Production and emission of phosphine gas from wetland ecosystems
Chao Han , Xueyuan Gu , Jinju Geng , Yuning Hong , Rui Zhang , Xiaorong Wang , Shixiang Gao
DOI:
Received October 20, 2009,Revised January 12, 2010, Accepted , Available online
Volume 22,2010,Pages 1309-1311
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Phosphine is a part of an atmospheric link of phosphorus cycle on earth, which could be an important pathway for phosphorus
transport in environment. Wetland ecosystems are important locations for global biogeochemical phosphorus cycle. In this study,
production and emission fluxes of free phosphine from four wetlands types in southern China were observed in di erent seasons. The
results showed that the concentration of phosphine liberated from wetlands was at pg/m3–ng/m3 level. The emission concentrations of
di erent wetlands followed the sequence: paddy field (51.83 3.06) ng/m3 > marsh (46.54 20.55) ng/m3 > lake (37.05 22.74) ng/m3
coastal wetland (1.71 0.73) ng/m3, the positive phosphine emission flux occurred in rice paddy field (6.67 5.18) ng/(m2 hr) and
marsh (6.23 26.9) ng/(m2 hr), while a negative phosphine flux of (–13.11 35.04) ng/(m2 hr) was observed on the water-air interface
of Lake Taihu, suggesting that paddy field and marsh may be important sources for phosphine gas in atmosphere, while lake may be a
sink of atmospheric phosphine gas during the sampling period. Atmospheric phosphine levels and emission flux from Yancheng marsh
and rice paddy field varied in di erent seasons and vegetational zones. Both di usion resistance in aqueous phase and temperature were
dominating factors for the production and transportation of phosphine to atmosphere.
