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Foliar nitrogen (N) isotope ratios (δ15N) are used as a proxy for N-cycling processes, including the “openness” of the N cycle and the use of distinct N sources, but there is little experimental support for such proxies in lowland tropical forest. To address this, we examined the δ15N values of soluble soil N and canopy foliage of four tree species after 13 years of factorial N and P addition to a...
The concentration, stoichiometry and resorption of nitrogen (N) and phosphorus (P) in plant leaves are often used as proxies of the availability of these growth‐limiting nutrients, but the responses of these metrics to changes in nutrient availability remain largely untested for tropical forest trees.We evaluated changes in N and P concentrations, N/P ratios and resorption for four common tree species...
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