A vegetation configuration pattern with a high-efficiency purification ability for TN, TP, AN, AP, and COD based on comprehensive assessment results

摘要

To identify a vegetation configuration pattern with a high-efficiency purification ability for total nitrogen (TN), available nitrogen (AN), total phosphorous (TP), available phosphorous (AP), and chemical oxygen demand (COD) based on comprehensive assessment results, a water discharge experiment was performed in the Luan River in China with the following riparian forests: I, pure broad-leaved; II, mixed broad-leaved; III, mixed coniferous and broad-leaved; IV, mixed coniferous; and V, pure coniferous. From the riparian buffer zone to the river channel, the evaluation showed that pattern I had the highest purification ability at 1?m and 2?m; at a width of 4?m, pattern III had the highest purification ability; at a distance of 7?m, pattern V showed the highest purification ability; at 10?m, pattern IV showed the highest purification ability, pattern II the lowest. It is advisable to give priority to plant coniferous species from 0?m to 4?m from the river bank, while it is advisable to give priority to plant broad-leaved species from 4?m to 10?m from the river bank. We therefore recommend these vegetation configuration patterns in the development and management of runoff purification systems.