Methane and carbon dioxide fluxes from poorly drained adjacent cultivated and forest sites

agricultural soils breathing carbon dioxide contenido de agua en el suelo dioxyde de carbone forest soils gas exchange greenhouse gases intercambio de gases metano methane ontario respiration soil chemicophysical properties soil morphological features soil respiration soil temperature soil water content soil water regimes sol agricole suelo forestal surface layers temperatura del suelo teneur en eau du sol trait morphologique du sol