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当土壤非常潮湿或土壤紧密透气性差时,少数土壤微生物为了取得能量,继续生存,它们就把土壤溶液中的亚硝酸盐和硝酸盐变成气态的一氧化二氮,释放到大气中,我们把这个过程称为反硝化作用。从生物体的观点来看,使它们能够在嫌气条件下生存,是有益的。但从农业的观点来看,认为反硝化作用消耗了有效氮素,减少土壤中的全氮量,是有害的。其实反硝化作用也有好处,当它把一氧化二氮释放到涉及同温层反应的大气中时,就可以打破臭氧层,使有益的紫外线辐射到地面上来。也可以用于排除像动物残余物这样废物中的过量
When the soil is very damp or the soil is poorly breathable, a small number of soil microorganisms, in order to obtain energy, continue to survive, and they turn the nitrite and nitrite in the soil solution into gaseous nitrous oxide and release it into the atmosphere. This process is called denitrification. From an organism’s point of view, it is beneficial to enable them to survive in anaerobic conditions. However, from an agricultural point of view, denitrification is thought to consume an effective amount of nitrogen and reduce the amount of total nitrogen in the soil, which is detrimental. In fact, denitrification is also beneficial. When it releases nitrous oxide into the atmosphere involving stratospheric reactions, the ozone layer can be broken down and beneficial ultraviolet radiation can be radiated to the ground. It can also be used to eliminate excess in wastes like animal residues