February 1, 1984Ecology
Litterfall, Nutrient Cycling, and Nutrient Limitation in Tropical Forests
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Discussion
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Implication
Comparative synthesis demonstrates widespread phosphorus limitation in tropical forests, suggesting that weathered soils severely restrict organic productivity.
Key Points
- To assess patterns of nitrogen, phosphorus, and calcium cycling through litterfall and identify primary nutrient limitations across tropical forest ecosystems.
- Synthesized and analyzed published nutrient and litterfall datasets across 62 tropical forest sites.
- Modeled fine litterfall against climatic variables and correlated regression residuals with litterfall nitrogen and phosphorus concentrations.
- Lowland tropical forests demonstrated high nitrogen return, but many lowland and montane forests showed low phosphorus return and elevated dry mass-to-phosphorus ratios compared to temperate forests.
- Fine litterfall mass and climate-adjusted regression residuals correlated positively with phosphorus concentrations, whereas nitrogen showed no significant correlation.
- Phosphorus availability limited litterfall across a substantial subset of intact tropical forests, particularly on old oxisols and ultisols in Amazonia.
Cite This Study
Peter M. Vitousek (1984) studied this question.