Abstract
In the long-term absence of rejuvenating disturbances, forest succession frequently proceeds from a maximal biomass phase to a retrogressive phase characterized by reduced nutrient availability [notably nitrogen (N) and phosphorus (P)] and net primary productivity. Few studies have considered how retrogression induces changes in ecophysiological responses associated with photosynthetic carbon (C) gain, and only for trees. We tested the hypothesis that retrogression would negatively impact photosynthetic C gain of four contrasting species, and that this impact would be greater for vascular plants (i.e., trees and shrubs) than for non-vascular plants (i.e., mosses). We used a 5,000-year-old chronosequence of forested islands in Sweden, where retrogression occurs in the long-term absence of lightning-ignited wildfires. Despite fundamental differences in plant form and ecological niche among species, vascular plants and mosses showed similar ecophysiological responses to retrogression. The most common effects of retrogression were reductions in photosynthesis and respiration per unit foliar N, increases in foliar N, δ13C and δ15N, and decreases in specific leaf areas. In contrast, photosynthesis per unit mass or area generally did not change along the chronosequence, but did vary many-fold between vascular plants and mosses. The consistent increases in foliar N without corresponding increases in mass- or area-based photosynthesis suggest that other factor(s), such as P co-limitation, light conditions or water availability, may co-regulate C gain in retrogressive boreal forests. Against our predictions, traits of mosses associated with C and N were generally highly responsive to retrogression, which has implications for how mosses influence ecosystem processes in boreal forests.
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Acknowledgments
We thank Dr. Waite for help in the design and Unimeg at Umeå University for construction of the customized gas exchange chamber to measure moss photosynthesis, Elin Norlin for help in acquiring the portable gas exchange system and performing isotope analyses, Tim Steinkraus for assistance in the field, and four anonymous reviewers for helpful comments on the manuscript. This work was funded by a Swedish Research Council (Vetenskapsrådet) grant and a Wallenberg Scholars award to D.A.W., and a SLU grant awarded to M.C.N.
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Communicated by Frederick Meinzer.
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Bansal, S., Nilsson, MC. & Wardle, D.A. Response of photosynthetic carbon gain to ecosystem retrogression of vascular plants and mosses in the boreal forest. Oecologia 169, 661–672 (2012). https://doi.org/10.1007/s00442-011-2246-z
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DOI: https://doi.org/10.1007/s00442-011-2246-z