摘要
在鄱阳湖乐安江子流域设立了17个水质采样点,通过实验室测量获得2010年10月—2011年8月河流水体总磷（TP）的浓度数据.数据分析结合模型模拟得出以下结论：监测期内,流域内河流水体TP浓度变化范围为0.024 2~0.358 4 mg/L,水质情况春季最好,秋冬季其次,夏季最差.夏季河流水体TP浓度总体上由上游至下游逐渐增加,其他季节空间上无明显变化规律.降雨径流是TP输出的主要驱动因素,河流水体TP浓度与降雨量变化趋势一致.汛期河流水体TP浓度与土地利用类型的统计模型显示,河流水体TP浓度与耕地和城乡用地面积占流域总面积的比例呈正相关关系,与林地和草地面积占流域总面积的比例呈负相关关系;其中,河流水体TP浓度对耕地、城乡用地及林地面积的变化更为敏感.
17 water quality monitoring sites were established along Le＇an River, one of the tributa- ries of Poyang Lake Basin. Streamwater TP （total phosphorus） concentrations were analyzed in la- boratory from October, 2010 to August, 2011. Based on data analysis combined with model simula- tion, the following results were obtai.ned. During the entire monitoring period, streamwater TP con- centrations were in the range of 0. 024 2 to 0. 358 4 mg/L. Water quality in spring was the best, fol- lowed with autumn and winter, and summer was the worst. In summer, streamwater TP concentra- tions increased gradually from upstream to downstream, while there were no obvious variation trends in other seasons. Rainfall-runoff was the main driver of TP emission. Streamwater TP concentrations followed similar trends as rainfall. The outcomes of the statistical model between streamwater TP concentrations and land use types during wet season showed that streamwater TP concentration was positively correlated with the proportions of arable land, urban and rural areas to the total area of the basin, while negatively correlated with the proportions of forest area and grassland. Meanwhile, streamwater TP concentration was more sensitive to the changes of arable land, urban and rural land as well as forest areas.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第4期805-810,共6页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(41371062)
江西省重大生态安全问题监控协同创新中心资助项目(JXS-EW-00)
南京地理与湖泊研究所"一三五"战略发展资助项目(NIGLAS2012135001)
关键词
非点源磷输移
时空变化
影响因素
乐安江
鄱阳湖
non-point phosphorous leaching
spatial and temporal variations
influential factors
Le＇an River
Poyang Lake
