【摘要】 首先选取巢湖流域内的7个二级流域作为研究区,同时为了使研究结果更具可靠性,利用县级行政区划数据对研究区进行细化;然后构建泥沙输移分布模型,定量估算2015年巢湖流域颗粒态磷负荷模数;最后在不同土地利用模式下,综合考虑地理位置、资源条件、社会经济等影响因子,剖析产生颗粒态磷流失的差异并分析其原因。结果表明:巢湖流域平均颗粒态磷负荷模数为0.308 t·km^-2·a^-1,主要用地类型为林地0.759 t·km^-2·a^-1>耕地0.256 t·km^-2·a^-1>建设用地0.138 t·km^-2·a^-1,细分研究区使研究结果更具可靠性。颗粒态磷负荷模数具有空间差异,高值区集中在坡度较大、降水充沛的杭埠河流域（岳西县、霍山县、舒城县）;低值区分布在地势平缓、经济发展水平较高的派河流域（肥西县）、南淝河流域（合肥市、长丰县）。坡度大、降水丰沛是造成林地、耕地颗粒态磷负荷模数较高的主要原因;化肥、农药不合理施用、地膜污染等导致耕地负荷较高;畜禽养殖提高建设用地负荷;磷矿的分布也会增加磷背景值。更多还原

【Abstract】 In this study, we selected seven sub-basins of the Chaohu Basin as the target area. Furthermore, county-level administrative division data were used to refine the units of the study area to ensure more reliable results. A sediment delivery distribution model was then established to quantitatively estimate the particulate phosphorus loading modules（PPLM）of the Chaohu Basin in 2015. Finally, multiple factors, including the geographical location, resource conditions, and socio-economic indicators, are comprehensively integrated to determine the differences in the loss of particulate phosphorus and their causes under different land use patterns. The main conclusions are as follows:The average PPLM of the entire Chaohu Basin is 0.308 t·km^-2·a^-1, while, among the different land-use types, the lowest level is observed in construction land(0.138 t·km^-2·a^-1), which is lower than that of woodland(0.759 t·km^-2·a^-1)and cultivated land(0.256 t·km^-2·a^-1). This differs from previous studies, demonstrating that subdividing the research units can improve the reliability of the results. There are spatial differences in PPLM. High-value areas are concentrated in the Hangbu River Basin（Yuexi, Huoshan, and Shucheng counties）,with steep slopes and abundant rainfall, while low-value regions are distributed in the flat terrain and developed economic basins, such as the Paihe（Feixi County）and Nanfei River basins（Hefei City and Changfeng County）. Steep slopes and abundant rainfall could be the main reasons for the higher PPLM in woodland and cultivated land, and the unsustainable use of chemical fertilizers, pesticides, and plastic film pollution have led to higher arable land loadings. In addition, the breeding of livestock and poultry increases the loadings of construction land, and the distribution of phosphorite also increased the background phosphorus values.更多还原