A field experiment on the Swiss Plateau was
designed to measure the greenhouse gas (GHG) budget of two parallel fields
after conversion from arable crop rotation to cut grassland and managed either
intensively or extensively. Measurements of N2O fluxes with chambers
and of CO2 with eddy flux towers were complemented by estimates of
C-imports (organic fertilizers) and C-exports (yield). The results indicate
that newly established grassland plots act as a net GHG sink when management
intensity (fertilization and cutting) is high, while conversion to extensive
grasslands leads to an initial net loss of GHG.
Author: J. Fuhrer, C. Ammann, C. Flechard, J. Leifeld, et al (juerg dot fuhrer at fal dot admin dot ch)
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