广西速生桉树种植区水库水化学特征及其氮来源研究

Studies on Hydrochemical Characteristics and Nitrogen Sources of Reservoirs in Fast-growing Eucalyptus Plantation Region of Guangxi

研究了广西境内速生桉树林区有代表性的3个水库库水的化学特征及氮素来源。结果表明：双龙水库的水化学类型为重碳酸-钠型,秋风麓水库和公净水库的水化学类型均为重碳酸-钙型;双龙水库的水质以Ⅱ类为主,秋风麓水库的水质以Ⅲ~Ⅳ类为主,公净水库的水质以Ⅳ~Ⅴ类为主;双龙水库库水中氮素来源于大气降水和施用的化学肥料,秋风麓水库库水中氮素主要来源于化学肥料,公净水库库水的氮素来源于大气降水、化学肥料（2013年）以及生活污水和动物粪便（2014年）。

We studied the hydrochemical characteristics and nitrogen sources of 3 representative reservoirs in fast-growing eu- calyptus plantation region of Guangxi. The results showed that the hydrochemical type of Shuanglong reservoir was HCO3--Na type, while that of both Qiufenglu reservoir and Gongjing reservoir was HCO3--Ca type. The water quality type of Shuanglong reservoir was mainly Ⅱ type, that of Qiufenglu reservoir was mainly Ⅲ~Ⅳtype, while that of Gongjing reservoir was mainly Ⅳ-Ⅴ type. The nitrogen in the water of Shuanglong reservoir mainly came from atmospheric precipitation and chemical fertilizer application; the ni- trogen in the water of Qiufenglu reservoir was mainly derived from chemical fertilizer application; while that in the water of Gongjing reservoir mainly came from atmospheric precipitation, chemical fertilizer application （in 2013）, sanitary sewage and animal waste （ in 2014）.