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• W48573013 abstract "This project investigated the effect of waterlogging on the productivity ofEucalyptus globulus under field conditions, and the relative tolerance of the twotemperate plantation eucalypt species, E. glob ulus and E. nitens, from thesubgenus Symphyomyrtus, to waterlogging.In eucalypt plantations across Tasmania, waterlogging is a serious threat toproductivity. It is estimated that at least 11 % of all commercial eucalyptplantations in Tasmania are affected to some degree, by waterlogging. The lossesincurred by waterlogging during the first 2 years of plantation establishment werefound to have significant long-term effects on tree productivity at two sites acrossthe state.In the field, soil indicators of long-term waterlogging, specifically the evidence ofgreying, in combination with current seasonal waterlogging and development ofhypoxic soil conditions were found to be the factors closely associated with severereductions in tree height and growth. The use of extensive soil mapping andassessment prior to plantation establishment are therefore effective tools inidentifying potential waterlogging problems.Under long-term waterlogging, there was no indication of the development ofplant water stress during exposure to waterlogging. Waterlogged seedlings ofboth species exhibited reduced foliar nutrient status, with significantly reducedfoliar nitrogen, phosphorus and potassium concentrations. Therefore,waterlogging-induced nutrient deficiency is a mechanism involved in the growthreduction of these species under waterlogged conditions.Various methods of fertiliser application were investigated to determine the mosteffective mode in ameliorating waterlogging damage. Soil-based applications ofslow release fertilisers applied either prior to, or after, a waterlogging event, werethe most successful. Fertiliser application was associated with improved growth,foliar nutrition and increased aerenchymatous root production. Reduced availability of nutrients in waterlogged soils and/or reduced uptake ofthese nutrients are the two possible mechanisms leading to the development offoliar nutrient deficiency of waterlogged plants. It was found that under hypoxichydroponic culture, seedlings with low nutrient status were capable of anincreased uptake of nutrients when transferred to high nutrient conditions. Thisresult is significant as it identifies reduced availability of soil nutrients as theprimary mechanism responsible for the development of foliar nutrient deficiencyin E. globulus and E. nitens under waterlogged conditions.The relationship between aerenchymatous root development and waterloggingtolerance was investigated. It was determined that singular measurements of rootadaptive capacity should not be used as the sole measure of tolerance towaterlogging in these species. The regulation of growth and maintenance ofrelatively high photosynthetic rates are also useful indicators of tolerance. Usingthis array of measures, it was determined that E. nitens was inherently morewaterlogging tolerant than E. globulus. Eucalyptus globulus seedlingsdemonstrated a greater potential for increased waterlogging tolerance by theapplication of fertiliser regimes." @default.
• W48573013 created "2016-06-24" @default.
• W48573013 creator A5038943943 @default.
• W48573013 date "2006-01-01" @default.
• W48573013 modified "2023-09-27" @default.
• W48573013 title "Waterlogging in the temperate plantation species Eucalyptus globulus and E. nitens" @default.
• W48573013 hasPublicationYear "2006" @default.
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