| 密云水库上游白河地表水质对不同空间尺度景观格局特征的响应 |
| 摘要点击 1984 全文点击 854 投稿时间：2020-03-24 修订日期：2020-05-15 |
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| 中文关键词 景观指数 河流水质 河岸缓冲区 空间尺度 多元统计分析 |
| 英文关键词 landscape metrics water quality riparian buffer zones spatial scale multivariate statistical analysis |
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| 中文摘要 |
| 基于密云水库上游北京境内白河段9个监测断面的水质数据，利用多元统计分析方法分析不同空间尺度（100、200、300、500和1000 m）河岸带缓冲区土地利用景观格局特征与水质总氮（TN）和总磷（TP）的关联性，识别水质对景观特征响应的最佳缓冲区尺度.结果表明，密云水库上游北京境内白河周边土地利用景观格局对水质的影响随着河岸缓冲区不同宽度的变化而不同，在河岸小尺度缓冲区表现得更明显，对水质TN和TP空间分异解释的最佳尺度分别为300 m和100 m河岸缓冲区.300 m缓冲区尺度，耕地斑块密度和草地聚集指数是影响河流TN的主要指数.100 m缓冲区尺度，城乡居民点面积比例对河流TP影响显著.该研究表明，优化河岸缓冲区300 m宽度范围内的景观格局，特别是耕地和林草地的合理配置提高农业景观的连通性和聚集度以及岸边城乡居民点面积与污染物排放控制，对于改善北京境内白河段河流水质的生态功能和保障密云水库饮用水安全十分重要. |
| 英文摘要 |
| Understanding the quantitative relationship between multi-scale landscape pattern and water quality is of important theoretical significance for rational landscape configuration and non-point source pollution control. Using water quality data at nine monitoring sites on the Baihe River in the upper reaches of the Miyun Reservoir in Beijing, a correlation analysis and a multiple stepwise regression were used to determine the effects of the landscape characteristics on the water quality at different riparian buffer zone scales (100, 200, 300, 500, and 1000 m). The results showed that the impact of the landscape pattern, composed of both landscape composition and configuration, on the surface water quality, varied significantly with spatial scales. The landscape characteristics for the 300 m and 100 m buffer zones appeared to have slightly greater effects on the water quality index TN and TP, respectively. The patch density of cultivated land and the aggregation index of grassland were recognized as the dominant indices influencing TN for the 300 m buffer zone. The area proportion of rural residential at the 100 m buffer zone was the dominant index influencing TP. It is very important to optimize the landscape pattern within a 300 m width of a riparian buffer zone. In particular, the reasonable allocation of cultivated land, forest, and grassland, to improve the connectivity and aggregation of agricultural landscapes, and the control of rural residential areas and pollutant discharge along the river bank, will enhance the ecological function of the water quality of the Baihe River in Beijing. This will ensure drinking water safety from the Miyun Reservoir. |
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