Effects of nitrogen and biochar amendment on soil methane concentration profiles and diffusion in a rice-wheat annual rotation system.

ABSTRACT: The CH₄ emissions from soil were influenced by the changeable CH₄ concentrations and diffusions in soil profiles, but that have been subjected to nitrogen (N) and biochar amendment over seasonal and annual time frames. Accordingly, a two-year field experiment was conducted in southeastern China to determine the amendment effects on CH₄ concentrations and diffusive effluxes as measured by a multilevel sampling probe in paddy soil during two cycles of rice-wheat rotations. The results showed that the top 7-cm soil layers were the primary CH₄ production sites during the rice-growing seasons. This layer acted as the source of CH₄ generation and diffusion, and the deeper soil layers and the wheat season soil acted as the sink. N fertilizati

SUBMITTER: Xu X 

PROVIDER: S-EPMC5144129 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature