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ABSTRACT: Methane (CH4) and nitrous oxide (N2O) emissions from rice field in black soil were measured in situ by using static chamber techniques during crop growth season in 2001. The experiment fields were divided into three plots
for three different treatments, one with continuous flooded and applying urea (CU), one with continuous flooded and applying
slow-releasing urea (CS), and one with intermittent irrigation and applying urea (IU). Under the same fertilization application,
compared with continuous flooded, intermittent irrigation can significantly reduce CH4 emission and increase N2O emission. But, integrated global warming potentials (GWPS) of CH4 and N2O emission were reduced greatly, while rice yield was not affected. So, the intermittent irrigation is an effective measure
to reduce greenhouse gas emissions from paddy fields. The amount of CH4 emission during rice-growing season for the three treatments was all much lower than that from any other region in China.
There was a trade-off relationship between CH4 and N2O emissions. We also measured the numbers of methanogens, methanotrophs, nitrifiers and denitrifers from rice field at various
growth stages in 2001. Bacteria populations were estimated by the most probable number (MPN) method. Regression analyses show
CH4 emissions were closely related to methanogens population for all the three treatments. There was a positive correlation between
denitrifiers population level and N2O emission in the treatment of IU.
Nutrient Cycling in Agroecosystems 04/2012; 73(2):293-301. · 1.79 Impact Factor
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ABSTRACT: Samples were collected from dark-brown forest soil in different depths in the virgin broad-leaved/Korean pine mixed forest in Changbai Mountain. Laboratory study on methane oxidation of forest soil revealed the vertical profiles of methane oxidation activity. The maximum methane oxidation occurred at the horizon 5-15 cm below the soil surface. When incubated with 400 ppmv methane, it had the highest uptake rate of 3.3 nmol.h-1.g-1 dw. Soil at horizon below 25 cm had a negligible capacity to oxidize methane. The methane-oxidation capacity of surface soil (0-5 cm) decreased because of the inhibition effect of high concentration NH4+ on methanotrophs.
Ying yong sheng tai xue bao = The journal of applied ecology / Zhongguo sheng tai xue xue hui, Zhongguo ke xue yuan Shenyang ying yong sheng tai yan jiu suo zhu ban 01/2004; 14(12):2269-72.
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ABSTRACT: The measurements of soil microbial biomass C, respiration rate and CH4 emissions during one rice growth period in black earth rice fields showed that the soil microbial biomass C and respiration rate were depressed significantly by the application of slow-releasing urea at the early stage of rice growth period (P < 0.05), but almost not affected by intermittent irrigation. The CH4 emission was decreased by 32.5% in the intermittent irrigation treatments, but not significantly affected by the application of slow-releasing urea, compared to the control. It was significantly related to soil microbial biomass C in slow-releasing urea treatments.
Ying yong sheng tai xue bao = The journal of applied ecology / Zhongguo sheng tai xue xue hui, Zhongguo ke xue yuan Shenyang ying yong sheng tai yan jiu suo zhu ban 12/2003; 14(12):2278-80.
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ABSTRACT: Determinations on the CH4 and N2O emissions from phaeozem rice field showed that their emission amount in rice growing season was much lower than any other regions in China. There was trade-off relationship between CH4 and N2O emissions(r = -0.513, P < 0.05). Under the same fertilization, compared with continual irrigation, intermittent irrigation could reduce significantly CH4 emission and increase N2O emission, but the overall warming potential of greenhouse effect was reduced greatly, while rice yield was not affected. Therefore, intermittent irrigation was an effective irrigation measures to reduce greenhouse gas emissions from rice field. In addition, investigations on CH4 and N2O emissions and their related microbial process showed a positive relation between methanogens number and CH4 emission(R2 = 0.82, P < 0.05), and the important relationship between the numbers of nitrifiers and denitrifiers and N2O emissions.
Ying yong sheng tai xue bao = The journal of applied ecology / Zhongguo sheng tai xue xue hui, Zhongguo ke xue yuan Shenyang ying yong sheng tai yan jiu suo zhu ban 11/2003; 14(11):2015-8.
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ABSTRACT: Methane (CH4) is one of the main greenhouse gases contributing greenhouse effect, and its potential greenhouse effect is 21 times of CO2. Therefore, to determine the sources and sinks of atmospheric CH4 and to assess and forecast their amounts become and important focus concerning the researches on global change and greenhouse effect. This paper summarized the researches on the sources and sinks of CH4, and amplified on the influential factors (e.g. land-use, ambient atmospheric CH4 concentration, soil temperature, soil moisture content, soil pH and soil porosity) on atmospheric and interior CH4 oxidation in soil. It is significant that studying CH4 oxidation in vertical zonation soil in forests of Changbai Mountain to evaluate the CH4 consumption in forest soil.
Ying yong sheng tai xue bao = The journal of applied ecology / Zhongguo sheng tai xue xue hui, Zhongguo ke xue yuan Shenyang ying yong sheng tai yan jiu suo zhu ban 01/2003; 13(12):1707-12.
