中文摘要：

赣江是鄱阳湖的最大支流，是鄱阳湖水污染物的主要来源，查明流域土地利用方式对赣江水质的影响和鄱阳湖的水环境保护具有重要意义。基于2012年对赣江7个主要支流NHI—N、TP、CODMn和DO浓度的每月测定结果，通过不同空间尺度和土地类型等级划分，利用相关分析和冗余分析研究土地利用方式对赣江流域河流水质的影响。研究结果表明，子流域的土地利用方式对TP的影响大于缓冲区；对COD Mn的影响在丰水期大于缓冲区，在枯水期小于缓冲区；对NH4^＋-N的影响在丰水期与缓冲区接近，在枯水期小于缓冲区；DO受土地利用方式的影响较小。水田中的丘陵水田是赣江水体TP和丰水期CODMn的主要来源；平原水田是枯水期CODMn的主要来源。居民建设用地中的城镇用地是赣江水体TP、NHI—N和丰水期CODMn的主要来源，农村用地是CODMn的主要来源。水域中的水库坑塘是赣江水体TP和丰水期NH4^＋-N、CODMn的主要来源。

英文摘要：

The global transition from undisturbed to human-dominated landscapes has impacted river water quality worldwide and made the quantification of land use a valuable indicator of water pollutant. The Ganjiang River, as the largest tributary of the Poyang Lake Basin, is the main pollution source of the Poyang Lake. Identifying the influence of land use on water quality in the Ganjiang River has great significance for water environment protection in the Poyang Lake. In this study, we investigated the monthly concentration of NH4^＋-N, TP, CODMn and DO in seven major tributaries of the Ganjiang River in 2012 and analyzed the influence of land use on river water quality by the methods of correlation analysis and redundancy analysis. Two spatial scales, the sub-basin and buffer zone, and two levels of land use classification were considered. The first level of land use classification was paddy field, dry farm, forest land, grass land, water area, resident construction land and unused land, resulting from remote sensing image interpretation. The second level of land use classification was obtained from the first level based on different geomorphology, canopy density, grass coverage and other factors. The results showed that forest was the largest land use pattern in the study area, followed by paddy field and dry farm. The concentration of TP had a significant positive correlation with NH4＋-N in wet season, while NH4＋-N had a significant negative correlation with DO in dry season. The pollution sources of TP both in wet season and dry season were from hill paddy field, urban land, reservoir and pond. The pollution sources of CODMn were from paddy field, urban land, reservoir and pond, and rural residential land in wet season, while from plain paddy field and rural residential land in dry season. The pollution sources of NH4^＋-N were from urban land, reservoir and pond in wet season, while from urban land, mountainous dry farm, riparian forest land and low coverage grassland in dry season. Additionally, different sp