For a long time I've heard people talk about the effects of adding =
mineral fertilizers to grasslands - how it causes a crash in species =
richness.=20

Has anyone ever tried adding mineral fertilizer to tropical forest and =
studying (say) the species diversity of seedlings, or long term effects =
on regeneration?

It may be interesting from the point of view of understanding =
maintainance of species richness.=20

Examining effects on growth rate of tropical trees might also be =
relevant to the idea of setting up artificial forests for carbon =
sequestration.=20

     Jonathan Adams

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