Spatial-temporal trends of water quality and its influence by land use: A case study of the main rivers in Shenzhen
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摘要: 从深圳市的现实研究需求出发,在对地表水体主要水质指标因子分析的基础上,研究了深圳市境内五个集雨面积大于100 km2的河流近10年的水质时空变化特征。然后结合5个流域的土地利用详查数据,应用统计分析和空间分析方法论证了流域内土地利用类型与河流水质关键指标之间的相关关系。研究结果表明,从1996-2004年深圳市5个主要河流的有机物污染程度有不断增加的趋势,不同时间段内5个流域的耕地、园地和建设用地的数量对相应河流水质的有机物污染有明显的正效影响作用。因此为了制定和实施合理的水环境保护对策,需要对流域内土地利用结构进行优化调整,以期构建流域尺度上水土资源协调发展的可行预案。Abstract: With an increasing trend of the urbanization in most domestic cities,urban water environment will be influenced greatly.This paper probes into the spatial-temporal trends of water quality of the five rivers with the watershed area above 100 km2 in Shenzhen city,and explains the correlation relationship between the land use type and the water quality indicator by using the statistical analysis and the spatial analysis.The results show that the water quality of these five rivers from 1996 to 2004 is deteriorated and the land use type of these watersheds has close relationship with different water quality indicators,specially,the usage of arable land,orchard land and construction land will obviously result in the organic pollution of the instream water quality.This study indicates the water resources protection from the perspective of the land structure optimization and land use planning.
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Keywords:
- in-stream water quality /
- spatial-temporal trends /
- land use /
- correlation analysis /
- Shenzhen city
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