The land resources of Cobourg Peninsula
by B. Wood and D. Sivertsen
Wood, B.; Sivertsen, D.; Conservation Commission of the Northern Territory
E-Publications; E-Books; PublicationNT
Made available via the Publications (Legal Deposit) Act 2004 (NT).; This report describes a land system survey over the Cobourg Peninsula broadly describing landform, soils and vegetation to assist the effective planning and management of the area as a National Park.
1. Introduction -- 2. Summary Descriptions -- 3. Land Systems -- 4. Soils -- 5. Vegetation -- Appendices -- Acknowledgements.
Land use -- Northern Territory -- Cobourg Peninsula; Vegetation mapping -- Northern Territory -- Cobourg Peninsula
Conservation Commission of the Northern Territory
iv, 80,  p. : col. ills. ; 30 cm.
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4.5 Soil Erosion Soil erosion is not at present a serious problem on Cobourg Peninsula. This is not indica,tive of a lack of erosion hazard how eve~, as the sOils .of thearea, like: those of other areas of the Top End, are potentially highly erodible. The high potential erodibility of ~he soils is more obvious once the protective vegetation and gravel layer are removed during devel opment or some form of intensive land use. Will iams (1976) estimates that if bar,e soil was exposed during the wet season as a result of development, .a~ increase in the rate of erosion of the order of 20 10_0 is likely. This e~timate has been cpnfirmed by the work of Duggan (1984) in the Alligator Rivers Region. A fecent reyiew of erosion in Kakadu National Park (Applegate et. al , . .oil"! t' f:!:I3-.) has indicated that the p~or siting of roads and (~) -tracks, and the lack of adequ,ate road drainage was on~ of the major causes of erosion ir the area. Whilst this is not a major problem at Cobourg at present,. erosion associated with the siting and use of roads and tracks may ~n~rease in the future correspond in9 to an in crease , in visitqr usage. Areas of c~ncern ., occur mainly in Mount norris, Wangarlu, Alaru and Dune land system~_. , On soils which are poorly drained (e.g. Copeland, Croker and . ~. ~ BU!'ton soil?) c_ontrolled access, especially durin9 the wet and early dry seasons, may be necessary to avoid channeling, cutting and later-. , . al track expansion in wet areas. Maintenance of . roads J traversing these land systems would be expected to be relatively high. The sand.s of the beach ridges (Dune sands) are usually stabil~ . .. . ~ - .. ized by a protective covering of vegetation and plant debris. Again, access through these areas should be controlled to avoid a prol ifer ation of tracks which will tend to destroy the vegetation and destab-. , ilize the ridges. _ Erosion and degradation of areas associat~d with buffalo wa? only observed in the fringes of the major drainage channels (Unit 2, " . (.. ~ (. Alaru l~nd system) and, whilst only localised, ?~ould be monitored regularly so remedial action can be initiated early. Since the extent of accel erated erosion will be infl uenced by . the amount of bare soil exposed to ~he wet season storms, it is imper ative that the destruction of vege,tation and disturbance of the soil surface is kept to a minimum during the development of any intensive - 28
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