z-logo
Premium
Effects of elevated ozone concentration on methane emission from a rice paddy in Yangtze River Delta, China
Author(s) -
ZHENG FEIXIANG,
WANG XIAOKE,
LU FEI,
HOU PEIQIANG,
ZHANG WEIWEI,
DUAN XIAONAN,
ZHOU XIAOPING,
AI YONGPING,
ZHENG HUA,
OUYANG ZHIYUN,
FENG ZONGWEI
Publication year - 2011
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1111/j.1365-2486.2010.02258.x
Subject(s) - paddy field , ozone , fumigation , methane , charcoal , yangtze river , zoology , environmental chemistry , delta , environmental science , chemistry , agronomy , china , biology , organic chemistry , engineering , political science , law , aerospace engineering
Few investigations have been made on the impact of elevated ozone (O 3 ) concentration on methane (CH 4 ) emission from rice paddies. Using open‐top chambers in situ with different O 3 treatments, CH 4 emissions were measured in a rice paddy in Yangtze River Delta, China in 2007 and 2008. There were four treatments applied: charcoal‐filtered air (CF), nonfiltered air (NF), and charcoal‐filtered air with different O 3 additions (O 3 ‐1 and O 3 ‐2). The mean O 3 concentrations during the O 3 fumigation were 19.7, 22.6, 69.6 and 118.6 ppb in 2007 and 7.0, 17.4, 82.2 and 138.3 ppb in 2008 for treatments CF, NF, O 3 ‐1 and O 3 ‐2, respectively. The rice yields, as compared with CF, were reduced by 32.8% and 37.1%, 58.3% and 52.1% in treatments O 3 ‐1 and O 3 ‐2 in 2007 and 2008, respectively. The diurnal patterns of CH 4 emission varied temporally with treatments and there was inconsistence in diurnal variations in CH 4 emissions from the paddy field. The daily mean CH 4 emissions were significantly lower in treatments O 3 ‐1 and O 3 ‐2 than those in treatments CF and NF. Compared with CF treatment, CH 4 emissions from the paddy field were decreased to 46.5% and 38.3%, 50.6% and 46.8% under treatments O 3 ‐1 and O 3 ‐2 in the whole growing seasons of 2007 and 2008, respectively. The seasonal mean CH 4 emissions were negatively related with AOT40 (accumulative O 3 concentration above 40 ppb; P < 0.01 in both years), but positively related to the relative rice yield (reference to CF; P < 0.01 in 2007 and P < 0.001 in 2008), aboveground biomass ( P < 0.01 in both years) and underground biomass ( P < 0.01 in 2007 and P < 0.05 in 2008). The decreased CH 4 emission from the rice paddy due to an increased O 3 exposure might partially mitigate the global warming potential induced by soil carbon loss under elevated O 3 concentrations.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here