六龜試驗林中寮溪水質研究

The Chu crack watershed (759 ha) with an average slope of 60% is a part of Liukuei Experimental Forest, and also is a demonstration site for forest ecosystem management fulfilled by Taiwan Forestry Research Institute from 1997. Four hydrologic monitoring stations were established along the Chungliao creek in 1999 to collect hydrologic data, including streamwater quantity, quality, and sediments. Discharge was measured every month by using a current velocity meter. Water samples were also sampled every month and brought back to the laboratory for chemical component and suspended load analysis. In addition, we investigated water quantity and quality at the Chungliao creek varied through out 1999. The highest discharge appeared in August due to storm and typhoon events, while the lowest discharge occurred in the beginning of April. Streamwater chemistry of these four stations is closely related to discharge. Conductivity, pH, Na^+, Ca^(2+), Mg^(2+), SO_4^(2-), and HCO_3^- in streamwater decreased with increase in discharge. However, suspended load, NH_4 andNO_3 increased with increase in discharge Such data of stream water quantity, quality, and sediments are not only useful for forest ecosystem research, but also for environmental monitoring.