Dissolved carbon leaching from an Irish cropland soil is increased by reduced tillage and cover cropping
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Dissolved carbon leaching from an Irish cropland soil is increased by reduced tillage and cover cropping. / Walmsley, David C.; Siemens, Jan; Kindler, Reimo et al.
in: Agriculture, Ecosystems and Environment, Jahrgang 142, Nr. 3-4, 08.2011, S. 393-402.Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Dissolved carbon leaching from an Irish cropland soil is increased by reduced tillage and cover cropping
AU - Walmsley, David C.
AU - Siemens, Jan
AU - Kindler, Reimo
AU - Kirwan, Laura
AU - Saunders, Matthew
AU - Kaupenjohann, Martin
AU - Osborne, Bruce A.
AU - Kaiser, Klaus
PY - 2011/8
Y1 - 2011/8
N2 - Reduced tillage and cover cropping are often considered as measures to increase carbon sequestration in cropland soils. We hypothesized that these management practices could result in an increase in carbon leaching. To examine this possibility we assessed carbon leaching from an Irish arable soil under spring barley, either with conventional management or non-inversion tillage plus cover cropping. Concentrations of biogenic dissolved inorganic carbon (DIC) were considerably higher under reduced tillage probably due to a higher supersaturation of soil solution with respect to partial pressures of CO2 in soil air resulting from a reduced abundance of tillage-induced macropores. Leaching losses of DOC equalled 3 ± 0.3 g m−2 yr−1 for conventional management as well as for non-inversion tillage plus cover cropping. Losses of biogenic DIC were 14.5 ± 4.4 g m−2 yr−1 for conventional tillage and 34.0 ± 4.7 g m−2 yr−1 for non-inversion tillage plus cover crop. Higher leaching losses from the non-inversion tillage plus cover crop plot thereby reduced potential soil carbon gains by 20 g m−2 yr−1 compared to the conventionally managed treatment highlighting the need to consider leaching losses in estimates of carbon sequestration, especially if these are deduced from balancing carbon inputs and outputs.
AB - Reduced tillage and cover cropping are often considered as measures to increase carbon sequestration in cropland soils. We hypothesized that these management practices could result in an increase in carbon leaching. To examine this possibility we assessed carbon leaching from an Irish arable soil under spring barley, either with conventional management or non-inversion tillage plus cover cropping. Concentrations of biogenic dissolved inorganic carbon (DIC) were considerably higher under reduced tillage probably due to a higher supersaturation of soil solution with respect to partial pressures of CO2 in soil air resulting from a reduced abundance of tillage-induced macropores. Leaching losses of DOC equalled 3 ± 0.3 g m−2 yr−1 for conventional management as well as for non-inversion tillage plus cover cropping. Losses of biogenic DIC were 14.5 ± 4.4 g m−2 yr−1 for conventional tillage and 34.0 ± 4.7 g m−2 yr−1 for non-inversion tillage plus cover crop. Higher leaching losses from the non-inversion tillage plus cover crop plot thereby reduced potential soil carbon gains by 20 g m−2 yr−1 compared to the conventionally managed treatment highlighting the need to consider leaching losses in estimates of carbon sequestration, especially if these are deduced from balancing carbon inputs and outputs.
KW - Ecosystems Research
KW - DOC
KW - DIC
KW - Carbon sequestration
KW - Tillage
KW - Net ecosystem carbon balance
KW - Conservation agriculture
UR - http://www.scopus.com/inward/record.url?scp=80051582149&partnerID=8YFLogxK
U2 - 10.1016/j.agee.2011.06.011
DO - 10.1016/j.agee.2011.06.011
M3 - Journal articles
VL - 142
SP - 393
EP - 402
JO - Agriculture, Ecosystems and Environment
JF - Agriculture, Ecosystems and Environment
SN - 0167-8809
IS - 3-4
ER -