Archive > Volume 36 Issue 4 > 1999,36(4):484-491. DOI:10.11766/trxb199803220408 CSTR:[cstr] Prev Next
EFFECTS OF WATER REGIME ON CO2, CH4 AND N2O EMISSIONS AND OVERALL POTENTIAL FOR GREENHOUSE EFFECT CAUSED BY EMITTED GASES
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Abstract:
The results from a laboratory experiment showed that the composition and total amount of CO2, CH4 and N2O emitted from a clayey soil were affected significantly by water regime and amendment of wheat straw. Under the flooded conditions, the emission was small for N2O, but large for CH4,and CO2; in contrast, under the aerobic conditions, the emission was not detectable for CH4,but large for N2O; the drainage of flooded water acceleseted N2O emission, but depressed CH4 emission. And the emissions of CO2, CH4 and N2O under the flooded/drained alternate conditions were the middles between those under flooded conditions and under aerobic conditions. The overall potential for greenhouse effect (OPGE) caused by the emitted greenhouse gases, calculated according to their potential in absorbing thermal radiation, was the highest under the flooded conditions and the lowest under the flooded/drained alternate conditions. It clearly demonstrated that the change in water regime would not only alter the composition of greenhouse gases emitted from soil but OPGE as well.
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