黑河沉积物氮、磷和有机质的空间分布特征及来源解析

Spatial Distribution Features and Origin Analysis of Nitrogen,Phosphorus and Organic Matter in Heihe River Sediments

【目的】研究黑河流域沉积物营养盐空间分布特征及对其来源进行解析。【方法】采用多元线性回归模型和冗余分析方法定量分析了不同缓冲区尺度土地利用类型对营养盐的解释度及对其变异的解释能力。【结果】黑河流域沉积物的总磷(TP)、总氮(TN)、硝态氮(NO_(3)^(-)N)、氨态氮(NH_(3)^(-)N)和有机碳(TOC)含量均值分别为224.83、245.32、55.76、30.25和8.42 mg/kg。从空间分别来看,总氮(TN)、总磷(TP)在中游自然河段的含量较高,在上游支流河段的含量较低;各尺度土地利用类型与沉积物营养含量密切相关。【结论】本研究阐明了建设用地、灌丛是黑河流域沉积物有机碳(TOC)、硝态氮(NO_(3)^(-)N)的主要来源。这可为该流域的生态环境保护与治理提供参考。

【Objective】In order to study the spatial distribution features of sediment nutrients and an-alyze the pollution organics in Heihe River Basin.【Method】The Multivariable linear regression model and Redundancy analysis method were used to quantitatively analyze the explanatory degree of nutrients and the explanatory ability of variation of land use types at different buffer scales.【Result】The average contents of TP,TN,NO_(3)^(-)N,NH_(3)^(-)N and TOC in sediments of Heihe River Basin were 224.83,245.32,55.76,30.25 and 8.42 mg/kg.It showed that the contents of TN and TP were higher in the natural reaches of the middle reaches,but lower in the natural reaches of the upper reaches.Land use types at all scales are closely related to sediment nutrient content.【Conclusion】This study clarifies the building land and shrub land are the main sources of TOC and NO_(3)^(-)N in sediments of the Heihe River Basin,which can provide reference for the ecological environment protection and management of Heihe River Basin.