[Long-term fertilization on the behavior of aging of the phenanthrene in the black soil aggregates].

The soil samples were collected from the surface (0-20 cm) soil of the long-term fertilizer experiments in black soil areas in Northeast Location Monitoring Field [fertilizers and organic fertilizers (NPOM), no fertilization (NF)], and indoor culture method was adopted to study the behaviour of aging of the phenanthrene different size of soil aggregates and its contributing factors of aging source analysis. The results show that in the beginning of the aging > 2 mm aggregate fraction was a priority adsorbent, while last stage of the aging < 0.053 mm aggregate fraction was the preferred adsorbent. In the 120-day aging period, the extraction rate of 0.25-0.053 mm and 0.25-2 mm aggregate fraction had no significant difference. The phenanthrene residual content in undisturbed soil of NPOM treatment was 31.13%, while in the NF treatment residual content of undisturbed soil was 27.73%. Average rates of the phenanthrene aging in the NPOM and NF treatments was 0.26% x d(-1) and 0.23% x d(-1). The five major influence factors of the combination of content of the residual phenanthrene based on principal component analysis were analyzed, the results showed that the organic carbon and specific surface area were the mainly factors combined with residual content of phenanthrene. As a consequence, Long-term application of fertilizers was in favour of the aging behaviour of phenanthrene, thereby reducing the activity and toxicity of phenanthrene in the black soil.