Zhang Wei-Wei, Li Xiao-Na, Wang Chao, Zhao Chun-Qiao, Shi Rui-Shuang
Beijing Research&Development Center for Grass and Environment, Beijing Academy of Agriculture and Forest Science, Beijing 100097, China.
Huan Jing Ke Xue. 2020 Nov 8;41(11):4895-4904. doi: 10.13227/j.hjkx.202003250.
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.
了解多尺度景观格局与水质之间的定量关系，对于合理进行景观配置和控制面源污染具有重要的理论意义。利用北京密云水库上游白河9个监测点的水质数据，通过相关性分析和多元逐步回归，确定了不同河岸缓冲带尺度（100、200、300、500和1000米）下景观特征对水质的影响。结果表明，由景观组成和格局构成的景观格局对地表水水质的影响随空间尺度变化显著。300米和100米缓冲带的景观特征分别对水质指标总氮（TN）和总磷（TP）影响稍大。耕地斑块密度和草地聚集度是影响300米缓冲带总氮的主导指标。100米缓冲带农村居民点面积比例是影响总磷的主导指标。优化河岸缓冲带300米宽度范围内的景观格局非常重要。特别是合理配置耕地、森林和草地，提高农业景观的连通性和聚集度，控制农村居民点及河岸污染物排放，将增强北京白河水质的生态功能。这将确保密云水库饮用水安全。
