农业源头流域景观异质性与溪流水质耦合关系

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Abstract This study was conducted in the Hujiashan catchment close to the Danjiangkou Reservoir. In consideration of landscape patterns at the catchment and 100m buffer scale, the relationships between landscape characteristics and spatiotemporal variations of stream water quality were explored by combining Spearman's rank correlation analysis, stepwise regression analysis and redundancy analysis. The results showed that the ranges of standardized coefficients of variation for ammonia nitrogen and total phosphorus were 69.8%~207.6% and 52.0%~146.1%, indicating the significant spatiotemporal variations. Cropland and residential land were the primary sources of stream water pollution, which explained 58.6% of variations of NH₃-N at 100m buffer scale. Landscape metrics including contagion, patch densities of forest and residential land, largest patch index of forest and residential land, and aggregation intensities of forest and cropland had significant effects on stream water quality (P<0.05). Landscape metrics in the whole catchment accounted for 71.1%~81.6% of total nitrogen and 74.5%~83.8% of total phosphorus, which performed better than those at the 100m buffer scale. All landscape metrics had the combined effects on the concentration of COD_Mn. Furthermore, stream water quality was significantly influenced by seasonal variations of landscape pattern. The variations of total nitrogen and total phosphorus in the dry season and ammonia nitrogen in the wet season could be better explained by landscape metrics.

Key words： stream water quality landscape metrics land use buffer zone linear regression models redundancy analysis

Received: 02 February 2016

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	XU Jian-feng
	YIN Win
	YAN Feng-ling
	SHI Zhi-hua

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XU Jian-feng,YIN Win,YAN Feng-ling等. The coupling relationship between landscape heterogeneity and stream water quality in an agricultural catchment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(10): 3193-3200.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I10/3193

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