摘要：Attempts to obtain standardised decomposition data to determine potential drivers of carbon release have evolved from the use of cotton strips and standardised leaf litter mixtures to the most recent Tea Bag Index (TBI).The TBI is an internationally standardised method to collect comparable, globally distributed data on decomposition rate and litter stabilisation, using commercially available tea bags as standardised test kits.As this index was developed as a citizen science project in the northern hemisphere, we aimed to highlight the potential value – and pitfalls – of its application in a subtropical African savanna.We furthermore aimed to expand on existing protocol details and propose amendments to achieve an enhanced understanding of decomposition dynamics across temporal and spatial scales in African ecosystems.Proposed adaptations include extended incubation periods for long-term monitoring studies, the burial of more tea bags to account for potential losses, and the use of additional equipment to enhance effective sampling.These adaptations provide a system-specific protocol which can facilitate studies aimed to understand the interactions between top-down drivers (e.g.herbivory, fire, climate variability) and bottom-up controls (e.g.decomposition) in carbon flux dynamics of savanna ecosystems.Application of the proposed extended protocol in a semi-arid savanna provided results which reinforce the potential value of the TBI in an African context.
