Effects of Lantana camara invasion on lawn soil nutrient properties.
The effects of invasive Lantana camara on soil properties and soil enzymatic activities at different lawn habitats along the invaded process of L. camara were studied in China. The treatments comprised 4 sites denoting the invasive progress of L. camara: naked field site (CK); non-invaded site; newly invaded site; and heavily invaded site. The soil samples were collected at rhizosphere zones (about 0 -20 cm) on 5 January 2008. The rhizosphere soil pH, organic carbon, total N and K, NH4+-N, NO3--N and available K contents in heavily invaded site showed the highest value, followed by the newly invaded site and the lowest in CK. As mentioned above, the rhizosphere soil enzymatic activities among different sites were as follows: CK < non-invaded site < newly invaded site < heavily invaded site. In contrast, the soil total P and available P contents among different sites decreased in the order: CK > non-invaded site > new invaded site > heavily invaded site. There were significant positive correlations between soil enzymatic activities and soil pH, organic carbon, total N and K, NH4+-N, NO3--N and available K, but significant negative correlations between soil enzymatic activities and soil total P and available P. These results indicated that the invasive weed L. camara altered soil enzymatic activities and the trade-offs of nutrient supply and demand, which might facilitate growth, but inhibit other plant growth. This study indicated that alien invasion plant caused huge impacts on native habitats.