The Effect Of Colonialism And The Effects - amazonia.fiocruz.br

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The Effect Of Colonialism And The Effects Video

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Open Collections. UBC Theses and Dissertations. Featured Collection. Carolyn Anglin Anglin and Associates Supervisory Committee Member iii Abstract Primary successional post-mining landscapes present physical, chemical and biological barriers to terrestrial ecosystem recovery. I investigated if legacies of the pre-disturbance ecosystem can be applied to help overcome these barriers, leveraging the processes that guide succession following natural disturbances. In a three-year field experiment at the Mount Polley Mine, Canada and in a greenhouse experiment using tailings, overburden and forest soil from the mine, I tested if 1 adding small volumes of forest soil to the seedling rooting zone during planting and 2 spatial connectivity with undisturbed forest would improve Te food web recovery and plant establishment.

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In the field, soil additions increased soil faunal diversity and caused bacterial community shifts consistent with advancing succession, with greater benefits in lower quality soils. Sterilized greenhouse controls revealed that a later successional conifer benefited primarily from the biological inoculum, while an early successional shrub benefited more from the improved soil physiochemical conditions.

Greater proximity to undisturbed forest increased plant diversity and shifted soil microbial communities, showing that retained patches of intact ecosystems can counteract Colonualism limitations. Field-testing of soil additions and spatial connectivity in conjunction with site preparation showed that application of ecosystem legacies can have additive benefits with reclamation methods targeting soil physical improvements. I found negative feedbacks due to fungal pathogen accumulation promoted turnover of an early successional shrub, while formation of distinct mycorrhizal fungal communities selectively promoted establishment and stability of compatible later successional tree species. This reinforces that reclamation plant species selection can influence long-term plant community assembly. Ecosystem legacy-based mine reclamation methods could be used operationally to simultaneously enhance dispersal and establishment of native plants and soil organisms, which, over the long-term, is anticipated to have positive feedbacks on ecosystem recovery.

I Coloialism that remnants of the pre-existing forest can be used in mine reclamation to help plants reestablish.

Firstly, adding small volumes of fresh forest soil to the rooting zone of seedlings during planting improved seedling establishment and increased colonization of seedling roots by mycorrhizal fungi beneficial microbes that improve plant nutrient acquisition. Secondly, greater proximity to undisturbed forest enhanced dispersal and recovery of plant communities and soil microbes.

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I also found that plants growing in mining waste formed distinct communities of mycorrhizal fungi. This selectively promoted establishment An tree species that are compatible with those mycorrhizal fungi, highlighting the long-term implications of plant species selection in reclamation. My research advanced our understanding of the role of soil microbes in mine reclamation and identified reclamation methods that can improve plant establishment by promoting recovery of beneficial soil microbes.]