Relationships among net primary productivity, nutrients and climate in tropical rain forest: a pan-tropical analysis |
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Authors: | Cleveland Cory C Townsend Alan R Taylor Philip Alvarez-Clare Silvia Bustamante Mercedes M C Chuyong George Dobrowski Solomon Z Grierson Pauline Harms Kyle E Houlton Benjamin Z Marklein Alison Parton William Porder Stephen Reed Sasha C Sierra Carlos A Silver Whendee L Tanner Edmund V J Wieder William R |
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Affiliation: | Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, MT 59812, USA. cory.cleveland@umontana.edu |
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Abstract: | Tropical rain forests play a dominant role in global biosphere-atmosphere CO(2) exchange. Although climate and nutrient availability regulate net primary production (NPP) and decomposition in all terrestrial ecosystems, the nature and extent of such controls in tropical forests remain poorly resolved. We conducted a meta-analysis of carbon-nutrient-climate relationships in 113 sites across the tropical forest biome. Our analyses showed that mean annual temperature was the strongest predictor of aboveground NPP (ANPP) across all tropical forests, but this relationship was driven by distinct temperature differences between upland and lowland forests. Within lowland forests (1000?m), a regression tree analysis revealed that foliar and soil-based measurements of phosphorus (P) were the only variables that explained a significant proportion of the variation in ANPP, although the relationships were weak. However, foliar P, foliar nitrogen (N), litter decomposition rate (k), soil N and soil respiration were all directly related with total surface (0-10?cm) soil P concentrations. Our analysis provides some evidence that P availability regulates NPP and other ecosystem processes in lowland tropical forests, but more importantly, underscores the need for a series of large-scale nutrient manipulations - especially in lowland forests - to elucidate the most important nutrient interactions and controls. |
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Keywords: | Carbon cycle climate decomposition meta‐analysis nitrogen nutrient limitation phosphorus primary production tropical forest |
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