大型底栖动物快速评价指数BMWP在太子河流域的应用

大型底栖动物快速生物评价方法可快速判断河流在人为活动影响下的生态状况,对河流健康评价研究和河流保护与管理具有重要的意义。基于太子河46个样点的大型底栖动物监测数据,探讨大型底栖动物生物监测工作组(Biological Monitoring Working Party,BMWP)指数的适用性。采用方差分析研究了BMWP指数对重要水环境参数的响应程度,研究结果表明BMWP指数随地表水水质级别的降低呈显著地下降趋势。利用回归分析研究了BMWP指数与其他生物指数、生境状况的回归关系,结果显示BMWP指数与底栖动物香农多样性指数(R2=0.74)、底栖动物完整性指数(R2=0.85)以及生境质量评估指数(R2=0.60)均呈显著线性回归关系(p0.01),表明BMWP指数可以有效指示与反映不同河段的生物状况及其栖息地质量。利用BMWP指数对采样点进行的河流健康评价结果显示太子河46个采样点中,极好和良好的采样点占45.7%,一般的样点占21.7%,差和极差的样点为32.6%。BMWP指数对河流生态状况指示灵敏,能够准确反映河流健康状况。同时,野外监测、物种鉴定和指数计算简便,是河流健康评价中表征能力较强的快速生物评价指数。

APPLICATION OF THE BIOLOGICAL MONITORING WORKING PARTY (BMWP) SCORE SYSTEM OF MACROINVERTEBRATES FOR RIVER HEALTH IN TAIZI RIVER BASIN

Benthic macroinvertebrates have been widely used in river health assessment. Selection of the fast and effective evaluation indices has important implications for health assessment area or river basin. This research is based on taizi River basin 46 sampling points of benthic macroinvertebrates and environment survey data in Taizi River Basin, through the BMWP sensitive index value revision and assessment of the level of division, single-factor analysis of variance to compare BMWP index values in the different water categories distribution, correlation analysis BMWP index and Shannon-Wiener diversity index and B-IBI index. Finally BMWP index on river health of Taizi River Basin were evaluated. Research results showed that:In general, when the river water becomes worse, BMWP mean was gradually decreased; linear regression analysis showed that, BMWP index with other three indices showed a significant linear regression relationship (R²=0.60-0.85, p<0.01), and could effectively indicate and reflect biological status and habitat quality in different sections. Evaluation on modified BMWP index sampling points showed that:Among Taizi River basin 46 sampling points, excellent and good sampling point accounted for 45.7%, the general sample accounted for 21.7%, and poor and very poor samples was 32.6%. The BMWP index analysis of the applicability showed that BMWP index can reflect the Taizi River basin River health more accurately, with simpler collection and identification than other biological index. BWMP index is a sign of river health assessment ability of rapid biological assessment for future regional assessment of large number of sample points and may provide some reference value.