Expansionofagriculturalactivities,especiallyonthefertilefloodplainhasresultedindegradationofriparianvegetationandbothgroundwaterandsurfacewaterdependantwetlandsystems.HistoricalwaterqualitydataindicatesconcentrationsofTN,NH4+-NandTDShaveallincreasedoverthepast40yearsinthemainstreamofYellowRiver.Thelevelsofpollutionrecordedmaybeexpectedtoselectforonlytoleranttaxa.
农业活动的扩大，特别是在肥沃的河漫滩，导致河岸植被以及依赖地下水和地表水的湿地系统退化。历史水质数据表明，在过去40年中，*河干流总氮、NH4+-N和总溶解固体物的浓度都有所增加。所记录的污染水平可能只适用于耐污染的分类群。
1.TDS：totaldissolvedsolids总溶解固体物
Indeed,thisstudyhasshownthatmacroinvertebrateassemblagesinupperandmiddlereachesoftheYellowRiverweregenerally
