Large differences in CO2 emissions from two dairy farms on a drained peatland driven by contrasting respiration rates during seasonal dry conditions

The Science of the Total Environment
David I CampbellAaron M Wall

Abstract

Drained peatlands are major sources of CO2 to the atmosphere, yet the effects of land management and hydrological extremes have been little-studied at spatial scales relevant to agricultural enterprises. We measured fluxes of CO2 using the eddy covariance (EC) technique at two adjacent dairy farms on a drained peatland in Aotearoa New Zealand with remaining peat depths 5.5-8 m. One site (SD) had shallow surface drains and mean water table depth (WTD) -657 mm, while the other site (BD) had deep field border drains and mean WTD -838 mm. Net ecosystem CO2 production (NEP) was similar at the two sites when the soils were moist but diverged during late-summer drying, with site BD having 4.56 t C ha-1 greater CO2 emission than site SD over the four-month dry period. Soil drying reduced gross primary production (GPP) at both sites, while ecosystem respiration (ER) was reduced at site SD but not at site BD. The low dry season respiration rates at site SD contributed to near-zero annual NEP, while higher respiration rates at site BD led to annual CO2 loss of -4.95 ± 0.59 t C ha-1 yr-1. Accounting for other imports and exports of carbon, annual net ecosystem carbon balances were -2.23 and -8.47 t C ha-1 yr-1 at sites SD and BD, respectiv...Continue Reading

References

Jan 21, 2015·Journal of Environmental Quality·Jack ProngerMalcolm McLeod
Mar 8, 2016·The Science of the Total Environment·Guler Aslan-SungurNusret Karakaya
Apr 1, 2016·Global Change Biology·Bärbel TiemeyerJutta Zeitz

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