Craes weijing-watershed classification in taizi river


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Craes weijing-watershed classification in taizi river

  1. 1. Watershed classification in Taizi River 孔维静 Chinese Research Academy of Environmental Sciences
  2. 2. Outline• 1. Natural, geographical and freshwater ecosystem features in Taizi river watershed• 2. Why classification• 3. Method• 4. Results
  3. 3. 1.1Overview 40° 29′ -41°40′N 122 ° 25 ′-124 ° 55 ′E Temperate continental monsoon climate Area: 12,000KM2 Province: Liaoning
  4. 4. 1.2 Environment variables for Taizi river watershed Geomorphology Soil type DEMAnnual average temperature Annual average rainfall Vegetation
  5. 5. 1.3 Environmental variables and its ecological importanceEnvironment Rationale variablesTemperature Determines the spatial pattern of species distributionPrecipitation Related to watershed water cycle and water resource distribution, determining species distribution, ecosystem process and dynamicsDEM Related to temperature, rainfall and hydrology, influencing species distribution, freshwater ecosystem type, spatial pattern and ecosystem processSoil Related to water cycle, influencing hydrological process, biogeochemical process and freshwater ecosystem structure and functionVegetation Offering habitat for freshwater organisms, related to water temperature adjustment, sunlight penetration, soil erosion and biogeochemical process; influencing freshwater ecosystem structure and functionSlope Related to regional or local macro-habitat, influencing freshwater structure and function Environmental variables influence freshwater ecosystem
  6. 6. 1.4 Freshwater ecosystem: Macroinvertebrate community structure Individuals Species Dominant species Individuals, species and dominant species for macroinvertebrate are different among Taizi river watershed
  7. 7. 1.5 Freshwater ecosystem: Fish community structure Individuals SpeciesIndividuals, species anddominant species for fishes aredifferent among Taizi riverwatershed Dominant Species
  8. 8. 1.6 Freshwater ecosystem: Alage community structure Individuals Species Individuals and species for algae are different among Taizi river watershed
  9. 9. 1.7 Results• Environmental variables changes from the upper Taizi river to lower Taizi river• Freshwater community structure changes from the upper Taizi river to lower Taizi river
  10. 10. 2. Why classification• Spatial heterogeneity of environmental variables• Spatial heterogeneity of freshwater ecosystem structure• Base for river health assessment• Management demands
  11. 11. 3. Method---classification schemeData source:DEM,slope,aspect, vegetation type,soil type,annual averagetemperature,annual rainfall,annual evaporation;NDVI aquatic Correlation Analysis between Geostatistic Qualitative organisms aquatic organisms and analysis of spatial analysis survey data environmental variables distribution pattern cluster Environmental Indices chosen for the classification ISODATA unsupervised classification results Aquatic organisms Modify with aquatic Small catchments boundary cluster map organisms cluster map Final classification map
  12. 12. 4.1 Results Relationship between freshwater organisms and environmental factorsEnvironmental variables influences freshwater ecosystem structure, so itspattern can be used to reflect the freshwater ecosystem pattern in Taizi riverwatershed
  13. 13. 4.2 Results Spatial autocorrelation range calculated from geostatistic NDVI DEM slope Annual Annual Annual Evaporation Temperature PrecipitationRange 101.28 KM 84.43 KM 132.1 KM 87.28 KM 100.3 KM 92.37 KM DEM and precipitation were suitable for the classification Database Annual average rainfall DEM
  14. 14. 4.3 Results ISODATA unsupervised classification results in ERDAS
  15. 15. 4.4 Results Check with freshwater organisms and boundary revision Freshwater organisms Classification by Small watershed pattern natural attributes boundaryⅢ Plain agriculture region Ⅰ Mountainous forest region Ⅱ Hill forest region
  16. 16. 4.5 Ⅰ Mountainous forest region Region Watershed features River feature Freshwater ecosystemMountainous Area: 4557KM2, Mean river width 14.79 m (0.5-100m); Dominant fishes: Leuciscus waleckii、forest Mean DEM: 511m; Mean substrate index: 3.6 (1-4.8);Mean Cottus pollux, Odontobutis obscurus;region Annual average temperature: suspended solid: 33.7mg/L (3.5~ Dominant macroinvertebrate: 2.28-7.75; 347mg/L);Mean DO: 10.8 mg/L (4.3~ Ecdyonurus viridis, Paraleptophlebia Annual average precipitation: 15.6 mg/L); Mean conductivity: 183μs/cm japonica;Above ground herbaceous 786-954mm (11.7~826μs/cm) biomass: 1.04kg/m2,belowground: 0.55 kg/m2,Total: 1.68 kg/m2
  17. 17. 4.6 Ⅱ Hill forest regionRegion Watershed features River features Freshwater ecosystemHill Area: 3896KM2; Mean river width: 44.4m (0.3-300m); Dominant fishes: Ctenogobius brunneus,forest Mean DEM: 282m; Mean substrate index: 3.4(1-4.4); Hemicculter Leuciclus, Mean annual temperature: 6.9℃ Squalidus chankaensis;region Mean suspended solid: 30.3 mg/L(5.5~ (4.38-9.22℃); Dominant macroinvertebrate: 81.5 mg/L) ; Mean annual average precipitation: Cheumatopsyche sp., Antocha sp., and Mean DO: 9.4mg/L (3.5~14.6 mg/L); 784mm(717-868mm) Beatis thermicus; Mean conductivity: 336.8μs/cm (57~ Above ground herbaceous biomass: 566μs/cm) 1.25kg/m2,belowground: 0.72 kg/m2, Total: 1.97 kg/m2
  18. 18. 4.7 Ⅲ Plain agriculture region Regions Watershed features River features Freshwater ecosystemPlain Area: 4749KM2; Mean river width: 84m(1-400m); Almost no fish, occasionalagriculture Mean DEM: 65m; Mean substrate index: 2.1(1-4.2); species Ctenogobiusgiurinus;region Mean annual temperature: Mean suspended solid: 32.3 Above ground herbaceous 8.6℃(4.9-10℃); mg/L(3.5~109 mg/L); biomass: 1.51kg/m2, mean annual precipitation: Mean DO: 6.4 mg/L(0.4-13mg/L); belowground: 0.93 kg/m2, 708.8 mm (653.6-775.1mm) Mean conductivity: 515μs/cm(177~ Total: 2.45 kg/m2 1126μs/cm)
  19. 19. Thanks for your attention!