中文摘要：

分别于枯水期和丰水期在东江流域包括干流和支流在内的100个站点实测河水的电导率及相关离子浓度，据此讨论了河水电导率的形成机制．结果表明，东江流域枯水期（1月份）河水电导率均值为85．3μS／cm，丰水期（7月份）河水电导率均值为87．7μS／cm。东江流域河水电导率（离子浓度）主要来自地表岩百和矿物的化学风化过程，人类活动对东江河水电导率的干扰较为明显，同时大气海盐沉降过程对东江河水电导率也产生一定程度的影响。运用非参数统计和空间分析等手段处理原始数据，定量地发现流域岩性、地貌、土壤、植被和人类活动等因素对河水电导率均具有大小不同的贡献。

英文摘要：

Based on the hydrochemical data of water samples from the Dongjiang River Basin in dry and wet seasons, the mechanism of river electrical conductivity （EC） is considered. The results show that EC in the Dongjiang River Basin is 85.3 μS/cm in January and 87.7 μS/cm in July. The share of weathe- ring conductivity （ Cw ）, seasalt conductivity （C） and anthropogenic conductivity （ Ch ） is 46.4%, 19.6% and 33.9% respectively. It indicates that chemical weathering is the main contributing factor for EC in the Dongjiang River Basin. The humanity interference cannot be neglected, while the seasalt set- tlement has certain effects on the hydrochemistry. Furthermore, the nonparametric statistics methods and spatial analysis are used to prove that the geographic features （lithology, landform, soil, vegetation and human activities） have played an important role in the EC mechanism.