Production and carbon allocation in monocultures and mixed-species plantations of Eucalyptus grandis and Acacia mangium in Brazil

Tree Physiology
Yann NouvellonJean-Pierre Bouillet

Abstract

Introducing nitrogen-fixing tree species in fast-growing eucalypt plantations has the potential to improve soil nitrogen availability compared with eucalypt monocultures. Whether or not the changes in soil nutrient status and stand structure will lead to mixtures that out-yield monocultures depends on the balance between positive interactions and the negative effects of interspecific competition, and on their effect on carbon (C) uptake and partitioning. We used a C budget approach to quantify growth, C uptake and C partitioning in monocultures of Eucalyptus grandis (W. Hill ex Maiden) and Acacia mangium (Willd.) (treatments E100 and A100, respectively), and in a mixture at the same stocking density with the two species at a proportion of 1 : 1 (treatment MS). Allometric relationships established over the whole rotation, and measurements of soil CO(2) efflux and aboveground litterfall for ages 4-6 years after planting were used to estimate aboveground net primary production (ANPP), total belowground carbon flux (TBCF) and gross primary production (GPP). We tested the hypotheses that (i) species differences for wood production between E. grandis and A. mangium monocultures were partly explained by different C partitioning strate...Continue Reading

References

Jul 7, 2005·The New Phytologist·M G TjoelkerD Tilman
Aug 16, 2006·Journal of Experimental Botany·Shawn X MengMing Jin
Dec 13, 2006·Proceedings of the National Academy of Sciences of the United States of America·Sari PalmrothWilliam H Schlesinger
Dec 8, 2007·Science·Hans de Kroon
May 18, 2010·Tree Physiology·Anna E RichardsMichael Scherer-Lorenzen

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