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dc.contributor.advisorHill, Timothy Charles
dc.contributor.advisorTeh, Yit Arn
dc.contributor.advisorOliveras, Immaculada
dc.contributor.authorOliver, Viktoria
dc.description.abstractSoil carbon storage in tropical ecosystems is important in the global carbon cycle, yet consensus is lacking on how soil organic carbon stocks are altered under anthropogenic land-use change. This thesis seeks to quantify soil carbon stocks, the associated soil carbon emissions and explores the drivers of soil respiration in managed tropical Andean lands over a 2600 m elevation gradient. It investigates: grazing and burning on high altitude montane grasslands, burning in montane forests and agriculture in premontane forests. Changes among land-uses were quantified using belowground carbon stocks, the carbon distribution among density fractions, soil carbon emissions and environmental drivers of soil respiration. Soil respiration was a good proxy of soil carbon loss in premontane pastures and montane grassland soils. The total carbon stocks on some land-uses appeared to be unaffected but the distribution of carbon within the soil had changed and even when there were no net changes in soil carbon emissions, the drivers of respiration were different. The synergistic effect of burning and grazing in montane grasslands was the most detrimental to soil carbon stocks, whereas montane forests were unaffected. In the premontane elevation, soil carbon loss was dependent on the type of agricultural practice but the succession of secondary forest allowed soil carbon to recover to similar levels measured in the mature forest. These findings highlight the fact that although land-use does not always appear to have an obvious effect on total soil carbon stocks, the loss of carbon from short-term labile pools can cause higher carbon emissions and dominate soil-atmospheric feedbacks. Furthermore, the drivers of soil respiration and the synergistic relationship between soil moisture and temperature alter under different land uses. These factors should be taken into consideration with regards to predictions of regional temperature/precipitation climate change and soil carbon management policy in order to arrive at more realistic decisions.en_US
dc.publisherUniversity of St Andrews
dc.subjectSoil carbonen_US
dc.subjectSoil respirationen_US
dc.subject.lcshSoils--Carbon content--Peruen_US
dc.subject.lcshLand use, Rural--Peruen_US
dc.subject.lcshLand use, Rural--Andesen_US
dc.subject.lcshSoil respiration--Peruen_US
dc.titleThe effect of land-use on soil organic carbon dynamics in the Peruvian Andesen_US
dc.contributor.sponsorACCA - Asociación para la Conservación de la Cuenca Amazónicaen_US
dc.contributor.sponsorNatural Environment Research Council (NERC)en_US
dc.type.qualificationnamePhD Doctor of Philosophyen_US
dc.publisher.institutionThe University of St Andrewsen_US
dc.publisher.departmentUniversity of Oxford, University of Aberdeenen_US
dc.rights.embargoreasonThesis restricted in accordance with University regulations. Print and electronic copy restricted until 7th April 2019

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