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Light inhibition of leaf respiration as soil fertility declines along a post-glacial chronosequence in New Zealand: an analysis using the Kok method |
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| Authors: | Owen K. Atkin Matthew H. Turnbull Joana Zaragoza-Castells Nikolaos M. Fyllas Jon Lloyd Patrick Meir Kevin L. Griffin |
| Affiliation: | 1. Division of Plant Sciences, Research School of Biology, Building 46, The Australian National University, Canberra, ACT, 0200, Australia 2. School of Biological Sciences, University of Canterbury, Christchurch, 8140, New Zealand 3. School of Geosciences, University of Edinburgh, Drummond St, EH8 9XP, Edinburgh, UK 4. School of Geography, Earth and Biosphere Institute, University of Leeds, Leeds, LS2 9JT, UK 5. Department of Ecology & Systematics, Faculty of Biology, University of Athens, Athens, Greece 6. School of Earth and Environmental Science, James Cook University, Cairns, 4870, Australia 7. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA |
| Abstract: | Background and aimsOur study quantified variations leaf respiration in darkness (R D) and light (R L), and associated traits along the Franz Josef Glacier soil development chronosequence in New Zealand.MethodsAt six sites along the chronosequence (soil age: 6, 60, 150, 500, 12,000 and 120,000 years old), we measured rates of leaf R D, R L (using Kok method), light-saturated CO2 assimilation rates (A), leaf mass per unit area (M A), and concentrations of leaf nitrogen ([N]), phosphorus ([P]), soluble sugars and starch.ResultsThe chronosequence was characterised by decreasing R D, R L and A, reduced [N] and [P] and increasing M A as soil age increased. Light inhibition of R occurred across the chronosequence (mean inhibition = 16 %), resulting in ratios of R L:A being lower than for R D:A. Importantly, the degree of light inhibition differed across the chronosequence, being lowest at young sites and highest at old sites. This resulted in R L:A ratios being relatively constant across the chronosequence, whereas R D:A ratios increased with increasing soil age. Log-log R-A-M A-[N] relationships remained constant along the chronosequence. By contrast, relationships linking rates of leaf R to [P] differed among leaves with low vs high [N]:[P] ratios. Slopes of log-log bivariate relationships linking R L to A, M A, [N] and [P] were steeper than that for R D.ConclusionsOur findings have important implications for predictive models that seek to account for light inhibition of R, and for our understanding of how environmental gradients impact on leaf trait relationships |
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