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Universiteit van Amsterdam (2016)

The ups and downs of aggregate stability after agricultural land abandonment in a semi- arid environment

Evans J.A.

Titre : The ups and downs of aggregate stability after agricultural land abandonment in a semi- arid environment

Auteur : Evans J.A.

Université de soutenance : Universiteit van Amsterdam Institute for Biodiversity and Ecosystem Dynamics (IBED)

Grade : Master programme : Environmental Management 2016

Descriptif
During secondary succession of abandoned agricultural land in semi- arid environments aggregate stability significantly increases. Recent research has shown that during this rise in stability there is a period of decrease that is as yet unexplained. I hypothesised that this dip in aggregate stability was due to changing litter inputs as a result of changes to aboveground vegetation inherent to secondary succession. I studied a chronosequence of samples from Mediterranean Spain for changing quantities of the aggregate stabilising protein glomalin and performed density fractionation and thermally assisted hydrolysis and methylation procedures to examine the changing composition of aggregate stabilising SOM. I found that at the same time as the dip in aggregate stability, glomalin and the labile fraction of SOM decreases.

Présentation

Page publiée le 7 novembre 2016, mise à jour le 13 octobre 2018