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• W748770578 abstract "Invasive plants often have different physiological properties, chemical components and nutrient element dynamics from native vegetation, which can contribute to their invasiveness and change soil properties. Lippia (Phyla canescens (Kunth) Greene; family: Verbenaceae) is a perennial herb of South American origin. In Australia, lippia replaces desired species in native and improved pastures and is causing serious environmental and pastoral problems in the Murray-Darling Basin. However, the effect of lippia invasion on the water, carbon and nutrient dynamics of pasture soil is not known. In this study, we compared the carbon and nitrogen stable isotope ratio, soil moisture, organic carbon, and nutrient elements in the plant-soil system on lippia infested land and adjacent native and improved pasture. Comparisons were made at three sites, at Somerset Dam (SE QLD), near Leyburn (Eastern Darling Downs, QLD) and near Maitland (the Hunter Valley, NSW). We tested two hypotheses: (1) that lippia displays different stable isotope signature and nutrient element components to the major pasture grasses; and (2) that soil infested by lippia will be substantially different from soil under native pasture in soil moisture, stable isotope signature and nutrient dynamics. Consistent differences between lippia and grass pastures were detected across all three sites, despite large differences between sites in soil, vegetation, and climate conditions. The plant tissue of lippia had a much higher calcium concentration (up to 4% w/w) than pasture grass species regardless of the concentration of soil exchangeable Ca. This observation, together with chemical analysis which shows more than 65% of calcium in leaf tissue is not soluble to 80% acetic acid, suggests the existence of calcium oxalate, although crystals were not observable under a light microscope. If present, these crystals are likely to inhibit feeding by cattle and other potential herbivores, thereby benefiting lippia in heavily grazed pasture. In addition, calcium carbonate crystals were found in the lithocyst on the leaf surface, which may also contribute to herbivore defence. Do tissue chemical components and the effect of vegetation on soil properties contribute to the invasiveness of lippia (Phyla canescens)? – indications from soil moisture and plant calcium concentration" @default.
• W748770578 created "2016-06-24" @default.
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• W748770578 date "2008-01-01" @default.
• W748770578 modified "2023-10-07" @default.
• W748770578 title "Do tissue chemical components and the effect of vegetation on soil properties contribute to the invasiveness of lippia (Phyla canescens)? - Indications from soil moisture and plant calcium concentration." @default.
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