污泥施用下团花与鹅掌藤鲜叶和凋落叶重金属变化

Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》

鲍利安 董晓全 赖明丽 朱会军 吴嘉希 曾曙才 吴道铭

Abstract： This study conducted a large root box experiment with Schefflera arboricola monoculture, Neolamarckia cadamba monoculture, and co-planting of S. arboricola and N. cadamba. The dynamic changes in Cu, Zn, Cd, and Hg content in fresh and litter leaves of S. arboricola and N. cadamba and their litter production were analyzed for three months (September, October, and November 2020 ) after the surface application of 2% (W/W) SS. The relationship between the HM content of fresh leaf and that of litter leaf and the changes in the HM return amount in leaf litter were further analyzed. The results were as follows: (1) N. cadamba had significantly higher Cu content in fresh and litter leaves than that of S. arboricola, while had significantly lower Zn and Cd contents than those of S. arboricola. (2) The fresh leaf of S. arboricola had the lowest Zn content and the highest Hg content in November. (3) The fresh leaf of N. cadamba had the highest Zn, Cd, and Hg contents in November. (4) The Hg content in the litter leaf of co-planting of N. cadamba increased significantly with the time of SS application, while that of Cu, Zn, and Cd contents showed no significance. (5) The Cd content in fresh leaves was significantly and positively correlated with the Hg and Cd contents of leaf litter in S. arboricola in both September and November. (6) The highest yield of leaf litter and the highest return amount of Cu, Zn, Cd, and Hg in S. arboricola occurred one month after SS application (September), while those in N. cadamba occurred two months after SS application (October). In summary, the application time of SS showed a greater effect on the HM contents in fresh leaves of N. cadamba and S. arboricola than those in litter leaves. There was a positive correlation between the Cd content in the fresh leaf and the Cd and Hg contents in the litter leaf of S. arboricola. The HM pollution risk of the litter leaves of S. arboricola and N. cadamba was easy to occur in one month (September) and two months after SS application (October), respectively. This study will provide a reference for safe SS utilization and reasonable litter disposal in the landscape.

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