Bioregions of the nt
Kerle, J. A.
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Technical Report LRD94100 Viewed at 07:02:32 on 18/02/2010 Page 254 of 275. 6.2.6 Exotic Plants A number of exotic species are already present in the park, 15 recorded in this survey and 17 by Bowman et al (1988). Some of these are widespread across the region, such as Passiflora foetida, Hyptis suaveolens and Aervajavanica, and may be considered naturalised. To manage these species it is necessary to determine which are the problem weed species, the extent of their distribution and the mode and speed of their spread. Many exotic plants commonly referred to as weeds occur in disturbed areas. These include Hyptis and Sida in cattle 'camps' and Aerva on roadsides. These areas and the spread of weed species may be a result of feral animals or a previous eras pastoral animals, or tourists who move within and between the parks. Water is another important vector for weed spread especially along the river and streams which are seasonally flooded. It is important to control weeds for conservational and aesthetic reasons. No species marked in the species list in 5.3.1 poses a severe threat to the Park habitats, although in sufficient numbers it is possible for floristic communities to be altered, especially in the ground strata. Weeds may replace indigenous species. The unsightly presence of weeds also reduces the aesthetiC value of the Park, which is undesirable in a national park where visitation is increasing, 6.2.7 Erosion Erosion is evident in some regions of the Park, particularly along some river courses and on 'scald' areas on footslopes of the plateaux, Some areas of the Park will be intended for moderate to intensive use for tourism. Planning of infrastructure, such as roads and camping areas, on the appropriate land type and stabilisation of existing use areas, is important to avoid erosion. Sensitive areas include sandy loose soils, colluvial or alluvial soils on slopes, River banks and adjacent flats are particularly susceptible to degradation. Seasonal flooding will cause severe erosion from banks and levees where vegetation has been killed and/or removed. Uncontrolled high visitation and bank wash from motor boats are significant causes of disturbance in some areas of th e Victoria River. 5
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