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. Nitrogen (N) availability influences patterns ofterrestrial productivity and global carbon cycling, imparting strong butpoorly resolved feedbacks on Earth's climate system. Central questionsconcern the timescale of N cycle response to elevated CO2 concentrationin the atmosphere and whether availability of this limiting nutrientincreases or decreases with climate change. Nitrogen isotopic composition ofbulk plant leaves provides information on large-scale patterns of Navailability in the modern environment. Here we examine the utility ofchlorins, degradation products of chlorophyll, hypothesized to persist insoil subsequent to plant decay, as proxies for reconstructing past plantδ15N. Specifically, we test the hypothesis that δ15N of plant leaves (δ15Nleaf) is recorded inδ15N of pheophytin a (δ15Npheo) along theleaf–litter–soil continuum across an array of ecosystem climate conditionsand plant functional types (C3, C4, legumes, and woody plants). The δ15N of live foliage and bulk soil display marked declines withincreasing rainfall, consistent with past studies in Hawaii and patternsworldwide. We find measurable chlorin concentrations along soil–depthprofiles at all sites, with pheophytin a present in amounts required forisotopic analysis (&gt;10 nmol). δ15Npheo inleaves, litter, and soil track δ15Nleaf of plant leaves.We find potential for δ15Npheo records from soil toprovide proxy information on δ15Nleaf.

biogeosciences

Strong correspondence between nitrogen isotope composition of foliage and chlorin across a rainfall gradient: implications for paleo-reconstruction of the nitrogen cycle