Minimisation of N2O emissions from a plant-soil system under landfill leachate irrigation.
The irrigation of a plant-soil system with landfill leachate should promote the formation of N2O due to the introduction of organic carbon and mineralized-N and the elevation of the moisture content. Laboratory incubation was performed to minimize N2O emissions from a leachate irrigated plant-soil system by manipulating leachate NH(4)(+)-N loading, moisture content, and soil type. A field investigation, consisting of three plots planted with Cynodon dactylon, Nerium indicum Mill, and Festuca arundinacea Schreb, was then conducted to select plant species. There was almost no difference in N2O emissions between soil moisture contents of 46% and 55% water-filled pore space (WFPS), while a sharp increase occurred at 70% WFPS. N2O fluxes were significantly correlated with leachate NH4(+)-N loading. Amongst the physiochemical characteristics of the selected nine soils, only soil pH was significantly correlated with N2O fluxes. Compared with fertilizers application in other ecosystems, N2O turnover rate from the plant-soil system under leachate irrigation was relatively lower. Therefore, avoiding high NH4(+)-N loadings and excessively wet conditions (<60% WFPS) and cultivating conifer plants of stronger sunlight penetration with less litter deposit on acidic sandy soil could minimize potential N2O emissions under leachate irrigation.
State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Hou-Hu
HH
Zhang
Pin-Jing
PJ
He
Li-Ming
LM
Shao
Li
L
Yuan
D002244:Carbon / Q000032:analysis; D004784:Environmental Monitoring; D006813:Humidity; D009609:Nitrous Oxide / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D010944:Plants / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D009930:Organic Chemicals; D012987:Soil; D014874:Water Pollutants, Chemical; D014867:Water; D002244:Carbon; D009609:Nitrous Oxide