水分类型对土壤排放的温室气体组成和综合温室效应的影响

实验室研究表明，土壤排放出的温室气体（ＣＯ２、ＣＨ４和Ｎ２Ｏ）组成及总理显著地受土壤水分类型和施用秸秆的影响。连续淹水条件下，土壤仅排放微理的Ｎ２Ｏ，但排放出大量的Ｃ睡Ｃ敢条件下，土壤不排放Ｃ上键合的但排放出大量的Ｎ２Ｏ；虽然淹水的土壤排水促进Ｎ２Ｏ排放，但显著抑制ＣＨ４的排放，淹水好气交替处理的土壤其排放的ＣＯ２、ＣＨ４和Ｎ２Ｏ均在好气和连续淹水之间。根据各种温室产生温室效应的相对潜力，计算土壤

EFFECTS OF WATER REGIME ON CO2, CH4 AND N2O EMISSIONS AND OVERALL POTENTIAL FOR GREENHOUSE EFFECT CAUSED BY EMITTED GASES

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.