Seasonal changes of methane emission on black soil rice field in cold region and its DNDC simulation

Abstract

Methane (CH4) emission from black soil rice field has obvious contribution on the greenhouse effect, however, scare investigations was done on the valuable issue. Static chamber method with DNDC simulation is a novel method to study greenhouse gases in rice field. The seasonal changes of methane emission were studied and simulated in a controlled and flooding irrigation by means of field-fixed position test. The results showed that irrigation patterns of methane emission peak has obvious difference, and total methane emission amount in growing season in controlled irrigation mode was about 47%, which was lower than that in flooding irrigation mode. The verification result showed the DNDC model may well describe the methane emission of black soil rice field in cold region. Therefore, controlled irrigation is an effective irrigation mode in reducing CH4 emission from rice field and the DNDC model may be a powerful tool for assessing CH4 emission quantities of black soil rice fields in cold region.