affective environmental factors on temporal variations of water quality properties in zard river in khuzistan province

todays, the world development is facing serious water quality issues. since protect of water quality and ecosystem healthy is an important aspect of ecohydrology. the present research aimed to analyze the temporal trends of water quality parameters of mashin zard river station in order to planning long term management approaches. in this research, trend of some significant factors of water quality such as k, na, mg, ca, so42, cl, hco3, ph, ec and tds during 1970 to 2013 in iran calendar by the mann-kendall nonparametric statistical test, liu method and piper diagram has been studied. the results showed that four factors such as k, ca, mg and so4 had increasing trends in the study period. whereas, na and cl had decreasing trend. the results of this study showed that there are serious challenges related to water and land management issues. so, these results are essential basis for achieving the important goals of region ecohydrology.