植物释放N2O速率及施肥的影响

采用开放式箱法和乙炔抑制技术,研究了大豆、春小麦和谷子3种植物不同生育期的N₂O释放速率以及施肥对春小麦N₂O释放速率的影响.研究发现,3种植物N₂O释放速率不同,但都具有在生长发育的前期阶段逐渐增加,至开花期前后达到高峰,然后又迅速下降的相似变化规律.在相应生育期,大豆表现出比谷子和春小麦更高的N₂O释放速率.不同的施肥量造成春小麦不同的生长状况,其N₂O释放速率也随之不同,过量施肥引起N₂O释放速率增加.

N2O emission by plants and influence of fertilization

It is verified that plant is a new N₂Oemission source. The N₂Oemission rates of soybean, spring wheat and millet at different growing stages and that of spring wheat fertilized at several fertilization levels are measured by using open chamber method and C₂H₂ inhibitory technique. The results indicate that the N₂Oemission rates of these three kinds of plants increase gradually in early growing stages and reach the maxmium before and after blooming stage, and then decrease sharply. Significant difference in N₂Oemission rates among tested plants is found at the relative development stages. Of these plants, soybean shows the hightest N₂Oemission rate. Under different fertilization conditions, both growing status and N₂Oemission rate of spring wheat are different and the excess fertilization rasults in a higher N₂Oemission rate.