Tham khảo tài liệu 'international perspectives on global environmental change part 11', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Assessment of the Impact of Land-Use Types on the Change of Water Quality in Wenyu River Watershed Beijing China 289 Water Quality Parameters Regression Equations R Value R Square Std. Error of the Estimate Total Nitrogen tN Predictors Forest Urban Village and Water Equation Ln TN Nitrate NO3- N Predictors Forest Urban Village and Bare Equation NO3- N Note The independent variables of Forest Urban and Water were natural log-transformed because their normality assumptions were not met Table 7. Regression equations developed for TN and NO3-N in Wenyu River Watershed. Fig. 9. Goodness-of-fit of statistical models for six water quality variables prediction. The results can provide insight into the linkage between land-use types and stream water quality. The regression models have used in several ways by environmental planners and others interested in watershed management. The models can help examine the relative sensitivity of water quality variables to alterations in land-use types within a watershed. If the pattern of land-use changed the levels of contaminants should be changed accordingly. Only with a better land-use planning it is able to reduce the water quality deterioration. Water quality changes with land-use types In the study we also examined the changes of water quality in relation to the changes of land-use types in the Wenyu River watershed. It is very clear that most of water quality variables were degraded from 2000 to 2008. For example both TN and TP increased 290 International Perspectives on Global Environmental Change relatively high in farmland urban and village areas but very little change in forest areas. Since urban areas are dramatically increasing from 2000 to 2008 their impacts on TN and TP are quite obvious. These results not only provide the linkages between land-use types and stream water quality
