The development of Integrated Streamhealth assessment in Taizi River, China --- by applying the land use as main disturbances pilot research Dr. Xiaodong Qu 流域水生态研究室
Agenda1. Background information2. Steps to assess3. Significance
Background information-Research area (Taizi River) North east of China-The fifth biggest watershed in China Around 413km long above13,000 km2 Quick development of Urban Long history industrial and farmland pollution
Incident human water security and biodiversity threatVörösmarty et al., 2010
Background information-Main purpose Development Improve & restore Identify the stressors Management Method Suitable methods to assess
STEPS TO ASSESS-LIAO RIVER1. Classification of watershed2. Construction of conceptual model3. Identification of stressors and indicators4. Sampling procedures5. Quantification-stressors & indicators6. Target and threshold setting7. Scoring for Assessment and reporting8. Connecting to the management
Step 1-Classification DEM, A-T, A-R(similar stream habitat and orders)
Step 2-Conceptual model Upper Mountain Stream region (M-S)
Step 2-Conceptual model Middle Hilly Stream region (H-S)
Step 3- Identifying the stressor and Indicators
Step 6. Target & thresholda) Lower Considerable High b) High Considerable Lower stress stress stress stress stress stress Frequency 5th percentile median median 95th percentile Indicator values Indicator values Observed values of an indicator may be used to inform decisions about target and threshold values for aquatic ecosystem health.
Step 7. Scoring The standardise scores from 0 to 1 was used: 1=health condition equal to or over the target value 0=disaster condition lower than the threshold value a) Site index score = 1-(target-obs)/(target-threshold) For negative trends with the stressor or b) Site index score = 1-(obs-target)/(threshold-target) For positive trends with the stressor
Step 8. Connection with Management What kind of information we can give to the stream manager? Challenges: 1) The low monitoring data of the aquatic organisms 2) Methods to improve the stream health and restoration 3) Suitable indicators for the local government
Step 8. Connection with Management What kind of information the stream manager need? Challenges: 1) Be aware of the importance of the biological assessment 2) The join in of the local residents 3) The communication-Liao River Reserve & Liao River Research Center (CRAES)
Step 8. Connection with Management 520 km long
SIGNIFICANCE Up to now, the river health assessment mainly based on the water quality monitoring. As we known, the river health is always more than the health of water quality based on the all over world research (US-EPA, Europe-EWF). A new river health assessment program is under development by MEP, and would be promoted for whole country (over US$1.5 Billion for the next ten years). In the future, our research results and methods would be highly recommended. This workshop had provided an excellent chance to share the experience for the river health assessment, and examples for the national river systems biological monitoring.