Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506819
Title: Determinants of Seedling Recruitment in Mimosa Pigra L
Author: Mansor, Asyraf
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2008
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Abstract:
Mimosa pigra L., a semi-aquatic woody legume, is a well known invasive plant in the tropics. Originating from Latin America, this species has spread to various localities around the globe and caused serious problems, both environmental and economical, in its new environment. I carried out a survey to assess the current status of Mimosa infestation in Peninsula Malaysia. Manipulative field experiments on the effect of soil disturbance, competitor identities, sown seed densities and defoliation on Mimosa seedling recruitment and survival were conducted as well. I found that although disturbance may not be an essential factor for seedling emergence in Mimosa, it significantly increase seedling establishment and survival. Recruitment in Mimosa was negatively affected when seedlings were grown together with vine (Centrosema) and creeper (Ipomoea), suggesting the importance of interspecific competition in reducing seedling emergence and establishment. The seed-sowing treatment showed that recruitment in Mimosa was both seed-limited and microsite-limited. While the number of seedlings emerging increased with the density of sown seeds, the proportion of emergence remained constant across the sown seed densities. Herbivory (through artificial defoliation) reduced seedling survival in Mimosa, although some seedlings proved to be resilient to even the highest intensity and frequency of defoliation. In general, I argued that Mimosa invasion in Peninsula Malaysia is not a serious problem since its populations were mostly restricted to disturbed ground and abandoned land. I would like to suggest that current best course of option is to continue monitoring its population and evaluate its spread, as control of established stands without destruction of the seed bank is likely to cause insignificant impact on subsequent population. One recommendation is to restrict the movement of topsoil from Mimosa infested sites. Future researches, if they were to be conducted shoUld try to establish method(s) that will reduce the Mimosa seed bank.
Supervisor: Not available Sponsor: Not available
Qualification Name: Not available Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.506819  DOI: Not available
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