氮肥料也大量运用在自然生态系统中。 由于化石生物的燃烧而产生的一氧化氮也超过了自然界释放的总量。
Likewise, more nitrogen fertilizer is applied in agriculture than is fixed naturally in all terrestrial ecosystems, and nitric-oxide production from the burning of fossil fuels and biomass also surpasses natural emissions.