Importance of disturbance history on net primary productivity in the world's most productive forests and implications for the global carbon cycle

Global Change Biology
Liubov VolkovaPhilip J Polglase

Abstract

Analysis of growth and biomass turnover in natural forests of Eucalyptus regnans, the world's tallest angiosperm, reveals it is also the world's most productive forest type, with fire disturbance an important mediator of net primary productivity (NPP). A comprehensive empirical database was used to calculate the averaged temporal pattern of NPP from regeneration to 250 years age. NPP peaks at 23.1 ± 3.8 (95% interquantile range) Mg C ha-1  year-1 at age 14 years, and declines gradually to about 9.2 ± 0.8 Mg C ha-1  year-1 at 130 years, with an average NPP over 250 years of 11.4 ± 1.1 Mg C ha-1  year-1 , a value similar to the most productive temperate and tropical forests around the world. We then applied the age-class distribution of E. regnans resulting from relatively recent historical fires to estimate current NPP for the forest estate. Values of NPP were 40% higher (13 Mg C ha-1  year-1 ) than if forests were assumed to be at maturity (9.2 Mg C ha-1  year-1 ). The empirically derived NPP time series for the E. regnans estate was then compared against predictions from 21 global circulation models, showing that none of them had the capacity to simulate a post-disturbance peak in NPP, as found in E. regnans. The potential imp...Continue Reading

References

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Oct 19, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Yadvinder MalhiDavid Galbraith
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Dec 1, 2004·Functional Plant Biology : FPB·Stephen H RoxburghMicahel L Roderick

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Citations

Jan 29, 2021·Ecology Letters·Adam D MillerKatriona Shea
Nov 14, 2020·The Science of the Total Environment·Jessica CastagnaGiuseppe Mendicino

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