No abstract

Here we have investigated the emission of carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O) from long-and short-term organic farming Andosols in Matsumoto city of Nagano, in central Japan. We focus on three upland plots in Matsumoto, distinguished by how long they had each experienced continuous organic farming ( , respectively. Greenhouse gas (GHG) balance was calculated at -52 and 97 g CO 2 -C equivalent m -2 in M39-OF and M1F-OF, respectively. Negative GHG balance indicated that M39-OF was acting as a GHG sink, with higher CH 4 absorption than M1F-OF. Further, this beneficial function for global warming was thought to be based on its cultivation system, which had included green manure application since 2001. The difference in gas exchange between incubation and field experiments was considered a reason for the difference in N 2 O emission between incubation and field experiments.