WETLAND DELINEATION REPORT - SRK Consulting

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Wetland and Vegetation Assessmentareas where these thickets are still in tack, practically all other vegetation is smothered, resulting ina non-existent herbaceous layer.Dominant and prominent woody species include Chromolaena odorata, Lantana camara, Meliaazedarach, Pluchea dioscoridis, Ricinus communis and Solanum mauritianum. Grass species arerestricted to the periphery of thickets and include Chloris pycnothrix, Cynodon dactylon,Dactyloctenium aegyptium, Eleusine coracana, Imperata cylindrica and Panicum maximum. The mostof the prominent herbaceous species recorded was the weedy exotic species Amaranthus hybridus.Table 5 listed the plant species that were identified in this plant community during the time of thesurvey.Table 5: Plant species identified in Lantana camara–Chromolaena odorata Thickets during the timeof the surveyTREESGRASSESChromolaena odorata (L.) R.M.King & H.Rob.Chloris pycnothrix Trin.Chrysanthemoides monilifera (L.) Norl.Cynodon dactylon (L.) Pers.Lantana camara L.Dactyloctenium aegyptium (L.) Willd.Melia azedarach L.Eleusine coracana (L.) Gaertn.Phyllanthus reticulatus Poir.Imperata cylindrica (L.) Raeusch.Pluchea dioscoridis (L.) DC.Panicum maximum Jacq.Ricinus communis L.Solanum mauritianum Scop.FORBSAmaranthus hybridus L.Solanum kwebense N.E.Br.Hewittia malabarica (L.) SureshFigure 18: Lantana camara–Chromolaena odorata thicketsINSTITUTE OF NATURAL RESOURCES 23
Wetland and Vegetation AssessmentFigure 19: Massive organic rich A-horizon along the south-eastern border of the study areaPlant Community 4: Arundo donax–Pluchea dioscoridis Reed ThicketsThe Arundo donax–Pluchea dioscoridis reed thickets occur mainly in the south-western corner of thestudy area (Figure 13). The soils of this area were relatively wet at the time of the field surveys,despite the fact that surveys were conducted during the winter amidst the seasonal dry season. Thewater logged condition of this section of the study site may possibly be a result of the roads alongthe western and southern boundaries restricting free drainage of water towards the wetlandshistorically situated south-east of the study area.Soils of this plant community are very similar to the soils along the eastern sections of the Lantanacamara–Chromolaena odorata thickets community.According to Edwards (1983) structural classification, the vegetation structure can be described as“Low thicket” (Figure 20). Shrubs height ranges from 1 to 3 m, while mean tree height isapproximately 8 m. The shrub layer forms impenetrable thickets. In addition, the exotic reed Arundodonax, contributes significantly to the structure of this plant community.Dominant and prominent woody species include Chromolaena odorata, Lantana camara, Meliaazedarach, Phyllanthus reticulates, Pluchea dioscoridis, Ricinus communis and Solanum mauritianum.Prominent grass species include Cynodon dactylon, Dactyloctenium aegyptium, Eleusine coracanaand Panicum maximum. Some of the dominant herbaceous species recorded are Amaranthushybridus, Hewittia malabarica, Vernonia oligocephala, Wahlenbergia krebsii and Zehneria scabra.Two reed species form a prominent component of the community, namely Phragmites australis andArundo donax. Table 6 listed the plant species that were identified in this plant community duringthe time of the survey.INSTITUTE OF NATURAL RESOURCES 24
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