Temperature - European Investment Bank

WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD.
Mount Coffee HPP ESIA and RAP 2012-09-18
ESIA Report Page 57
schweinfurthii, Lophira alata, Petersianthus macrocarpus, santiria trimera,
Tabernaemontana crassa and Uapaca guineensis. The undergrowth is dominated
by Haumania danckelmaniana, palisota ambigua and Heisteria parviflora.
� Mixed evergreen and semi-deciduous forest with the predominance of the
elements of semi-deciduous forest. This forest type which occurs in upstream
area is similar to the forest described above, but it contains many more semideciduous
elements than the former. The forest is characterised by a
discontinuous canopy regularly with scattered plant species which include
Anisophyllea polyneura, Pycnanthus angolensis, Pentaclethra macrophylla,
Santiria trimera, Lophira alata. The undergrowth is dominated by Haumaniana
danckelmaniana and rattan species such as Calamus deeratus, Laccosperma spp.
� The vegetal formation mostly monospecific of Pterocarpus santalinoides. Well
developed sometimes on rocky soil and scattered along the river borders from
downstream to upstream. Sometime this plant is accompanied by Nauclea
pobeguini, Uapaca heudelotii and Myrianthus arboreus.
In some areas degradation is very severe, only few trees are still standing in secondary
vegetation consisting of woody pioneer species like Alchornea cordifolia, Harungana
madagascariensis and herbaceous species including Chromolaena odorata, Nephrolepis
biserrata and Buforestia mannii.
9.1.1.1 Overview of the Flora in the Dam’s Zone of Influence
Floristic diversity of the dam’s zone of influence was assessed by sampling bases on the
establishment of parcels 0.1 ha (100 m x 10 m). A total of 10 parcels were established
(2 in downstream, 5 five in the reservoir and 3 upstream), covering a total surface of 1.0
ha. In addition plant species were identified here and there outside the parcels. Many
types of plant habitus are nowadays found in the dam’s zone of influence:
� The old secondary humid rain forests, characterized by high canopy and the
understorey rich in shrubs such as Rauvolfia vomitoria, Ficus spp, Bridelia
micrantha.
� Young secondary forests, characterized by short opened canopy and the
presence of Anthocleista vogelii, Anisophyllea meniaudi, Bridelia grandis,
Harungana madagascariensis, Barteria nigritiana. The undergrowth is rich in
Tetracera alnifolia.
� Along certain tributaries of the main river there are swamping forests established in
valleys, rich in Spondianthus preussii, Nauclea pobegueni and Duguettia mannii.
� Periodically flooded forests developing where water was flooded during the
functioning of the dam and where water is flooded now during the raining
season. Here the canopy is dominated by the abundance of Pterocarpus
santalinoides. The undergrowth is completely absent.
� At some spots of the reservoir there are herbaceous meadow on rocky soils
characterized by Graminaceae like Acroceras sp, Aoranthe cladantha and
Centothecea lappocea.
There are significant physical differences between downstream, reservoir and upstream
forests.