WHAT THE EVIDENCE SAYS
Experiments compared litter from Sonneratia apetala, Kandelia obovata and Avicennia marina alone and in mixtures. Relative to weighted expectations, only 20% of comparisons showed significant nonadditive effects on mass remaining, versus 65% for organic carbon, 70% for nitrogen and 55% for phosphorus. A three-species mixture did not consistently lose more mass than two-species combinations. Nitrogen-enrichment plots showed no monotonic dose response in mass loss.
WHY IT MATTERS / OUR READ
Carbon and nutrient processes can shift without a visually obvious increase in how quickly leaves disappear. This is a reminder to monitor the particular carbon/nutrient outcome before claiming a diverse planting has accelerated decomposition or blue-carbon storage.
CAVEATS / UNCERTAINTY
Nitrogen doses were each represented by one plot and analyzed descriptively; they cannot support replicated inference about fertilizer treatments. Litter bag decomposition and element concentrations do not equal whole-ecosystem carbon burial.
SOURCE
Zheng et al. · Frontiers in Marine Science · mangrove litter field experiments (15 Oct 2026)
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