Responses of Carbon Dynamics to Nitrogen Deposition in Typical Freshwater Wetland of Sanjiang Plain. (11th November 2014)

• Record Type: Journal Article
• Authors: Wang, Yang; Liu, Jingshuang; He, Longxue; Dou, Jingxin; Zhao, Hongmei
• Other Names: Yu Junbao Academic Editor.
• Is Part Of: Journal of chemistry. Volume 2014(2014)
• Publication Date: 2014-11-11
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1155/2014/603948
• Languages: English
• ISSNs: 2090-9063

Abstract

Abstract : The effects of nitrogen deposition (N-deposition) on the carbon dynamics in typical Calamagrostis angustifolia wetland of Sanjiang Plain were studied by a pot-culture experiment during two continuous plant growing seasons. Elevated atmospheric N-deposition caused significant increases in the aboveground net primary production and root biomass; moreover, a preferential partition of carbon to root was also observed. Different soil carbon fractions gained due to elevated N-deposition and their response intensities followed the sequence of labile carbon > dissolved organic carbon > microbial biomass carbon, and the interaction between N-deposition and flooded condition facilitated the release of different carbon fractions. Positive correlations were found between CO2 and CH4 fluxes and liable carbon contents with N-deposition, and flooded condition also tended to facilitate CH4 fluxes and to inhibit the CO2 fluxes with N-deposition. The increases in soil carbon fractions occurring in the nitrogen treatments were significantly correlated with increases in root, aboveground parts, total biomass, and their carbon uptake. Our results suggested that N-deposition could enhance the contents of active carbon fractions in soil system and carbon accumulation in plant of the freshwater wetlands.