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Seasonality of C, N and P cycling in a tropical Terra Firme forest soil

  • 7 May, 2024
  • 16:00
  • Wageningen University, Soil Chemistry and Chemical Soil Quality
  • prof.dr. R.N.J. Comans
  • dr.ir. M.R. Hoosbeek

Soil development, climate, and plant and microbial activity affect the availability and cycling of carbon, nitrogen, and phosphorus in tropical soils of the Amazon basin. The thesis investigates 1) how soil nutrient pools (extractable, microbial, and total) and their stoichiometry change across seasons and soil depths, reflecting shifts in resource availability and microbial community composition, 2) how soil enzyme activity, which drives the mineralization of organic matter and nutrients, is influenced by precipitation, leaf litterfall, and soil nutrient availability, and 3) the factors that control the fluctuation of soil phosphorus fractions, such as litter decomposition and soil phosphatase activity, and how they affect the phosphorus economy in phosphorus-poor soils.
I emphasize the impact of climate change on soil biogeochemistry in tropical forests. Rising CO2 levels could intensify the tight soil phosphorus cycle, affecting forest productivity and composition. Understanding these interactions can help predict tropical ecosystem responses to climate changes.

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Karst Schaap

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