species by species -251.8 8 39 519.5 532.9
Total Cbase^2.Height Linear, species by species -254.5 6 39 521.0 531.0 Total Cbase^2.Height Non-linear, all species -253.0 5 39 516.1 524.4
Total Cbase^2.Height Linear, all species -253.1 4 39 514.1 520.8 0.91 23.533502+24.955852*C2H
1
ClimAfrica - Climate change
predictions in Sub-Saharan Africa:
impacts and adaptation
ClimAfrica Project Lomé
Results: Biodiversity
Nom latin :Albizia ad ia nthifolia(Sc hum) W. F. WightÉc osystème(s): Lisière sava ne / forêt et forêts Sta tion(s) : Tc hiza lamou et Kissoko Observée da ns 17% des 29 sites Form e : Arbre
(a )
(b) Ce que d it la flore :
Arbre de 15 – 20 m, pouva nt a tteindre 36 m d e haut. Fût p ra tiquement d épourvu de c ontreforts, hab ituellement c ourt, a tteigna nt un d iamètre d e 96 c m. Éc orc e lisse, rarem ent finement fissurée, marron c la ir à ma rronrougeâ tre ou gris sombre.
Ra mea ux â gés glab res, bruns à lentic elles plus c laires. Ra mea ux jeunes pubesc ents, ja unes ou roussâ tres.
Feuilles c om posées, bip ennées, à 5 – 10 pa ires d e pennes. Pétiole d ensément pubesc ent jauneroussâ tre. Présenc e de stipules. 5 à 14 pa ires d e foliolules sessiles. Lim be pubesc ent, vert noirâ tre d essus, plus ou moins c lair d essous.
Infloresc enc e en épi c a pituliforme, axilla ire, solita ire ou fasc ic ulée ou en pa nic ule termina le.
Les fruits sont d es gousses d éhisc entes, ellip tiq ues à oblongues, d ensément finement p oilues, d e 10 à 17 c m d e long. Jac hères et zones de végéta tion sec onda ire.
Carac téristiq ues et usa ges :
Utilisé c omme bois d e c ha uffe et p iquets d e c ases.
Jeunes feuilles c onsommées c omme
légume d ans les pla teaux Tékés. (a) Port (b) Fruit (c ) Vue d’une feuille
(c )
Angiosp ermes / Eud ic otyléd ones supérieures / Rosid ées / Fa b iid ées / Fa ba les / Fa ba c ées
