Increased belowground biomass and soil CO2 fluxes after a decade of carbon dioxide enrichment in a warm-temperate forest

Ecology
Robert B JacksonSheila M Palmer

Abstract

Atmospheric CO2 concentrations have risen 40% since the start of the industrial revolution. Beginning in 1996, the Duke Free-Air CO2 Enrichment experiment has exposed plots in a loblolly pine forest to an additional 200 microL/L CO2 compared to trees growing in ambient CO2. This paper presents new belowground data and a synthesis of results through 2008, including root biomass and nutrient concentrations, soil respiration rates, soil pore-space CO2 concentrations, and soil-solution chemistry to 2 m depth. On average in elevated CO2, fine-root biomass in the top 15 cm of soil increased by 24%, or 59 g/m2 (26 g/m2 C). Coarse-root biomass sampled in 2008 was twice as great in elevated CO2 and suggests a storage of approximately 20 g C x m(-2) x yr(-1). Root C and N concentrations were unchanged, suggesting greater belowground plant demand for N in high CO2. Soil respiration was significantly higher by 23% on average as assessed by instantaneous infrared gas analysis and 24-h integrated estimates. N fertilization decreased soil respiration and fine-root biomass by approximately 10-20% in both ambient and elevated CO2. In recent years, increases in root biomass and soil respiration grew stronger, averaging approximately 30% at high ...Continue Reading

References

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Citations

Jan 12, 2013·Oecologia·Sebastian Leuzinger, Stephan Hättenschwiler
Oct 16, 2010·Nature Reviews. Microbiology·Brajesh K SinghDave S Reay
Aug 13, 2011·Ecological Applications : a Publication of the Ecological Society of America·Ensheng Weng, Yiqi Luo
Jan 3, 2013·The Science of the Total Environment·Xinzhang SongHailong Wang
Dec 3, 2013·Global Change Biology·Na QiaoYakov Kuzyakov
Jul 27, 2012·Ecology and Evolution·Ross E McMurtrieRichard J Norby
Mar 27, 2013·The New Phytologist·Frank P DayC Ross Hinkle
Mar 19, 2013·Global Change Biology·Andrew R SmithDouglas L Godbold
Oct 12, 2013·Global Change Biology·A Christopher OishiRam Oren
Aug 21, 2013·The New Phytologist·Weixin ChengJulie D Jastrow
Mar 4, 2015·The New Phytologist·Daniel deB Richter, Sharon A Billings
Dec 19, 2014·Environmental Pollution·Xiaona WangTakayoshi Koike
Sep 23, 2014·Applied and Environmental Microbiology·Andrew C ProcterRobert B Jackson
Mar 13, 2014·Applied and Environmental Microbiology·Sean T BerthrongCheryl R Kuske
Aug 5, 2020·Proceedings of the National Academy of Sciences of the United States of America·Laureano A Gherardi, Osvaldo E Sala

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