![]() ![]() ![]() Phil Trans Royal Soc B 367(1593):1226–1234īeaulieu JJ, Arango CP, Tank JL (2009) The effects of season and agriculture on nitrous oxide production in headwater streams. J Hydrol 493(17):30–42īakken LR, Bergaust L, Liu BB, Frostegård A (2012) Regulation of denitrification at the cellular level: a clue to the understanding of N 2O emissions from soils. J Soils Sediments 15(5):1246–1255Ītkins ML, Santos IR, Ruiz-Halpem S, Maher DT (2013) Carbon dioxide dynamics driven by groundwater discharge in a coastal floodplain creek. Soil Biol Biochem 39(2):622–631Īnderson MA, Martinez D (2015) Methane gas in lake bottom sediments quantified using acoustic backscatter strength. Microb Ecol 50(4):529–535Īllen DE, Dalal RC, Rennenberg H, Meyer RL, Reeves S, Schmidt S (2007) Spatial and temporal variation of nitrous oxide and methane flux between subtropical mangrove sediments and the atmosphere. J Limnol 60(1):79–90Īlgesten G, Sobek S, Bergström AK, Anders J, Tranvik L, Jansson M (2005) Contribution of sediment respiration to summer CO 2 emission from low productive and subarctic lakes. Springer, BerlinĪdams DD, Baudo R (2001) Gases (CH 4, CO 2 and N 2) and pore water chemistry in the surface sediments of Lake Orta, Italy: acidification effects on C and N gas cycling. In: Tremblay A, Varfalvy L, Roehm C, Garneau M (eds) Greenhouse gas emissions-fluxes and processes. Human sewage discharge has greatly affected the carbon and nitrogen cycling of urban rivers.Īdams DD (2005) Diffuse flux of greenhouse gases-methane and carbon dioxide-at the sediment-water interface of some lakes and reservoirs of the world. River sediment can be either a sink or a source of greenhouse gases, which varies in different levels of pollution and different seasons. The main influencing factor for CO 2 and N 2O diffusive fluxes was the water temperature of the overlying water however, the key factors for CH 4 diffusive fluxes were the Eh of the sediment and the NH 4 +-N of the overlying water. There were positive correlations among the CO 2, CH 4 and N 2O diffusive fluxes. On average for the whole year, the river sediment was the sink of CO 2 and the source of CH 4 and N 2O. As a general rule, the more serious the river pollution was, the greater the diffusive fluxes of the greenhouse gases were. The spatial variation of the N 2O diffusive fluxes in the sewage-draining rivers and the natural rivers was the most significant. The annual mean values of the CO 2, CH 4 and N 2O diffusive fluxes at the sewage-draining river sediment–water interface were − 123.26 ± 233.78 μmol m −2 h −1, 1.88 ± 6.89 μmol m −2 h −.03 ± 2388.46 nmol m −2 h −1, respectively, which were 1.22, 4.37 and 134.50 times those at the natural river sediment–water interface, respectively. The mean absolute value of the CO 2 diffusive fluxes was seasonally variable with spring>winter>fall>summer, while the mean absolute values of the CH 4 and N 2O diffusive fluxes were both higher in summer and winter, and lower in fall and spring. The greenhouse gas diffusive fluxes at the sediment–water interface exhibited obvious spatiotemporal variations. Sewage-draining rivers were more seriously polluted by human sewage discharge than natural rivers. The influence of environmental variables on greenhouse gas diffusive fluxes was evaluated by Spearman’s correlation analysis and a multiple stepwise regression analysis. Greenhouse gas diffusive fluxes at the sediment–water interface of rivers in Tianjin city (Haihe watershed) were investigated during July and October 2014, and January and April 2015 by laboratory incubation experiments. The purposes of this study were to analyse the spatiotemporal variations in greenhouse gas diffusive fluxes at the sediment–water interface of sewage-draining rivers and natural rivers, and investigate the factors responsible for the changes in greenhouse gas diffusive fluxes. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |