In December 2020,11 sampling sites were set up in the lower reaches of Xijiang River and Bei-jiang River for investigating the community structure of benthic fauna.Benthos-index of biological integrity(B-IBI)was used to evaluate the health status of the river,and the relationship between B-IBI and environmen-tal factors was analyzed.The results showed that the B-IBI in the reference sites were between 0.59 and 4.00,in a moderate to excellent state.The B-IBI in the damaged sites were between 0 and 0.82,in a very poor to good state,among which the proportion of poor and very poor states accounting for 87.5％.There was a signifi-cant negative correlation between the concentration of ammonia nitrogen and B-IBI.Reducing water pollution load was an effective way to promote the recovery of benthic fauna community health.On the basis of the improvement of water quality,the restoration of benthic fauna community should be promoted by creating living environment with pebbles at the bottom of the river,and the restoration of the riparian zone should be strengthened.
关键词
底栖动物/群落结构/底栖动物完整性指数(B-IBI)/河流健康评价/西北江下游
Key words
Benthic fauna/Community struc-ture/Benthos-index of biological integrity(B-IBI)/Health assessment of river/Lower reaches of Xijiang River and Beijiang River
维普
万方数据