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The organic phosphorus economy of tropical rain forests along a phosphorus-use efficiency gradient in Borneo
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DOI：10.1007/s11104-026-08964-z.png)
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Abstract
En 中文
Phosphorus (P) cycling regulates the nutrition and ecology of tropical forests, yet there is considerable uncertainty about the forms and fluxes of P in these ecosystems. In particular, the contribution of organic P remains uncertain, despite being fundamental to understanding forest ecology. Biological P pools in tropical forests turn over rapidly, so the flux of organic P through them represents the total mineralization rate of organic P assuming a constant pool size under a short-term steady state condition. We quantified organic and inorganic P fluxes through three biological compartments (fine litter, fine roots, and soil microbial biomass) in tropical forests of Borneo spanning a strong gradient of P availability and limitation. We used this data in a short-term steady state P budget model to identify an organic P economy of lowland tropical forests. Organic P accounted for 86 to 92% of the total biological P flux, with greater values in P rich sites. Most of the P flux originated from organic P turnover through the microbial biomass. The proportion of organic P in the microbial biomass explained the variation in the relative contribution of organic P to total biological P flux. Rapid microbial turnover and the large proportion of microbial P in organic forms means that organic P is the predominant form of P supply in tropical forests. Organic P dynamics and acquisition therefore drive P nutrition and mechanisms of adaptation to P deficiency in these productive and hyperdiverse ecosystems.
Keywords:
Fine roots
Litter
Microbial turnover
Phosphorus mineralization
Soil bacteria
Soil organic phosphorus
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