[Effects of Controlled-Release Urea Application on NO Emission in Maize-Cultivated Sandy Loam Soil].

A field experiment was conducted in maize-cultivated sandy loam soil in the old flooded area of the Yellow River to evaluate the responses of NO emissions to application of different type of controlled-release urea. An inorganic N fertilizer was applied at 270 kg·hm during the maize season. Urea was applied alone and in combination with sulfur-coated urea (SCU) or polyurethane-coated urea (PCU) at N ratios of 30%:70%, 50%:50%, and 70%:30%, respectively.

[Research progresses on methanogenesis pathway and methanogens in coastal wetlands].

Coastal wetlands contribute about 75% to the global oceanic CH emissions, thus play a vital role in global C cycles. In this paper, we provided a perspective on researches on metabolic, phylogenetic, and ecological diversity of the methanogenic archaea and the regulating environmental factors in coastal wetlands. Because of the presence of more favorable electron acceptors such as sulfate, methanogenesis via CO reduction and acetate fermentation are limited by availability of substrates, and hydrogenotrophic and acetotrophic methanogens generally express low relative abundance.