WETLAND DELINEATION REPORT - SRK Consulting

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Wetland and Vegetation AssessmentProminent grass species include Aristida junciformis and Melinis repens. Prominent forbs recordedinclude Chamaecrista comosa, Eriosema kraussianum, Helichrysum cephaloideum,Pseudognaphalium luteo-album, Senecio madagascariensis, Vernonia oligocephala andWahlenbergia krebsii. Table 4 listed the plant species that were identified in this plant communityduring the time of the survey.Table 4: Plant species identified in Helichrysum krausii–Chrysanthemoides monilifera Shrublandduring the time of the surveyTREESFORBSChromolaena odorata (L.) R.M.King & H.Rob. Amaranthus hybridus L.Chrysanthemoides monilifera (L.) Norl.Chamaecrista comosa E.Mey.Crotalaria monteiroi Taub. ex Baker f. Commelina erecta L.Helichrysum kraussii Sch.Bip.Eriosema kraussianum Meisn.Lantana camara L.Helichrysum cephaloideum DC.Melia azedarach L.Hewittia malabarica (L.) SureshPhyllanthus reticulatus Poir. Momordica balsamina L.Pseudognaphalium luteo-album (L.)Pluchea dioscoridis (L.) DC.Hilliard & B.L.BurttSolanum mauritianum Scop. Ricinus communis L.Senecio madagascariensis Poir.Vernonia oligocephala (DC.) Sch.Bip. exWalp.Wahlenbergia krebsii Cham.Zehneria scabra (L.f.) Sond.GRASSESREEDS AND SEDGESAristida diffusa Trin.Phragmites australis (Cav.) Steud.Aristida junciformis Trin. & Rupr.Cynodon dactylon (L.) Pers.Dactyloctenium aegyptium (L.) Willd.Eleusine coracana (L.) Gaertn.Melinis repens (Willd.) ZizkaPanicum maximum Jacq.INSTITUTE OF NATURAL RESOURCES 21
Wetland and Vegetation AssessmentFigure 16: Highly leached nutrient poor soils of the Helichrysum krausii–Chrysanthemoidesmonilifera shrubland communityFigure 17: Helichrysum krausii–Chrysanthemoides monilifera shrubland communityPlant Community 3: Lantana camara–Chromolaena odorata ThicketsThe Lantana camara–Chromolaena odorata thickets occur mainly south of the fragmentedwatercourse transversing the study area (Figure 13). Recent attempts to remove invasive alien plantspecies have led to sever disturbances to the vegetation. Due to the complete dominance of invasivealien plants within this community, removal of such species leaves the system with very littleremaining vegetation. In places where clearing operations have not yet been undertaken, invasivealien species form impenetrable thickets, smothering nearly all indigenous vegetation (Figure 18).Soils of this plant community are generally without structure and texture can be described as sandy.These sandy soils are deep, highly leached and nutrient poor (>1.2 m) and show no clear horizonformation. Along the eastern sections of this community, the topsoil appeared to have beenenriched with filter cake-ash (Figure 19).According to Edwards (1983) structural classification, the vegetation structure can be described as“Low thicket”. Shrubs height ranges from 1 to 3 m, while mean tree height is approximately 8 m. Theshrub layer forms impenetrable thickets. Recent attempts to clear invasive alien species have led todramatic changes in vegetation structure in some areas, leaving almost no live vegetation cover. InINSTITUTE OF NATURAL RESOURCES 22
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