<Emphasis Type="Italic">Lantana camara</Emphasis> L. (Verbenaceae) invasion effects on soil physicochemical properties |
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Authors: | Olusegun O Osunkoya Christine Perrett |
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Institution: | (1) Department of Employment, Economic Development and Innovation, Alan Fletcher Research Station, Biosecurity Science, Queensland Primary Industries and Fisheries, PO Box 36, Sherwood, QLD, 4075, Australia |
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Abstract: | Lantana camara is a recognized weed of worldwide significance due to its extensive distribution and its impacts on primary industries and
nature conservation. However, quantitative data on the impact of the weed on soil ecosystem properties are scanty, especially
in SE Australia, despite the pervasive presence of the weed along its coastal and inland regions. Consequently, mineral soils
for physicochemical analyses were collected beneath and away from L. camara infestations in four sites west of Brisbane, SE Australia. These sites (hoop pine plantation, cattle farm, and two eucalyptus
forests with occasional grazing and a fire regime, respectively) vary in landscape and land-use types. Significant site effect
was more frequently observed than effect due to invasion status. Nonetheless, after controlling for site differences, ~50%
of the 23 soil traits examined differed significantly between infested and non-infested soils. Moisture, pH, Ca, total and
organic C, and total N (but not exchangeable N in form of NO3-) were significantly elevated, while sodium, chloride, copper, iron, sulfur, and manganese, many of which can be toxic to
plant growth if present in excess levels, were present at lower levels in soils supporting L. camara compared to soils lacking the weed. These results indicate that L. camara can improve soil fertility and influence nutrient cycling, making the substratum ideal for its own growth and might explain
the ability of the weed to outcompete other species, especially native ones. |
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