ZL-Conclusion
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From the discussion above, I conclude several points:
- Watershed integrity influence the water quality, the pollutant content from upstream will flow down to the downstream.
- Pollutant content is hard to decomposed by water, since during the flowing down to the downstream, the pollution level is still high.
- Scientist should pay more attention to the sampling site where has the measure level higher than the upper limit, especially in recent years.
- The possible reasons of the change of trend of each measure are:
- Climatical cause may lead to the measure level drop down fast in one month or quarter.
- If one or several measures sudden rise a lot in the same period, maybe there is a factory drain sewage into the water.