Open AccessEffect of Scirpus mariqueter on nitrous oxide emissions from a subtropical monsoon estuarine wetland
Author(s) -
Yu Zhongjie,
Li Yangjie,
Deng Huanguang,
Wang Dongqi,
Chen Zhenlou,
Xu Shiyuan
Publication year - 2012
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2011jg001850
Subject(s) - nitrous oxide , environmental science , flux (metallurgy) , atmospheric sciences , sink (geography) , environmental chemistry , eddy covariance , photosynthesis , denitrification , scirpus , nitrate , wetland , hydrology (agriculture) , chemistry , nitrogen , ecosystem , ecology , physics , biology , geology , cartography , geotechnical engineering , organic chemistry , geography , biochemistry
The effects of the wetland plant Scirpus mariqueter on nitrous oxide (N 2 O) emissions in Yangtze estuary, China, were investigated using an in situ static chamber technique. Field measurements spanned the entire growing season (May to October) and encompassed a wide range of weather conditions typical of the subtropical monsoon climate of this region. Simultaneous measurement of carbon dioxide (CO 2 ) and anatomical measurements were conducted to experimentally determine the gas transport mechanisms of S. mariqueter on N 2 O flux. S. mariqueter had a significant effect on N 2 O flux. Based on the comparison of light‐dark and clipped‐unclipped gas flux, N 2 O flux was negatively correlated with NEE ( p < 0.0001) and NPP ( p < 0.001) under light conditions when S. mariqueter was present but positively with temperatures in the dark condition or when S. mariqueter was clipped. Besides the plant uptake corresponding to the N 2 O negative flux in light chamber, it is reasonable to assume that because of the limitation of nitrate in sediment, coupled nitrification‐denitrification is the main process of N 2 O producing. O 2 transported into the S. mariqueter rhizosphere during photosynthesis stimulated denitrifier also would consume the N 2 O and would be induced to the N 2 O diffusing from atmosphere into sediment. Although photosynthetic activity of S. mariqueter attenuated N 2 O flux significantly over the course of the entire study period, creating a net sink for atmospheric N 2 O under light condition, the marsh of Chongming Island Dongtan wetland was a net source of atmospheric N 2 O during the active S. mariqueter growth phase (averaged flux was 98.3 μ g N 2 O m −2 h −1 ).